MARUYAMA,Toru - Faculty of Chemistry, Materials and Bioengineering Department of Chemistry and Materials Engineering

MARUYAMA, Toru

Faculty, Department/Institute

Faculty of Chemistry, Materials and Bioengineering Department of Chemistry and Materials Engineering

Academic status (qualification)

Professor Apr. 1,2014

Undergraduate Degrees・University

Muroran Institute of Technology Faculty of EngineeringDepartment of material science and engineering 1995 Graduated

Graduate Degrees・University

Hokkaido University Doctor's Degree Program Materials science and engineering 2000 Completed
Muroran Institute of Technology Master's Degree Program Materials Science and Technology 1997 Completed

Academic Degrees

Doctor of Philosophy Mar. 2000 Hokkaido University

Homepage Address, E-mail Address

Homepage Address：https://wps.itc.kansai-u.ac.jp/melt/
E-mail Address：tmaru@kansai-u.ac.jp

Research fields

Research fields	keyword
Casting
Iron and steel materials
Metal making engineering
Surface treatment
Metal structure

Research topics

research topic	Study on Transition from delta Dendrite to Austenite Grain for Carbon Steel.
Study theme state	Individual Research
research duration
Research Programs
keyword	Carbon Steel,Solidification,Austenite Grain
Research field	Iron and steel materials
Research Topics Overview

research topic
Study theme state	Individual Research
research duration
Research Programs
keyword
Research field	Surface treatment
Research Topics Overview

research topic	The study on thermal decomposition promotion of the foaming model and ventilation rate improvement of the coat in the evaporative pattern casting.
Study theme state	Individual Research
research duration
Research Programs
keyword	evaporative pattern,casting foaming,model coat
Research field	Casting
Research Topics Overview

research topic	The development of the Pb free copper alloy.
Study theme state	Joint research within Japan
research duration
Research Programs
keyword	copper alloy,Pb free
Research field
Research Topics Overview

research topic
Study theme state
research duration
Research Programs
keyword	sphrodal graphite cast iron,graphite nucleation
Research field
Research Topics Overview

Research Activities

(1)1995-1996 Graduate School at Muroran Institute of Technology -Study on recycling of steel (Copper removal in molten steel) (2)1997-1999 Graduate School at Hokkaido University-Study on grain formation and solidification for steel (peritectic solidification, Austenite grain formation) (3)2000-　Kansai University -Evaporative pattern casting process (molten metal flow, thermal decomposition) -Alloy design of cast iron, steel, copper alloy and high entropy alloy -Study on mold for casting (green sand, water glass system mold, organic self hardening mold) -Thermal analysis for casting -Fire refining -Blasting for thermal spraying

Awards

Encouragement prize Jan. 24,1997(Hokkaido Branch of The Iron and Steel Institute of Japan)
The 18th Encouragement priz Jun. 16,2001(Kansai Branch of Japan Foundrymen's Society)
Encouragement prize Jun. 26,2001(Japan Thermal Spraying Society)
The 23th Encouragement prize Jun. 17,2006(Kansai Branch of Japan Foundrymen's Society)
Jun. 18,2008
Mar. 31,2009
May 22,2010
May 22,2010
Jun. 14,2010
Jun. 14,2010
May 28,2011
Apr. 20,2012
Nov. 25,2013

Academic Associations

所属学会・団体名	役職名 (役職在任期間)
The Iron and Steel Institute of Japan
The Japan Institute of Metals
Japan Foundry Engineering Society
Japan Thermal Spraying Society	20130600()
Japan Institute of Copper

Intellectual Property Rights

(Published)
application number：2001-346584 (Nov. 12,2001)
application number：2003-147460 (May 21,2003)
(Acquired)
application number：2002-055007 (Feb. 28,2002)
application number：2003-253358 (Sep. 10,2003)
application number：3789833
(Acquired)
application number：2002-055008 (Feb. 28,2002)
application number：2003-253359 (Sep. 10,2003)
application number：3801518
(Published)
application number：2004-175160 (Jun. 14,2004)
application number：2005-350753 (Dec. 22,2005)
(Acquired)
application number：2004-176459 (Jun. 15,2004)
application number：2006-000933 (Jan. 5,2006)
application number：4452564
(Acquired)
application number：2004-344541 (Nov. 29,2004)
application number：2006-152373 (Jun. 15,2006)
application number：3957308
(Published)
application number：2006-126666 (Apr. 28,2006)
application number：2007-297675 (Nov. 15,2007)
(Published)
Copper alloy for sliding maerial which has excellent bearing properties application number：2007-550329 (Apr. 26,2007)
application number：WO2007/126006 (Nov. 8,2007)
(Acquired)
application number：2007-337872 (Nov. 28,2007)
application number：2009-132986 (Jun. 18,2009)
application number：5201444
(Acquired)
application number：2008-268822 (Oct. 17,2008)
application number：2010-031347 (Feb. 12,2010)
application number：4806823
(Acquired)
application number：2009-100355 (Mar. 24,2009)
application number：2010-150649 (Jul. 8,2010)
application number：4658269
(Acquired)
Lead-free copper alloy for casting with excellent mechanical properties application number：2009-126918 (May 26,2009)
application number：WO2010/137483 (Dec. 9,2010)
application number：5335558
(Published)
application number：2012-511684 (Apr. 20,2011)
application number：WO2011/132703 (Oct. 27,2011)
(Acquired)
application number：2010-076129 (Mar. 29,2010)
application number：2011-208205 (Oct. 20,2011)

Joint Projects/Commissioned Projects

2006 - 2007

Research Publications

No.	Type of publication	Date of publication (Date of presentation)	Title	Type of research result	Jointly authored or single authored	Publisher and journal name	Volume number
1	Papers1	2022/12/25～2022,12,25,,,	Influence of Gas Replacement in Foamed Pattern on Pattern Decomposition and Mold Filling Rate in Evaporative Pattern Casting Process of Iron Castings	Academic Journal	Single-Author	Journal of Japan Foundry Engineering Society	Vol.94 No.12 Page.748-754
2	Papers1	2022/9/25～2022,09,25,,,	Influence of carbon solid solution on mechanical properties and microstructures on (MnFeCoNi)89Cu11 high-entropy alloys	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.94 No.9 Page.536-541
3	Papers1	2022/6/25～2022,06,25,,,	X-Ray Transmission Observation of Mold Filling Behavior Immediately After Pouring in Cast Iron Full-Mold	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.94 No.6 Page.277-281
4	Commentary9	2021/9/25～2021,09,25,,,	Technical Review on Special Molding System for Energy Saving and Environmental Conservation	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.93 No.9 Page.562-568
5	Papers1	2021/6～2021,06,00,,,	Influence of flow rate of test solution on erosion-corrosion resistance of lead-free copper alloys in jet-in-slit test	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.93 No.6 Page.323-330
6	Academic presentation7	2021/5～2021,05,00,,,	STEM Characterization of Cu distribution in Cu-added spheroidal graphite cast iron	Academic Journal	Co-author	Reports of the 177th JFS Meeting	Vol.177th, Page. 5
7	Commentary9	2021/4/30～2021,04,30,,,	Blasting Treatment	Academic Journal	Single-Author		Vol.58 No.2 Page.65-70
8	Papers1	2020/8～2020,08,00,,,	Influence of Cu2+ and Cl- on Corrosion of Cu Alloys in Chloride Aqueous Solutions	Academic Journal	Co-author	Journal of Japan Institute of Copper	59(2020), pp.161-166
9	Research report21	2020/5～2020,05,00,,,	Space Saving for Water Meter by Development of Manufacturing Technology of Lead-Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.92, No.5 (2020), pp.237-242
10	Commentary9	2020/4～2020,04,00,,,	High-entropy Steel and High-entropy Cast Iron	Academic Journal	Co-author	Bulletin of The Iro and Steel Institute of Japan	25(2020), No.4, pp.218-227
11	Papers1	2020/2～2020,02,00,,,	Measuring the interfacial heat transfer coefficient between flowing molten alloy and sand mold using fluidity tests	Academic Journal	Co-author	Journal of Materials Processing Technology	Vol. 276 (2020) 116394
12	Papers1	2019/11～2019,11,00,,,	Corrosion Behavior of Pb-Free Copper Alloys Immersed in Chloride Aqueous Solution	Academic Journal	Co-author	J. Japan Inst. Metar.	Vol.83, No.11, pp.416-423
13	Papers1	2019/10～2019,10,00,,,	Microstructural, mechanical, and corrosion properties of plasma-nitrided CoCrFeMnNi high-entropy alloys	Academic Journal	Co-author	Surface and Coatings Technology	Vol.376 (2019), pp.52-58
14	Papers1	2019/8～2019,08,00,,,	Electron Microscopy on Cu Element Distribution in Spheroidal Graphite Cast Iron	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol.91, No.8 (2019), pp.512-520
15	Papers1	2019/7～2019,07,00,,,	Effect of Molten Metal Temperature on Mold Filling in Evaporative Pattern Casting	Academic Journal	Co-author	International Journal of Metalcasting	Vol.13, Issue 3 (2019), pp.611-617
16	Papers1	2019/7～2019,07,00,,,	Influence of Tellurium Addition to Spheroidal Graphite Cast Iron on the Number of Graphite Particles	Academic Journal	Co-author	International Journal of Metalcasting	Vol.13, Issue 3 (2019), pp.571-577
17	Papers1	2018/3～2018,03,00,,,	Evaluation on erosion-corrosion resistance of sulfide-dispersed lead-free copper alloy by the jet-in-slit test	Academic Journal	Co-author	Rust Prevention & Control Japan
18	Papers1	2017/8/1～2017,08,01,,,	Cathodic Decomposition Reaction of Cu2S in Sulfide-Dispersed Pb-Free Copper Alloy	Academic Journal	Co-author
19	Commentary9	2017/8～2017,08,00,,,	Tribology of Lead-Free Copper Alloy Castings	Academic Journal	Co-author
20	Papers1	2017/1～2017,01,00,,,	Effect of Coating Thickness on the Molten Metal Filling Rate of Cast Iron in the Evaporative Pattern Casting Process	Academic Journal	Co-author	International Journal of Metalcasting	Vol. 11, p. 77-83
21	International academic conference8	2016/5/23～2016,05,23,,,	Effect of coating thickness on Melt Filling Rate of Cast Iron in Evaporative Pattern Casting Process	Other	Co-author	Proceedings of the 72nd World Foundry Congress
22	Papers1	2015/12～2015,12,00,,,	Influence of Phosphorus on Mechanical Properties, Fluidity and Pressure Toughness of Lead Free Bronze Castings with Dispersed Sulfide Particles	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	87(2015), 849-854
23	Academic presentation7	2015/11/12～2015,11,12,,,	Influence of phosphorus on the solidification temperature of nickel-base self-fluxing alloy	Other	Co-author
24	Academic presentation7	2015/11/12～2015,11,12,,,	Corrosion resistance of Zn-Ti pseudo alloy spraying	Other	Co-author
25	Papers1	2015/8/1～2015,08,01,,,	Corrosion Properties of Sulfide-Dispersed Lead-Free Bronze Castings by Electrochemical Polarization Method	Academic Journal	Co-author	Journal of Japan Institute of Copper	54(2015), 113-118
26	Papers1	2014/11～2014,11,00,,,	Effect of amount of products suspended in melt after spheroidizing treatment on graphite nodule count in spheroidal graphite cast iron	Academic Journal	Single-Author
27	Papers1	2014/8/1～2014,08,01,,,	Preparation of Lead-Free Machinable Brass dispersed MnS by Hot Extrusion of Machined Chips	Academic Journal	Co-author
28	Papers1	2014/8/1～2014,08,01,,,	Effect of temperature of solution and aging heat treatment on hardness of Cu-Zn-Ni-Mn system alloy	Academic Journal	Co-author	Journal of Japan Institute of Copper	53(2014), 78-82
29	Papers1	2014/1/25～2014,01,25,,,	Effect of Cooling Rate and Dissolved Oxygen Content on Sulfide Morphology in Cu-Sn-Zn-S Alloy Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol. 86, No. 1, p. 26-30
30	International academic conference8	2013/9/7～2013,09,07,,,	Effect of chemical composition on spheroidizing of sulfide in lead free bronze with dispersed sulfide particles	Other		The 4th Korea-Japan Conference for Young Foundry Engineers
31	International academic conference8	2013/8/23～2013,08,23,,,	Effect of melt temperature on formation of liquefied resin produced by thermal decomposition during evaporative pattern casting	Other		The 8th International Symposium in Science & Technology
32	International academic conference8	2013/8/23～2013,08,23,,,	Effect of coating permeability and coating thickness on melt flow rate in evaporative pattern casting	Other		The 8th International Symposium in Science & Technology
33	International academic conference8	2013/8/8～2013,08,08,,,	The effect of cooling rate on dendrite arm spacing of the lead free bronze with dispersed sulfide particles	Academic Journal		8th Pacific Rim International Congress on Advanced Materials and Processing
34	International academic conference8	2013/8/7～2013,08,07,,,	Effect of Monotectic Reaction on Solidification Cracking Resistance of Lead Free Bronze	Academic Journal		8th Pacific Rim International Congress on Advanced Materials and Processing
35	Papers1	2013/4/30～2013,04,30,,,	Effect of Work Hardening of Substrate Surface on Adhesion of Zinc Alloy Sprayed Coatings	Academic Journal	Co-author	Journal of Japan Thermal Spray Society	Vol. 50, No. 2, p. 64-67
36	International academic conference8	2012/8/30～2012,08,30,,,	Development of lead free bronzefor permanent mold casting process	Other		The 7th International Symposium in Science & Technology
37	International academic conference8	2012/8/30～2012,08,30,,,	The effect of temperature in thermal decomposition gas gap on the melt flow rate in evaporative pattern casting	Other		The 7th International Symposium in Science & Technology
38	International academic conference8	2012/8/30～2012,08,30,,,	Development of high strength large castings of carbon steel with variety of micro-alloy	Other		The 7th International Symposium in Science & Technology
39	International academic conference8	2012/8/30～2012,08,30,,,	The effect of work hardening of substrate surface on adhesion of the zinc alloy sprayed coating	Other		The 7th International Symposium in Science & Technology
40	Papers1	2012/7/5～2012,07,05,,,	Solidification Cracking Resistance in Permanent Mold Casting Process for Sulfide Dispersed Lead Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol. 84, No. 7, p. 383-388
41	International academic conference8	2012/5/23～2012,05,23,,,	Evaluation of Sprayed Coatings by Electrical Method	Academic Journal	Co-author	Proceedings of International Thermal Spray conference 2012	708-7011
42	International academic conference8	2012/5/22～2012,05,22,,,	Adhesion Properties of Sprayed Coatings on Substrate Blasted by Multiangle Blasting	Academic Journal	Co-author	Proceedings of International Thermal Spray conference 2011	758-762
43	International academic conference8	2012/4/27～2012,04,27,,,	Applicability of Permanent Mold Casting for Lead Free Bronze with Sulfide Dispersion	Academic Journal	Co-author	Proceedings of 70th World Foundry Congress
44	Papers1	2012/3/20～2012,03,20,,,	EFFECT OF NITRIDING PARAMETER ON ACTIVE SCREEN PLASMA NITRIDING RESPONSE OF SACM645 STEEL	In-house publication	Co-author	Sci Technol Rep Kansai Univ	No.54 Page.183-190
45	Papers1	2012/2～2012,02,00,,,	Influence of Alloying Elements on Sulfide Formation in Lead Free Bronze Castings with dispersed sulfide particles	Academic Journal	Co-author	Mater Trans	Vol.53 No.2 Page.380-384
46	International academic conference8	2011/11/10～2011/11/112011,11,10,2011,11,11	Gas Temperature in Thermal Decomposition Gas Gap on Evaporative Pattern Casting	Other	Co-author	Proceedings of the 4th Korea-Japan Conference for Young Foundry Engineers
47	International academic conference8	2011/9/26～2011/9/292011,09,26,2011,09,29	Effect of hardness in blasted substrate surface on adhesive strength of sprayed coatings	Academic Journal	Co-author	Proceedings of International Thermal Spray conference 2011
48	Papers1	2011/9/25～2011,09,25,,,	Improvement of Frictional Wear Property of Lead-free Bronze Castings by Lamellar Eutectoid Structure	Academic Journal	Co-author
49	Commentary9	2011/8/31～2011,08,31,,,	Surface State of Substrate and Adhesion of Thermal Sprayed Coatings	Other	Co-author
50	International academic conference8	2011/6/29～2011/7/12011,06,29,2011,07,01	Lead Free Bronze Castings with Sulfide Dispersion for Water Supply Products	Academic Journal	Co-author	Newcast Forum
51	International academic conference8	2011/6/26～2011/6/292011,06,26,2011,06,29	Characteristic of Permanent Mold Casting for Sulfide Dispersed Lead Free Bronze	Academic Journal	Co-author	Eoropean Metallurgical Conference 2011
52	Papers1	2011/2～2011,02,00,,,	摩擦材料用鉛フリー青銅合金の焼結とトライボロジー特性	Academic Journal	Co-author
53	International academic conference8	2010/10/16～2010/10/202010,10,16,2010,10,20	Alloy Designing and Properties of Sulfide Dispersed Lead Free Bronze Castings	Academic Journal	Co-author	Proceedings of 69th World Foundry Congress	278-282
54	Papers1	2010/8/1～2010,08,01,,,	Degassing and Deoxidation Reaction in Casting for Cupronickel	Academic Journal	Co-author
55	International academic conference8	2010/5/3～2010/5/52010,05,03,2010,05,05	Effect of Blasting Angle and Blasting Time on the Amount of Residual Grit blasted on Steel Substrate and Adhesive Property of Sprayed Coating
56	Papers1	2009/12/25～2009,12,25,,,	Structure Control and Characteristics of Solidification on Sulfide Dispersed Lead-Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society
57	Papers1	2009/12/25～2009,12,25,,,	Castability and Cutting Conditions of Sulfide Dispersed Lead Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society
58	Papers1	2009/12/25～2009,12,25,,,	Casting Structure, Mechanical Properties and Machinability with Changes in Amount of Alloyed Elements of Sulfide Dispersed Lead Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society
59	Papers1	2009/12/25～2009,12,25,,,	Casting Structure, Mechanical Properties and Machinability with Changes in Amount of Alloyed Elements of Sulfide Dispersed Lead Free Bronze Castings	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society
60	International academic conference8	2009/10/21～2009/10/242009,10,21,2009,10,24	Effect of Blasting Time and Residual Grit on Adhesion of Thermal Sprayed Coating
61	International academic conference8	2009/6/1～2009/6/32009,06,01,2009,06,03	Sulfide Dispersed Lead Free Copper Alloy Castings	Academic Journal	Co-author	Proceedings of 46th Czech Foundry Days	1-9
62	Papers1	2008/5～2008,05,00,,,	Some Properties of Sulfide Dispersed Lead Free Copper Alloy Castings	Academic Journal	Co-author	Transactions of American Foundry Society	116, 299-307
63	Papers1	2008/5～2008,05,00,,,	Temperature Measurement in Thermal Decomposition Gas Gap on Evaporative Pattern Casting of Cast Iron	Academic Journal	Co-author	Transactions of American Foundry Society	933-942
64	International academic conference8	2008/5～2008,05,00,,,	Machining C87850 (PANEL, Topic : Sulfide Dispersed Copper Alloy Castings)	Academic Journal	Co-author		No.08-169
65	International academic conference8	2008/5～2008,05,00,,,	Effect of the Blasting Time on the Amount of the Residual Grit on Blasted Steel Substrates	Academic Journal	Co-author		691-695
66	International academic conference8	2007～2007,00,00,,,	Effect of the blasting angle on the amount of the residual grit on blasted substrates	Academic Journal	Co-author
67	International academic conference8	2007～2007,00,00,,,	Preparation and Properties of Lead Free Copper Alloy Castings with Dispersed Sulfide Particles	Academic Journal	Co-author
68	International academic conference8	2007～2007,00,00,,,	Effect of Zn Contents on Properties of Sulfide Dispersed Lead Free Copper Alloy Castings	Academic Journal	Co-author
69	Papers1	2006/12～2006,12,00,,,	Effects of Blasting Parameters on Removability of Residual Grit	Academic Journal	Co-author	J. Thermal Spray Technology	15, 817－821.
70	Papers1	2006/7/20～2006,07,20,,,	A spray coating and its mechanical properties of Al－Si－Zn alloy produced by the spray forming process	Academic Journal	Co-author	Materials Transactions	47（7）， 1853－1858
71	International academic conference8	2006～2006,00,00,,,	Effects of blasting parameters on removability of residual grit	Academic Journal	Co-author
72	Papers1	2005/8/1～2005,08,01,,,	Effect of Sn addition contents and cooling rate on Zinc equivalent of Sn on Cu-Zn Alloy	Academic Journal	Co-author	Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies	Vol. 44 p. 56-61
73	Papers1	2005/8/1～2005,08,01,,,	Effect of Ni addition contents and cooling rate on Zinc equivalent of Ni on Cu-Zn Alloy	Academic Journal	Co-author	Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies	Vol. 44 p. 62-67
74	International academic conference8	2005～2005,00,00,,,	Residual grit on the substrate surface in roughening treatment	Academic Journal	Co-author
75	International academic conference8	2005～2005,00,00,,,	Shape of cast iron melt surface and pattern decomposition surface in evaporative pattern casting by using coating of various permeability	Academic Journal	Co-author
76	Papers1	2004/8/2～2004,08,02,,,	Effect of Cooling rate on beta Phase Fraction of Cu-Zn Alloy	Academic Journal	Co-author	Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies	Vol. 43 p. 31-35
77	Papers1	2004/8/2～2004,08,02,,,	Effect of Si Content and Cooling Rate on beta Phase Fraction in Cu-Zn Alloy	Academic Journal	Co-author	Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies	Vol. 43 p. 36-41
78	International academic conference8	2004～2004,00,00,,,	Influence of substrate surface roughness on adhesive property of sprayed coating	Academic Journal	Co-author
79	Papers1	2003/12/20～2003,12,20,,,	Characterization of Pure Aluminum and Zinc Sprayed Coatings Produced by Flame Spraying	Academic Journal	Co-author	MATERIALS TRANSACTIONS	VOL.44 No.12
80	Papers1	2003/11/20～2003,11,20,,,	Thermal Decomposition Behavior of Expandable Pattern Including Blended Metal or Alloy Powder in Evaporative Pattern Casting Process of Cast Iron	Academic Journal	Co-author	MATERIALS TRANSACTIONS	VOL.44 NO.11
81	Papers1	2003/11/20～2003,11,20,,,	Thermal Decomposition Behavior of Expandable Pattern Including Blended Metal or Metal Oxide Powder in Evaporative Pattern Casting of Al-Si System Alloy	Academic Journal	Co-author	MATERIALS TRANSACTIONS	VOL.44 NO.11
82	Papers1	2003/8/1～2003,08,01,,,	Machinability of Pb free Cu-Zn system alloy in which Si system compound dispersed	Academic Journal	Co-author
83	Papers1	2003/8/1～2003,08,01,,,	Influence of zinc vapor pressure on disperse composite of fine graphite particle in Cu-Zn system alloy	Academic Journal	Co-author
84	Papers1	2003/8/1～2003,08,01,,,	Structure and machinability on hot extrusion material of Pb free Cu-Zn system alloy which dispersed fine graphite particles	Academic Journal	Co-author
85	Papers1	2003/5/20～2003,05,20,,,	Sliding Properties of Composite Sprayed Coating between Bronze Powder and Solid Lubricant	Academic Journal	Co-author	MATERIALS TRANSACTIONS	Vol. 44 No.5 Page 1024-1028
86	Papers1	2003/2/25～2003,02,25,,,	Carbon pickup phenomenon of Fe-C system alloys in the evaporative pattern casting process	Academic Journal	Co-author	Journal of Japan Foundry Engineering Society	Vol. 75, No.2, Page 130-136
87	Papers1	2002/10/31～2002,10,31,,,	Surface conditions of substrate and adhesive property of sprayed coating	Academic Journal	Co-author	Journal of Japan Thermal Spraying Society	Vol. 39, No.4, Page 144-149
88	Papers1	2000/2/1～2000,02,01,,,	Effects of Carbon and Ferrite-stabilizing Elements on Austenite Grain Formation for Hypo-peritectic Carbon Steel	Academic Journal	Co-author	Tetsu-to-Hagane
89	Papers1	2000～2000,00,00,,,	Formation of austenite grain in hypo-peritectic carbon steels.	Academic Journal	Co-author
90	Academic presentation7	1999/9/1～1999,09,01,,,	Effect of Solute Elements on the Formation of Austenite Grain for Hypo-Peritectic Steel.	Academic Journal	Co-author
91	Papers1	1999/8～1999,08,00,,,	Peritectic Transformation and Austenite Grain Formation for Hyper-peritectic Carbon Steel	Academic Journal	Co-author	Tetsu-to-Hagane
92	Academic presentation7	1998/9～1998,09,00,,,	Transition from delta Dendrite to Austenite Grain for Peritectic Steel.	Academic Journal	Co-author
93	Papers1	1998/4/1～1998,04,01,,,	Evaporation Rate of Copper from Molten Iron by Urea Spraying under Reduced Pressure	Academic Journal	Co-author	Tetsu-to-Hagane
94	Academic presentation7	1998/3～1998,03,00,,,	Development of Austenite Grain for Hyper-Peritectic Carbon Steel.	Academic Journal	Co-author
95	Papers1	1998/2/1～1998,02,01,,,	Accelerative Evaporation Mechanism of Molten Pure Copper and High Carbon Iron by Urea Addition	Academic Journal	Co-author	Testu-to-Hagane
96	Academic presentation7	1997/9～1997,09,00,,,	Evaporation Rate of Copper from Liquid Iron by Urea Spraying under Reduced Pressure.	Academic Journal	Co-author
97	Academic presentation7	1997/3～1997,03,00,,,	Accelerative Evaporation of Copper from Molten Steel by Urea Spraying under Reduced Pressure.	Academic Journal	Co-author
98	Academic presentation7	1995/11～1995,11,00,,,	Evaporation Behavior of Molten Copper and Pig Iron by Urea Additon.	Academic Journal	Co-author

Academic presentationUnrefereedAcademic JournalSingle-AuthorMARUYAMA,ToruVol.181st Page.402023/5/10～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.181_40

PapersInfluence of Gas Replacement in Foamed Pattern on Pattern Decomposition and Mold Filling Rate in Evaporative Pattern Casting Process of Iron CastingsIn refereedAcademic JournalSingle-AuthorMARUYAMA,ToruJournal of Japan Foundry Engineering SocietyVol.94 No.12 Page.748-7542022/12/25～Japan Foundry Engineering SocietyJapanese10.11279/jfes.94.748

PapersInfluence of carbon solid solution on mechanical properties and microstructures on (MnFeCoNi)89Cu11 high-entropy alloysIn refereedAcademic JournalCo-authorMARUYAMA,Toru;Issei OhtaJournal of Japan Foundry Engineering SocietyVol.94 No.9 Page.536-5412022/9/25～Japan Foundry Engineering SocietyJapanese10.11279/jfes.94.535

Academic presentationUnrefereedAcademic JournalCo-authorIWAMA, Ryo;MARUYAMA,Toru;HARADA, Kenji;Goto, JunpeiVol.180th Page.632022/9/20～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.180_63

Academic presentationUnrefereedAcademic JournalCo-authorHATTA, Naoya;MARUYAMA,Toru;SAWADA, Kenji;NISHIHARA, YoshikazuVol.180th Page.132022/9/20～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.180_13

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiVol.180th Page.312022/9/20～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.180_31

Academic presentationUnrefereedAcademic JournalCo-authorMURATA, Yukio;SUGIYAMA, Akira;MARUYAMA,ToruVol.180th Page.622022/9/20～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.180_62

PapersX-Ray Transmission Observation of Mold Filling Behavior Immediately After Pouring in Cast Iron Full-Mold In refereedAcademic JournalCo-authorMURATA, Yukio;SUGIYAMA, Akira;MARUYAMA,ToruJournal of Japan Foundry Engineering SocietyVol.94 No.6 Page.277-2812022/6/25～Japan Foundry Engineering SocietyJapanese10.11279/jfes.94.277

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru;Issei OhtaVol.179th Page.852022/5/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMURATA, Yukio;SUGIYAMA, Akira;MARUYAMA,ToruVol.179th Page.782022/5/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,ToruVol.179th Page.32022/5/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;ASANO, Kazunori;IGARASHI, YoshioVol.179th Page.792022/5/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorFUKUZAWA, Mei;MARUYAMA,ToruVol.178th Page.912021/10/20～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMURATA, Yukio;SUGIYAMA, Akira;MARUYAMA,ToruVol.178th Page.782021/10/20～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorIWAMA, Ryo;MARUYAMA,Toru;HARADA, Kenji;Goto, JunpeiVol.178th Page.772021/10/20～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorYOSHISAKO,Tatsuya;MARUYAMA,Toru;FIJIWARA, Ichiro;FUIWARA, HiroshiVol.178th Page.352021/10/20～Japan Foundry Engineering SocietyJapanese

CommentaryTechnical Review on Special Molding System for Energy Saving and Environmental Conservation In refereedAcademic JournalCo-authorNAGAI, Yasuhiro;MINOWA, Koizou;MARUYAMA,ToruJournal of Japan Foundry Engineering SocietyVol.93 No.9 Page.562-5682021/9/25～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedOtherCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiVol.144th Page.172-1732021/9/6～Japanese

PapersUnrefereedAcademic JournalCo-authorTSURUTA, Hiroaki;MARUYAMA,ToruVol.43 Page.ROMBUNNO.11792021/6/15～Japanese

PapersInfluence of flow rate of test solution on erosion-corrosion resistance of lead-free copper alloys in jet-in-slit testIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiJournal of Japan Foundry Engineering SocietyVol.93 No.6 Page.323-3302021/6～Japan Foundry Engineering SocietyJapanese10.11279/jfes.93.323

Academic presentationSTEM Characterization of Cu distribution in Cu-added spheroidal graphite cast ironUnrefereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;ASANO, Kazunori;IGARASHI, YoshioReports of the 177th JFS MeetingVol.177th, Page. 52021/5～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.177_5

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru;NISHI, HirosukeReorts of the 177th JFS Meeting177th, Page.322021/5～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.177_32

Academic presentationUnrefereedAcademic JournalCo-authorMURATA, Yukio;SUGIYAMA, Akira;MARUYAMA,ToruReport of the 177th JFS Meeting177th, Page.632021/5～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.177_64

Academic presentationUnrefereedAcademic JournalCo-authorTSUJI, Hiroaki;YAMAMOTO, Nobuya;KAI, Tokio;MARUYAMA,Toru;NAKAE, HideoReports of the 177th JFS Meeting117th, Page.832021/5～Japan Foundry Engineering SocietyJapanese10.11279/jfeskouen.177_84

CommentaryBlasting Treatment In refereedAcademic JournalSingle-AuthorMARUYAMA,ToruVol.58 No.2 Page.65-702021/4/30～Japan Foundry Engineering SocietyJapanese

PapersIn refereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;ASANO, Kazunori;IGARASHI, YoshioMaterials TransactionsVol.61, (2020),No.9, pp.1853-18612020/9～The Japan Institute of Metals and MaterialsEnglish

PapersInfluence of Cu2+ and Cl- on Corrosion of Cu Alloys in Chloride Aqueous SolutionsIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiJournal of Japan Institute of Copper59(2020), pp.161-1662020/8～Japan Copper and Brass AssociationJapanese

Research reportSpace Saving for Water Meter by Development of Manufacturing Technology of Lead-Free Bronze CastingsUnrefereedAcademic JournalCo-authorMATSUBAYASHI, Masaki;SIMOMI, Masaaki;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;YASUDA, YoshinobuJournal of Japan Foundry Engineering SocietyVol.92, No.5 (2020), pp.237-2422020/5～Japan Foundry Engineering SocietyJapanese

CommentaryHigh-entropy Steel and High-entropy Cast Iron In refereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,ToruBulletin of The Iro and Steel Institute of Japan25(2020), No.4, pp.218-2272020/4～The Iron and Steel Institute of JapanJapanese

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru;TAKESHI, Nagase;NISHOMOTO, Akio;HOSHIYAMA, YasuhiroInovative Technology WorldNo.150, (2020), pp.218-2272020/3～Organization for Research and Development of Innovative Science and TechnologyJapanese

PapersMeasuring the interfacial heat transfer coefficient between flowing molten alloy and sand mold using fluidity testsIn refereedAcademic JournalCo-authorMOTOYAMA, Yuichi;TOKUNAGA, Hitoshi;YOSHIDA, Makoto;MARUYAMA,Toru;OKANE, ToshimitsuJournal of Materials Processing TechnologyVol. 276 (2020) 1163942020/2～https://doi.org/10.1016/j.jmatprotec.2019.116394This study specifically examined a method using fluidity test results to measure the interfacial heat transfer coefficient (IHTC) between a molten alloy and a mold during flow. Review of earlier studies revealed that conventional methods require the choking area length to calculate the IHTC during flow, but one earlier study used an assumed choking area length. Details of its length remain unclear. Using an arbitrarily chosen choking area length leads to inaccurate acquisition of the IHTC. For this study, we observed the microstructures and macrostructures around a fluidity test specimen tip to ascertain the choking area length. This value led to calculation of the IHTC between the flowing bronze melt and the shell sand mold as 1521 W/m2•K. This study also found a new method requiring no choking area length to ascertain the IHTC between the flowing melt and the sand mold. The IHTC obtained using this method was 1406 W/m2•K, representing a difference of about 8% from the value obtained using a conventional method. This study assessed experimental conditions under which the new method can produce accurate IHTC values.

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru;HOSHIYAMA, Yasuhiro2020/1～Organization for Research and Development of Innovative Science and TechnologyJapanese

PapersCorrosion Behavior of Pb-Free Copper Alloys Immersed in Chloride Aqueous SolutionIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiJ. Japan Inst. Metar.Vol.83, No.11, pp.416-4232019/11～Japan Inst. Metar.Japanese

PapersMicrostructural, mechanical, and corrosion properties of plasma-nitrided CoCrFeMnNi high-entropy alloysIn refereedAcademic JournalCo-authorNISHOMOTO, Akio;FUKUBE, Takahiro;MARUYAMA,ToruSurface and Coatings TechnologyVol.376 (2019), pp.52-582019/10～ElsevierEnglishhttps://doi.org/10.1016/j.surfcoat.2018.06.088

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, Takumi2019/10～Japan Copper and Brass AssociationJapanese

Academic presentationUnrefereedAcademic JournalCo-author2019/9～

Academic presentationUnrefereedAcademic JournalCo-author;MARUYAMA,Toru;YANAGITANI, Hitoshi;;NAKAMOTO, Kouji2019/9～Japan Foundry Engineering SocietyJapanese

PapersElectron Microscopy on Cu Element Distribution in Spheroidal Graphite Cast IronIn refereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;ASANO, Kazunori;IGARASHI, YoshioJournal of Japan Foundry Engineering SocietyVol.91, No.8 (2019), pp.512-5202019/8～Japan Foundry Engineering SocietyJapanesehttps://doi.org/10.11279/jfes.91.512

PapersEffect of Molten Metal Temperature on Mold Filling in Evaporative Pattern CastingIn refereedAcademic JournalCo-authorMARUYAMA,Toru;TAMAKI, Mitsuyoshi;NAKAMURA, Gou;NAKAMURA, KeisukeInternational Journal of MetalcastingVol.13, Issue 3 (2019), pp.611-6172019/7～the American Foundry SocietyEnglishhttps://doi.org/10.1007/s40962-019-00310-7

PapersInfluence of Tellurium Addition to Spheroidal Graphite Cast Iron on the Number of Graphite ParticlesIn refereedAcademic JournalCo-authorSAITO, Ryuta;MARUYAMA,Toru;NAKAMURA, Toshiki;YANAGITANI, Hitoshi;SAKAI, Takahiro;NAKAMOTO, KoujiInternational Journal of MetalcastingVol.13, Issue 3 (2019), pp.571-5772019/7～the American Foundry SocietyEnglishhttps://doi.org/10.1007/s40962-018-00292-y

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru2019/5～Japan Foundry Engineering SocietyJapanese

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru;NISHOMOTO, Akio;HOSHIYAMA, Yasuhiro;TAKESHI, NagaseInovative Technology WorldNo.148, (2019), pp.147-1532019/3～Organization for Research and Development of Innovative Science and TechnologyJapanese

Research reportUnrefereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;IGARASHI, Yoshio2019/2～The Japan Institute of Metals and MaterialsJapanese

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru2019/1～Organization for Research and Development of Innovative Science and TechnologyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;IGARASHI, Yoshio2018/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, Takumi2018/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMOTOYAMA, Yuichi;TOKUNAGA, Hitoshi;OKANE, Toshimitsu;YOSHIDA, Makoto;MARUYAMA,Toru2018/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMINAMI, Akira;SHIMOSUKI, Takumi;ODA, MOEMI;MARUYAMA,Toru2018/10～Japan Foundry Engineering SocietyJapanese

CommentaryUnrefereedAcademic JournalSingle-AuthorMARUYAMA,Toru2018/10～Japan Foundry Engineering SocietyJapanese

Book reviewUnrefereedAcademic JournalCo-authorJournal of Japan Foundry Engineering SocietyVol.90, No.8 (2018), pp.473-4802018/8～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMOTOYAMA, Yuichi;YAMADA, Hiroshi;AKASHI, Takafumi;KURONO, Naoya;YOSHIDA, Makoto;MARUYAMA,Toru2018/5～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorYAMADA, Hiroshi;;;;;MARUYAMA,Toru2018/5～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru;INOUE, Ko;;;;YAMADA, Hiroshi2018/5～Japan Foundry Engineering SocietyJapanese

PapersEvaluation on erosion-corrosion resistance of sulfide-dispersed lead-free copper alloy by the jet-in-slit testIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, TakumiRust Prevention & Control Japan2018/3～Japan Association of Corrosion ControlJapanese

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru;NISHOMOTO, Akio;HOSHIYAMA, Yasuhiro;TAKESHI, NagaseInovative Technology WorldNo.146, (2018), pp.199-2052018/3～Organization for Research and Development of Innovative Science and TechnologyJapanese

PapersIn refereedAcademic JournalCo-authorMaterials TransactionsVol.59, (2018), No.2, pp.255-2642018/2～The Japan Institute of Metals and Materials

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru2018/1～Organization for Research and Development of Innovative Science and TechnologyJapanese

PapersIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA, Toru;HARUNA, TakumiMaterials TransactionsVol.58, (2017),No.12, pp.1679-16862017/12～The Japan Institute of Metals and Materials

CommentaryUnrefereedAcademic JournalCo-authorKANNO, Toshitake;MARUYAMA,Toru2017/11～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorReports of the 170th JFS Meeting and the FY29 JFS Autumn Lecture Meeting2017/10/1～2017/10/1Japan Foundry Engineering Society

CommentaryUnrefereedAcademic JournalCo-authorHIRATSUKA, Sadato;ASO, Setsuo;MARUYAMA,Toru2017/10～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorReports of the 170th JFS meeting2017/9/30～2017/9/30Japan Foundry Engineering Society

Academic presentationUnrefereedAcademic JournalCo-authorReports of the 170th JFS Meeting and the FY29 JFS Autumn Lecture Meeting2017/9/30～2017/9/30Japan Foundry Engineering Society

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MARUYAMA, Toru;HARUNA, Takumi2017/9/29～

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MARUYAMA,Toru;HARUNA, Takumi2017/9～Japanese

PapersCathodic Decomposition Reaction of Cu2S in Sulfide-Dispersed Pb-Free Copper Alloy In refereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA, Toru;HARUNA, Takumi2017/8/1～

CommentaryTribology of Lead-Free Copper Alloy CastingsUnrefereedAcademic JournalCo-authorMARUYAMA,Toru2017/8～Japanese

Academic presentationUnrefereedAcademic JournalCo-authorYASUDA, Yoshinobu;MIZUTANI, Naohiro;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA, Toru;HARUNA, Takumi2017/6/26～

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru;SAITO, Ryuta;NAKAMURA, Toshiki;YANAGITANI, Hitoshi;SAKAI, Takahiro;NAKAMOTO, Kouji2017/5～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorTAKESHI, Nagase;MARUYAMA,Toru;IGARASHI, Yoshio2017/5～Japan Foundry Engineering SocietyJapanese

Academic presentationUnrefereedAcademic JournalCo-authorMARUYAMA,Toru2017/5～Japan Foundry Engineering SocietyJapanese

PapersIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;YOSHII, Hisamitsu;KODERA, Yoshihito;MATSUBAYASHI, Ryozo;MARUYAMA, Toru;HARUNA, TakumiJournal of the Surface Finishing Society of JapanVol. 68, No. 4, pp. 201-2072017/4～The Surface Finishing Society of Japan

PapersIn refereedAcademic JournalCo-authorTakeshi Nagase;Mamoru Takemura;Mitsuaki Matsumuro;Toru MaruyamaJournal of Japan Foundry Engineering SocietyVol. 89, p. 119-1292017/3～

PapersEffect of Coating Thickness on the Molten Metal Filling Rate of Cast Iron in the Evaporative Pattern Casting ProcessIn refereedAcademic JournalCo-authorToru Maruyama;Gou Nakamura;Mitsuyoshi Tamaki;Keisuke NakamuraInternational Journal of MetalcastingVol. 11, p. 77-832017/1～10.1007/s40962-016-0108-51939-5981

Research reportUnrefereedIn-house publicationCo-authorMARUYAMA,Toru2017/1～Organization for Research and Development of Innovative Science and TechnologyJapanese

Academic presentationUnrefereedAcademic JournalCo-author;;NISHOMOTO, Akio;MARUYAMA,Toru2016/12～Japanese

Academic presentationUnrefereedOtherCo-authorNAKAMURA, Toshiki;SAITO, Ryuta;MARUYAMA,Toru;YANAGIYA, Hitoshi;SAKAI, Takahiro;NAKAMOTO, KojiReports of the 168th JFS Meeting and the FY28 JFS Autumn Lecture Meeting2016/9/25～

Academic presentationUnrefereedOtherCo-authorSHIMOSUKI, Takumi;NAKAMURA, Keisuke;MARUYAMA,ToruReports of the 168th JFS Meeting2016/9/25～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorNAGASE, Taketsugu;TAKEMURA, Mamoru;MATSUMURO, Mitsuaki;MARUYAMA, ToruReports of the 168th JFS Meeting and the FY28 JFS Autumn Lecture Meeting2016/9/25～Japan Foundry Engineering Society, Japan Foundry Society, Inc.

Academic presentationUnrefereedOtherCo-authorNAKAOKA, Shota;HIRONO, Mamoru;MARUYAMA,Toru;ISHIKAWA, Tomoya;MATSUMOTO, Takuya;FUJISHIRO, Takahiro;OGINO, Tomoya;MIKI, Satoshi;TANAKA, Yoshiki;KOGUSU, TatsuyaReports of the 168th JFS Meeting and the FY28 JFS Autumn Lecture Meeting2016/9/25～Japan Foundry Engineering Society, Japan Foundry Society, Inc.

International academic conferenceUnrefereedSingle-AuthorToru Maruyama2016/8/26～

International academic conferenceOtherCo-author2016/8/3～

International academic conferenceEffect of coating thickness on Melt Filling Rate of Cast Iron in Evaporative Pattern Casting ProcessOtherCo-authorToru Maruyama;Gou Nakamura;Mitsuyoshi Tamaki;Keisuke NakamuraProceedings of the 72nd World Foundry Congress2016/5/23～World Foundry OrganizationNagoya, JapanEnglish

International academic conferenceOtherCo-author2015/12/19～

PapersInfluence of Phosphorus on Mechanical Properties, Fluidity and Pressure Toughness of Lead Free Bronze Castings with Dispersed Sulfide ParticlesIn refereedAcademic JournalCo-authorMARUYAMA,Toru;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;TERAMURA, Masakazu;AKASHI, Takafumi;SATOH, Nobuhito;KOBAYASHI, Takeshifluidity;lead-free bronze castings;mechanical properties;microstructure;phosphorus;pressure toughness;sulfideJournal of Japan Foundry Engineering Society87(2015), 849-8542015/12～Japan Foundry Engineering SocietyLead-free bronze castings dispersed with sulfide particles, whose main composition is the same as JIS CAC411, and which contains over 0.05mass% phosphorus as a residual element, were prepared. Tensile test, fluidity test, microstructure test and pressure toughness test of the lead-free bronze castings were carried out. Results of the tensile tests for JIS CAC406 castings, which are used as common bronze castings, show that the elongation of some specimens containing over 0.05 mass% phosphorus is below the JIS requirement of 15%. In contrast, the elongation of the lead-free bronze castings dispersed dispersed with sulfide particles was over 15% even phosphorus content was increased to about 0.1mass%. Increasing the phosphorus content improves the fluidity of the lead-free bronze castings and realizes excellent pressure toughness. In addition, the results of measurement of elemental distribution by EPMA reveal the presence of regions composed of phosphorus and nickel. This suggests that a certain amount of phosphorus exist as a compound composing of phosphorus and nickel.

Academic presentationInfluence of phosphorus on the solidification temperature of nickel-base self-fluxing alloyOtherCo-author2015/11/12～

Academic presentationCorrosion resistance of Zn-Ti pseudo alloy sprayingOtherCo-author2015/11/12～

Academic presentationOtherCo-author2015/11/2～Japan Copper and Brass Association

International academic conferenceOtherCo-author2015/10/29～

Academic presentationUnrefereedOtherCo-authorUMEMORI,Tatsuya;YOSHIDA,Ryouko;MARUYAMA,Toru2015/10/25～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;MATSUSHITA,Akira;NAKAZAWA,Tomoaki;YOSHIDA,Makoto;AKASHI,Iwao;AKASHI,Takafumi;YOSHIDA,Ryouko;OKANE,Toshimitsu;YAMASHITA,Shouhei;MORI,Takuki;KODATE,Sadaharu2015/10/25～Japan Foundry Engineering Sociaty

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;AZUMA,Takahiro;NISHIDA,Hidemaro;YOSHISAKO,Tatsuya;YAMADA,Ryosuke;YAMADA,Osamu;KINOSHITA,Hidehiko2015/10/25～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;NAKAMURA,Keisuke;NAKAMURA,Go2015/10/25～Japan Foundry Engineering Society

CommentaryUnrefereedOtherSingle-AuthorMARUYAMA,Toru2015/9/30～

Academic presentationOtherCo-authorYASUDA, Yoshinobu2015/9/10～

Research reportUnrefereedOtherSingle-AuthorMARUYAMA,Toru2015/9～Japanese

PapersCorrosion Properties of Sulfide-Dispersed Lead-Free Bronze Castings by Electrochemical Polarization MethodIn refereedAcademic JournalCo-authorYASUDA, Yoshinobu;ABE, Hiroyuki;MATSUBAYASHI, Ryozo;MARUYAMA,Toru;HARUNA, Takumilead-free bronze casting;CAC411;polarization curve;electrochemical properties;copper sulfideJournal of Japan Institute of Copper54(2015), 113-1182015/8/1～

International academic conferenceOtherCo-authorToru Maruyama;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi Kobayashi2015/6/15～

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;NISHIDA,Hidemaro;AZUMA,Takahiro;YOSHISAKO,Tatsuya;YAMADA,Osamu;KINOSHITA,Hidehiko2015/5/24～Japanese Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;UEDA,Kodai;UMEMORI,Tatsuya;YOSHIDA,Ryoko2015/5/24～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;ABE,Hiroyki;MATSUBAYASHI,Ryozo;TERAMURA,Masakazu;KOBAYASHI,Takeshi2015/5/24～Japan Foundry Engineering Society

LectureUnrefereedOtherSingle-AuthorMARUYAMA,Toru2015/1/22～関西大学

LectureUnrefereedIn-house publicationSingle-AuthorMARUYAMA,Toru2015/1～Organization for Research and Development of Innovative Science and TechnologyJapanese

PapersEffect of amount of products suspended in melt after spheroidizing treatment on graphite nodule count in spheroidal graphite cast ironIn refereedAcademic JournalSingle-AuthorToru Maruyamaaluminum nitride;cast iron;graphite nodule count;magnesium nitride;nuclear product;oxysulfide;spheroidal graphite;thermodynamic calculation2014/11～Correlation relationships between graphite nodule count evaluated by casting experiment and equilibrium amount of chemical compounds calculated by thermodynamic calculation were investigated for clarifying effect of graphite nodule count on amount and formation temperature of nuclear products for graphite nucleation in spheroidal graphite cast iron melt. Graphite nodule counts of spheroidal graphite cast iron varied in additive amounts of calcium, aluminum and sulfur were measured. Equilibrium phases in the cast iron melt with same chemical compositions were calculated in a condition at 1150℃ without graphite crystallization. Calculated melting points of oxysulfdie in which is composed mostly of sulfides was higher than temperature of spheroidizing treatment. It is suggested that the oxysulfide is suspended in the melt before pouring. Magnesium nitride was stable in temperature below 1300℃-1350℃, and in a case that aluminum content was increased to about 0.02mass%, aluminum nitride was stable in temperature below 1300℃-1380℃. There is negative correlation between the graphite nodule count and the amount of aluminum nitride although there are no correlation relationships between graphite nodule count and formation temperature and amount of the oxysulfide, magnesium oxide and magnesium nitride.

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;UCHIDA,Keita;KOGUSU,Tatsuya;YAN,Hiroharu;KOBAYASHI,Takeshi2014/10/1～Japan Foundry Engineering Society

PapersPreparation of Lead-Free Machinable Brass dispersed MnS by Hot Extrusion of Machined ChipsIn refereedAcademic JournalCo-authorSATO, Naoki;TAKEDA, Ryosuke;NISHIMOTO, Akio;MARUYAMA,Toru60/40 brass;machined chips;hot extrusion;machinable brass;manganese sulfide;lead-free copper alloy2014/8/1～

PapersEffect of temperature of solution and aging heat treatment on hardness of Cu-Zn-Ni-Mn system alloyIn refereedAcademic JournalCo-authorMARUYAMA,Toru;YAMAZAKI, Masaru;KUROSE, Kazuhito;HAGIWARA, KohichiJournal of Japan Institute of Copper53(2014), 78-822014/8/1～Temperature of solution heat treatment and aging heat treatment of Cu-Zn-Ni-Mn-Pb alloy were investigated by thermodynamics calculation, microstructural analysis and evaluation of hardness. Solution heat treatment temperature is 700℃. β’phase is precipitated by aging heat treatment at 500℃ and 400℃. Phase boundary between β phase and β’ phase was estimated by thermodynamics calculation. Hardness of the alloy decreases with increasing aging time just after starting aging heat treatment, and increases with increasing aging time after 1h in the case of 500℃ and 2h in the case of 400℃.

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;HIROHATA,Mitshiro2014/6/3～Japan Thermal Spray Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;UMEMORI,Tatsuya;YOSHIDA,Ryoko2014/6/1～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;NAKAMURA,Go;TAMAKI,Mitsuhiro2014/6/1～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;INOUE,Fumiya2014/6/1～Japan Foundry Engineering Society

PapersEffect of Cooling Rate and Dissolved Oxygen Content on Sulfide Morphology in Cu-Sn-Zn-S Alloy CastingsIn refereedAcademic JournalCo-authorRyoko Yoshida;Toru Maruyama;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi Kobayashi;Toshihide TakenakaJournal of Japan Foundry Engineering SocietyVol. 86, No. 1, p. 26-302014/1/25～

Academic presentationAcademic Journal2013/11/16～

Academic presentationAcademic JournalNaoki Satoh;;Akio Nishimoto;Toru Maruyama2013/11/16～

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;HARUNA,Takumi;ODA,Hiroki;KOBAYASHI,Takeshi2013/11/16～Japan Copper and Brass Association

LectureUnrefereedOtherCo-authorMARUYAMA,Toru;KOBAYASHI,Takeshi2013/11/16～Japan Copper and Brass Association

Academic presentationOtherFumiya inoue;Toru Maruyama2013/11/12～

Academic presentationAcademic JournalKyohei Kondo;Toru Maruyama;Yasufumi YamaguchiReports of the 163rdth JFS MeetingVol. 163, p. 632013/10/27～

Academic presentationAcademic JournalToru Maruyama;Yuma Muramoto;Horoyuki Iyota;Isamu Ide;Shinji NishidaReports of the 163rdth JFS MeetingVol. 163, p. 572013/10/27～

Academic presentationAcademic JournalHoroyuki Iyota;Satoshi Ogura;Toshinari Nishimura;Isamu Ide;Shinji Nishida;Toru MaruyamaReports of the 163rdth JFS MeetingVol. 163, p. 582013/10/27～

Academic presentationAcademic JournalMitsuyoshi Tamaki;Gou Nakamura;Toru MaruyamaReports of the 163rdth JFS MeetingVol. 163, p. 772013/10/27～

Academic presentationAcademic JournalGou Nakamura;Mitsuyoshi Tamaki;Toru MaruyamaReports of the 163rdth JFS MeetingVol. 163, p. 782013/10/27～

Academic presentationAcademic JournalHiroki Tanaka;Takashi Nakamura;Toru Maruyama;Ryosuke Yamada;Hidehiko KinoshitaReports of the 163rdth JFS MeetingVol. 163, p. 62013/10/26～

Academic presentationAcademic JournalRyoko Yoshida;Toru Maruyama;Makoto Yoshida;Iwao Akashi(Akashi godo);Takafumi Akashi;Toshimitsu Okane;Syohei Yamashita;Hiroki. Mori;Sadaharu KodateReports of the 163rdth JFS MeetingVol. 163, p. 232013/10/26～

Academic presentationAcademic JournalToru Maruyama;Yuma Muramoto;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi KobayashiReports of the 163rdth JFS Meetingp. 252013/10/26～

Academic presentationAcademic JournalToru Maruyama;Ryoko Yoshida;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi KobayashiReports of the 163rdth JFS Meetingp. 262013/10/26～

Academic presentationAcademic Journal;Makoto Yoshida;Iwao Akashi(Akashi godo);Takafumi Akashi;Ryoko Yoshida;Toru Maruyama;Toshimitsu Okane;Syohei Yamashita;Hiroki. Mori;Sadaharu KodateReports of the 163rdth JFS Meetingp. 242013/10/26～

International academic conferenceEffect of chemical composition on spheroidizing of sulfide in lead free bronze with dispersed sulfide particlesOtherToru Maruyama;Ryoko Yoshida;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi KobayashiThe 4th Korea-Japan Conference for Young Foundry Engineers2013/9/7～Muroran

International academic conferenceEffect of melt temperature on formation of liquefied resin produced by thermal decomposition during evaporative pattern castingOtherMitsuyoshi Tamaki;Gou Nakamura;Toru MaruyamaThe 8th International Symposium in Science & Technology2013/8/23～Suita

International academic conferenceEffect of coating permeability and coating thickness on melt flow rate in evaporative pattern castingOtherGou Nakamura;Mitsuyoshi Tamaki;Toru MaruyamaThe 8th International Symposium in Science & Technology2013/8/23～Suita

International academic conferenceThe effect of cooling rate on dendrite arm spacing of the lead free bronze with dispersed sulfide particlesAcademic JournalToru Maruyama;Kyohei Kondo;Ryoko Yoshida8th Pacific Rim International Congress on Advanced Materials and Processing2013/8/8～

International academic conferenceEffect of Monotectic Reaction on Solidification Cracking Resistance of Lead Free BronzeAcademic JournalRyoko Yoshida;Toru Maruyama;Toshihide Takenaka8th Pacific Rim International Congress on Advanced Materials and Processing2013/8/7～

Academic presentationAcademic JournalToru Maruyama;Yoshihiro Nakamura;Takeshi KobayashiReports of the 162nd JFS Meetingp. 472013/5/26～

Academic presentationAcademic JournalToru Maruyama;Kenta Tsujie;Takeshi KobayashiReports of the 162nd JFS Meeting162, p. 572013/5/26～

Academic presentationAcademic JournalToru Maruyama;Natsuki Sakai;Keita Uchida;Tatsuya Ogusu;Hiroharu Eki;Takeshi KobayashiReports of the 162nd JFS Meetingp. 382013/5/25～

PapersEffect of Work Hardening of Substrate Surface on Adhesion of Zinc Alloy Sprayed CoatingsIn refereedAcademic JournalCo-authorToru Maruyama;Mitsuhiro HirohataJournal of Japan Thermal Spray SocietyVol. 50, No. 2, p. 64-672013/4/30～Japan Thermal Spray SocietyJapaneseAdhesive strength of zinc alloy sprayed coatings on an annealed steel substrate after girt blasting was measured to understand an effect of work hardening of a substrate surface on adhesive strength between the substrate and the sprayed coatings. The annealed substrate was prepared by heat treatment in reduced atmosphere. The sprayed coatings were prepared by a wire flame spraying process. Degree of work hardening of the substrate was changed by changing blasting time. In the case without annealing, the hardness of the blasted substrate increases with increasing blasting time, and the adhesion increases with increasing hardness of the blasted substrate surface. In the case with annealing, the hardness of the blasted substrate is same as the hardness before blasting. Nevertheless, the adhesion is almost same as the case without annealing. There are no effects of work hardening of the steel substrate surface on the adhesion of the zinc alloy sprayed coatings.

Academic presentationOtherFumiya inoue;Toru Maruyamap. 22012/11/7～Japanese

Academic presentationOtherNatsuki Sakai;Toru Maruyamap. 42012/11/7～Japanese

Academic presentationOtherToru Maruyama;Yasuyuki Morisawap. 52012/11/7～Japanese

Academic presentationOtherMitsuhiro Hirohata;Toru Maruyamap. 72012/11/7～Japanese

Academic presentationAcademic JournalTakashi Nakamura;Toru Maruyama;Ryosuke Yamada;Hidehiko Kinoshita;Hideo OhmuraReports of the 161th JFS Meetingp. 722012/10/14～Japan Foundry Engineering SocietyJapanese

Academic presentationAcademic JournalYoshihiro Nakamura;Toru Maruyama;Takeshi KobayashiReports of the 161th JFS Meetingp. 52012/10/13～Japan Foundry Engineering SocietyJapanese

Academic presentationAcademic JournalRyota Tatsumi;Toru Maruyama;Takeshi KobayashiReports of the 161th JFS Meetingp. 622012/10/13～Japan Foundry Engineering SocietyJapanese

Academic presentationAcademic JournalKenta Tsujie;Toru Maruyama;Takeshi KobayashiReports of the 161th JFS Meetingp. 1352012/10/13～Japan Foundry Engineering SocietyJapanese

LectureToru Maruyama;Kenta Tsujie;Y. Suzuki;Takeshi Kobayashi2012/9/21～Japanese

International academic conferenceDevelopment of lead free bronzefor permanent mold casting processOtherToru Maruyama;Takeshi Kobayashi The 7th International Symposium in Science & Technology2012/8/30～PinangEnglish

International academic conferenceThe effect of temperature in thermal decomposition gas gap on the melt flow rate in evaporative pattern castingOtherMitsuyoshi Tamaki;Toru MaruyamaThe 7th International Symposium in Science & Technology2012/8/30～PinangEnglish

International academic conferenceDevelopment of high strength large castings of carbon steel with variety of micro-alloyOtherHiroki Tanaka;Takashi Nakamura;Toru MaruyamaThe 7th International Symposium in Science & Technology2012/8/30～PinangEnglish

International academic conferenceThe effect of work hardening of substrate surface on adhesion of the zinc alloy sprayed coatingOtherMitsuhiro Hirohata;Toru MaruyamaThe 7th International Symposium in Science & Technology2012/8/30～PinangEnglish

PapersSolidification Cracking Resistance in Permanent Mold Casting Process for Sulfide Dispersed Lead Free Bronze CastingsIn refereedAcademic JournalCo-authorRyoko Yoshida;Toru Maruyama;Hiroyuki Abe;Ryozo Matsubayashi;Masakazu Teramura;Takeshi Kobayashi;Toshihide TakenakaJournal of Japan Foundry Engineering SocietyVol. 84, No. 7, p. 383-3882012/7/5～Japan Foundry Engineering SocietyJapaneseThe applicability of the permanent mold casting process for the lead free bronze with dispersed sulfide was evaluated with comparison of other conventional copper alloys, such as the leaded bronze, the leaded brass, the lead free bronze including bismuth. The copper alloys were cast into the permanent mold for the solidification cracking test. The relationship between the degree of cracking and the range of the solidification temperature was examined. The lead free bronze with dispersed sulfide was more unbreakable than the other copper alloys. The smaller solidification temperature range, the harder the solidification cracking occurred. In the lead free bronze with dispersed sulfide, there were differences of the dendrite form near by the fracture and the distribution of the residual melt segregated at a part of the end of the solidification. The lead free bronze may have a solidification form being unlikely to crack, and it is possible to apply the permanent mold castings process rather than the other copper alloys. The applicability is almost same as brass castings.

Academic presentationAcademic JournalMitsuyoshi Tamaki;Toru MaruyamaReports of the 160th JFS Meetingp.882012/5/29～Japan Foundry Engineering Society

Academic presentationAcademic JournalToru Maruyama;Yoshitomo Mizuta;Keita Uchida;Tatsuya Ogusu;Hiroharu Eki;Takeshi KobayashiReports of the 160th JFS Meetingp. 892012/5/29～Japan Foundry Engineering Society

Academic presentationAcademic JournalToru Maruyama;Ryuichi Sakaguchi;Takeshi KobayashiReports of the 160th JFS Meetingp. 182012/5/29～Japan Foundry Engineering Society

Academic presentationAcademic JournalRyoko Yoshida;Toru Maruyama;Iwao Akashi(Akashi godo);Takafumi Akashi(Akashi godo);Toshimitsu Okane(AIST);Syohei Yamashita(J Mater.);Sadaharu Kodate(Riko Kihara);Hiroki. Mori(Azbil Kimmon);Takeshi Kobayashi (ORDIST)Reports of the 160th JFS Meetingp.172012/5/28～Japan Foundry Engineering Society

Academic presentationAcademic JournalToru Maruyama;Kenta Tsujie;Y. Suzuki;Takeshi KobayashiReports of the 160th JFS Meetingp.512012/5/28～Japan Foundry Engineering Society

International academic conferenceEvaluation of Sprayed Coatings by Electrical MethodUnrefereedAcademic JournalCo-authorYasuyuki Morisawa (D);Toru MaruyamaProceedings of International Thermal Spray conference 2012708-70112012/5/23～ASM InternationalHoustonA method for evaluating the adhesion of metallic thermally sprayed coatings by measuring the electrical resistance of the coating sprayed on a metal substrate was carried out. The thermal sprayed coatings were made of zinc alloy on carbon steel substrates, The electrical resistance levels between the substrates and coatings were evaluated. The electrical resistance increases with increasing measurement time. The larger the rate of increase of the electrical resistance, the lower the adhesive strength. There is a possibility to evaluate qualitatively the adhesion properties.

International academic conferenceAdhesion Properties of Sprayed Coatings on Substrate Blasted by Multiangle BlastingUnrefereedAcademic JournalCo-authorToru Maruyama;Takanori Kishita (D)Proceedings of International Thermal Spray conference 2011758-7622012/5/22～ASM InternationalHoustonAdhesion properties on the substrate blasted by multi-angle blasting with white alumina grit were examined. The low carbon steel substrates were blasted at two blasting angles (high and low angles) in a multi-angle blasting process. The sprayed coating of zinc alloy was evaluated by an adhesion test. The surface roughness levels after the multi-angle blasting were lower than those in the case of normal blasting. The multi-angle blasting was an effective blasting process to obtain improved adhesive properties. The low blasting angle may have contributed for removing contamination from the substrate surface. The high blasting angle may have contributed for an effective surface roughness to enhance the adhesive properties.

International academic conferenceApplicability of Permanent Mold Casting for Lead Free Bronze with Sulfide DispersionUnrefereedAcademic JournalCo-authorRyoko Yoshida (D);Toru Maruyama;Hiroyuki Abe (N. E. IRC of Shiga Pref.);Ryozo Matsubayashi (Biwalite);Masakazu Teramura (Biwalite);Takeshi Kobayashi (ORDIST)copper;alloy;permanent mold;casting;lead free bronze;solidification cracking;sulfide;dispersionProceedings of 70th World Foundry Congress2012/4/27～World Foundry OrganizationMonterreyThe leaded bronze, the leaded brass the lead free bronze including bismuth the lead free bronze with sulfide dispersion were cast into the permanent mold for the solidification cracking test The applicability of the permanent mold casting process for bronzes was evaluated with comparison of the range of the solidification temperature. The lead free bronze with sulfide dispersion was more unbreakable than the other copper alloys. There are differences the dendrite form near by the fracture and the distribution of residual melts segregated at a part of the end of the solidification. The lead free bronze with sulfide dispersion may have a solidification form being unlikely to crack. The lead free bronze with sulfide dispersion is possible to apply the permanent mold castings process rather than the other copper alloys, and the applicability is almost same as brass castings.

PapersEFFECT OF NITRIDING PARAMETER ON ACTIVE SCREEN PLASMA NITRIDING RESPONSE OF SACM645 STEELIn refereedIn-house publicationCo-authorMARUYAMA,Toru;NISHIMOTO,Akio;NII,Hiroaki;HARUNA,Takumi;MIYAKE,HidekazuSci Technol Rep Kansai UnivNo.54 Page.183-1902012/3/20～Kansai University

PapersInfluence of Alloying Elements on Sulfide Formation in Lead Free Bronze Castings with dispersed sulfide particlesIn refereedAcademic JournalCo-authorMARUYAMA,Toru;ABE,Hiroyuki;HIROSE,Kazuteru;MATSUBAYASHI,Ryozo;KOBAYASHI,TakeshiMater TransVol.53 No.2 Page.380-3842012/2～Japan Institute of Metals

PapersIn refereedIn-house publicationCo-authorMARUYAMA,Toru;CHEN Chia‐Chin;HSIEH Ping‐Hsun;SELMAN J. Robert2012～

Academic presentationUnrefereedOtherCo-authorHironori Suzuki;Toru Maruyama2011/12/15～

Academic presentationUnrefereedOtherCo-authorToru Maruyama;Naoki Miyazaki;Takeshi Kobayashi2011/11/25～

International academic conferenceGas Temperature in Thermal Decomposition Gas Gap on Evaporative Pattern CastingUnrefereedOtherCo-authorToru Maruyama;Takeshi KobayashiProceedings of the 4th Korea-Japan Conference for Young Foundry Engineers2011/11/10～2011/11/11Gyeongju英語

International academic conferenceUnrefereedOtherCo-authorYoshinori Manju;Toru Maruyama;Jen-Chou HsiungProceedings of the 4th Korea-Japan Conference for Young Foundry Engineers2011/11/10～2011/11/11Koria Foundry Society and Japan Foundry Engineering Society英語

Academic presentationUnrefereedAcademic JournalCo-authorToru Maruyama;Kenta Tsujie;Akifumi Suzuki;Takeshi KobayashiReports of the 159th JFS Meeting2011/10/15～2011/10/18Japan Foundry Engineering Society

Academic presentationUnrefereedAcademic JournalCo-authorYuma Muramoto;Toru Maruyama;Hiroyuki Abe;Masaki Matsubayashi;Masakazu Teramura;Takeshi KobayashiReports of the 159th JFS Meeting2011/10/15～2011/10/18Japan Foundry Engineering Society

Academic presentationRyuichi Sakaguchi;Toru Maruyama;Takeshi KobayashiReports of the 159th JFS Meeting2011/10/15～2011/10/18Japan Foundry Engineering Society

Academic presentationUnrefereedAcademic JournalCo-authorYoshitomo Mizuta;Toru Maruyama;Keita Uchida;Tatsuya Ogusu;Hiroharu Eki;Takeshi KobayashiReports of the 159th JFS Meeting2011/10/15～2011/10/18Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;FUNAKI,Katsuyuki;FUJII,Kaname;OKANE,Toshiitsu;AKASHI,Iwao;KOBAYASHI,Takeshi2011/10/1～Japan Foundry Engineering Society

International academic conferenceEffect of hardness in blasted substrate surface on adhesive strength of sprayed coatingsUnrefereedAcademic JournalCo-authorProceedings of International Thermal Spray conference 20112011/9/26～2011/9/29Proceedings of International Thermal Spray conference 2011HamburgThe effect of the hardness in the substrate surface blasted by a grit blasting process on the adhesive strength of Zn-Al sprayed coatings is investigated to find the adhesive strength is improved by work hardening of the substrate surface. The adhesive strength between a substrate of a carbon steel and sprayed coatings of Zn-Al alloy sprayed by a wire flame spraying process is measured. The substrate is roughened by the grit blasting process with white alumina girt in various blasting angles and blasting time. The hardness is measured in around 20 micro-meter depth from the substrate surface. The adhesive strength increases with increasing the hardness even if the surface roughness is almost same. There is the definite correlation between the adhesive strength and the hardness rather than the surface roughness.

PapersImprovement of Frictional Wear Property of Lead-free Bronze Castings by Lamellar Eutectoid StructureIn refereedAcademic JournalCo-authorlead-free cronze;copper alloy castings;eutectoid transformation;intermetallic compound;wear resistance2011/9/25～For substitution of lead bronze, the metallic structure control technique using the eutectoid transformation was employed to develop leadfree or low lead copper alloys for bearings. A lot of the lamellar eutectoid structure of the coppertin based intermetallic compound and the copper solid solution containing fine bismuth precipitates were dispersed in ascast alloys by means of the alloy design technique. The lamellar eutectoid structure was formed between primary α dendrite arms after transformation of a part of β phase without producing granular δ phases. In the range of tin content from 4 to 12 mass%, the amount of the eutectoid structure was linearly increased with the tin content. And above 12 mass%, it was turned to decreasing. The alloy containing of the lamellar eutectoid structure showed higher antiseizing and higher abrasion resistances than those of the lead bronze LBC3. It was considered that the texture of laminate composite and fine bismuth precipitates containing were produced an excellent results to the frictionalwear properties.

LectureUnrefereedOtherCo-authorToru Maruyama;Takeshi Kobayashi2011/9/16～

CommentarySurface State of Substrate and Adhesion of Thermal Sprayed CoatingsUnrefereedOtherCo-author2011/8/31～

Research reportUnrefereedOtherCo-authorMARUYAMA,Toru;TOKORO,Toshio;ONO,Tokuhito;ABE,Hiroyuki;KOBAYASHI,Takeshi;SHIGA Bulb Cooperative;BIWARRITE2011/7～

International academic conferenceLead Free Bronze Castings with Sulfide Dispersion for Water Supply ProductsUnrefereedAcademic JournalCo-authorNewcast Forum2011/6/29～2011/7/1Newcast ForumDusseldorf

International academic conferenceCharacteristic of Permanent Mold Casting for Sulfide Dispersed Lead Free BronzeUnrefereedAcademic JournalCo-authorEoropean Metallurgical Conference 20112011/6/26～2011/6/29Eoropean Metallurgical Conference 2011Dusseldorf

Academic presentationAcademic JournalCo-author2011/6/7～

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;KINOSHITA,Takaaki;KOBAYASHI,Takeshi2011/6/6～

Academic presentationAcademic JournalCo-author2011/5/28～

Papers摩擦材料用鉛フリー青銅合金の焼結とトライボロジー特性In refereedAcademic JournalCo-authorMARUYAMA,Toru;SATO,Tomohiro;HIRAI,Yoshimasa;KOBAYASHI,Takeshi2011/2～

International academic conferenceAlloy Designing and Properties of Sulfide Dispersed Lead Free Bronze CastingsUnrefereedAcademic JournalCo-authorProceedings of 69th World Foundry Congress278-2822010/10/16～2010/10/20World Foundry OrganizationHangzhouEnglishSulfide was focused on for the substitute substance of lead due to lubricant property of sulfide. The way of dispersion of the sulfide in a matrix had been attempted although sulfide density is too small not to separate from a melt during melting. Some elements are added into copper alloy to decrease sulfur activity for formation of sulfide in copper alloy. Cu-Sn-Zn-S system alloy is cast into sand mold to prepare specimens for investigations of microstructure, casting property, mechanical property and machinability. Sulfide dispersion has been achieved through addition of alloying elements to control sulfur activity in copper melt during solidification. Sulfide formed during solidification after developing primary alpha copper dendrite. The sulfide dispersion was observed in the matrix. The microstructure of the sulfide dispersion was confirmed by optical microscope and SEM. Elemental distribution was also investigated by EDX and WDX. The sulfide is mainly copper sulfide. Few shrinkage cavities were observed as the result of dye penetrant test. Mechanical properties of sand castings were above 195MPa and 15% elongation, which are the required value for conventional bronze castings. Machinability showed almost same as the lead containing castings.

PapersIn refereedAcademic JournalCo-author2010/10/10～Pb-free materials are increasingly desired by environmental regulations. However, Cu alloys in friction materials contain Pb to retain excellent sliding characteristics. In sintering processes, Pb also has important characteristics such as a low-melting point, which allows it to be diffused into other high-melting point materials, for example in Cu atomized alloys. A replacement for Pb, namely Cu alloys, which contain sulphides in their atomized powders are developed. Sulphides are utilized for the purpose of making a solid lubricant. The Cu alloys developed indicate good properties as friction materials based on results from a pin-on-disk-type tribological test. However, sulphides do not generally work as low-melting point materials in sintering processes. Therefore, selected Cu–Sn alloy powders are mixed with bronze before sintering processes for use as low-melting point materials.

PapersIn refereedAcademic JournalCo-author2010/10/10～Cu-Sn-Pb (lead bronze) alloys show good tribological properties because of their sliding characteristic. However, due to environmental regulations or trends, Pb has to be replaced by another material. So, sulfide dispersed Pb-free copper alloys have been developed using sintering of atomized powders. For the developed Cu alloys, pin-on-disk type tribological test were performed under various pressure, disc rotation speed, roughness and lubricant oils. In comparison with the tribological properties of Cu-Sn-Pb alloys, the developed material exhibits the same and/or better tribological characteristics, such as coefficient of friction, anti-scoring. It seems that sulfide plays a role of solid lubricant. As a result, developed Cu alloys containing sulfide may replace Cu-Sn-Pb alloys in tribological field.

Academic presentationAcademic JournalCo-author2010/9/15～Japan Foundry Engineering Society

PapersDegassing and Deoxidation Reaction in Casting for CupronickelIn refereedAcademic JournalCo-author2010/8/1～Hydrogen solubility in molten cupronickel is significantly increased by the presence of Ni. Therefore, gas defects become a major problem. In addition copper alloys to dissolve hydrogen and oxygen while maintaining a certain balance. Therefore, in order to produce a sound casting, it is necessary to remove hydrogen and oxygen are at the same time. So, CaF2 studied the simultaneous treatment with degassing and deoxidation. Shown by the following formula CaF2 deoxidation reaction when using the degassing.CaF2 + O + 2H → CaO + 2HF↑ 　………(1)(1) can be performed simultaneously in the reaction of dehydrogenation and deoxidation expression. After dissolving soluble materials, CaF2 completely covered with the molten metal in flux. The lining of a pressure agent graphite Rutsu (Al2O3) in a mixture of CaF2 and attempted to improve the effect of degassing and deoxidation. The results obtained are as follows.CaF2 reduces the amount of gas to cover the defects in the flux of molten metal containing. In addition, the effect showed a tendency to increase the longer the degassing and deoxidation time of flux coating. The lining of the crucible during the drug showed a tendency to improve the effect of CaF2 deoxidation and degassing and mixing.

Research reportIn-house publicationCo-author2010/6～

International academic conferenceEffect of Blasting Angle and Blasting Time on the Amount of Residual Grit blasted on Steel Substrate and Adhesive Property of Sprayed Coating2010/5/3～2010/5/5International Thermal Spray Conference 2010SingaporeEnglish

Academic presentationAcademic JournalCo-author2010/5/1～Japan Foundry Engineering Society

Academic presentationAcademic JournalSingle-AuthorMARUYAMA,Toru2010/5/1～Japan Foundry Engineering Society

Academic presentationAcademic JournalCo-author2010/5/1～Japan Foundry Engineering Society

Academic presentationUnrefereedOtherCo-authorMARUYAMA,Toru;MIZUTA,Yoshitomo;KOBAYASHI,Takeshi;KOGUSU,Tatsuya;YAN,Hiroharu2010/5/1～

Academic presentationUnrefereedAcademic JournalCo-author2010/3/16～

Academic presentationMARUYAMA,Toru;SATO,Tomohiro;HIRAI,Yoshimasa;KOBAYASHI,Takwshi2010/3/16～

PapersStructure Control and Characteristics of Solidification on Sulfide Dispersed Lead-Free Bronze CastingsIn refereedAcademic JournalCo-authorJournal of Japan Foundry Engineering Society2009/12/25～Japan Foundry Engineering Society

PapersCastability and Cutting Conditions of Sulfide Dispersed Lead Free Bronze CastingsIn refereedAcademic JournalCo-authorJournal of Japan Foundry Engineering Society2009/12/25～Japan Foundry Engineering Society

PapersCasting Structure, Mechanical Properties and Machinability with Changes in Amount of Alloyed Elements of Sulfide Dispersed Lead Free Bronze CastingsIn refereedAcademic JournalCo-authorJournal of Japan Foundry Engineering Society2009/12/25～Japan Foundry Engineering SocietyJapanese

Academic presentationAcademic JournalCo-author2009/12/3～Japan Thermal Spraying Society

PapersUnrefereedAcademic JournalCo-author2009/12/1～

International academic conferenceEffect of Blasting Time and Residual Grit on Adhesion of Thermal Sprayed Coating2009/10/21～2009/10/24The 4th Asian Thermal Spray ConferenceXi’anEnglish

International academic conferenceAcademic JournalCo-author2009/10/1～Japan Foundry Engineering Society

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PapersUnrefereedOtherCo-author2009/7/31～

CommentaryUnrefereedOtherCo-author2009/7/20～

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International academic conferenceSulfide Dispersed Lead Free Copper Alloy CastingsUnrefereedAcademic JournalCo-authorProceedings of 46th Czech Foundry Days1-92009/6/1～2009/6/3Czech Foundrymen SocietyBrnoEnglishLead free copper alloy has been required for particular products, for example, plumbing products, due to harmfulness of lead, and has been developed in many countries. Especially, alloys which contain bismuth have been used as the lead free alloy. However, the properties of the lead free alloy containing bismuth is not enough to provide same properties of conventional copper alloy containing lead. Small deposits of bismuth can be barrier to disperse the alloy. A new type of lead free alloy has been developed to provide allowable properties, such as casting properties, mechanical properties and machinability. Sulfide was focused on for the substitute substance of lead due to lubricant property of sulfide. The way of dispersion of the sulfide in a matrix had been attempted although sulfide density is too small not to separate from a melt during melting. Element additions and controlling sulfur activity had been done to make the sulfide form in castings during solidification. Mechanical properties, casting properties and machinability of the developed alloy were evaluated.Sulfide formed during solidification after developing primary alpha copper dendrite. The sulfide dispersion was observed in the matrix. The microstructure of the sulfide dispersion was confirmed by optical microscope and SEM. Elemental distribution was also investigated by EDX and WDX. The sulfide is mainly copper sulfide. There were few shrinkage cavities due to sulfide dispersion in a part of solidification finish. Mechanical properties of sand castings were above the required value for conventional bronze castings. Machinability showed almost same as the lead containing castings.

Academic presentationAcademic JournalCo-author2009/5/10～Japan Foundry Engineering Society

PapersAcademic JournalCo-author2009/3/25～

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PapersSome Properties of Sulfide Dispersed Lead Free Copper Alloy CastingsAcademic JournalCo-authorT. Maruyama;H. Wakai;H. Abe;T. KobayashiTransactions of American Foundry Society116, 299-3072008/5～

PapersTemperature Measurement in Thermal Decomposition Gas Gap on Evaporative Pattern Casting of Cast IronAcademic JournalCo-authorT. Maruyama;N. Gotoh;T. Nakagawa;T. KobayashiTransactions of American Foundry Society933-9422008/5～

International academic conferenceMachining C87850 (PANEL, Topic : Sulfide Dispersed Copper Alloy Castings)Academic JournalCo-authorT. Maruyama;H. Wakai;H. Abe;T. KobayashiNo.08-1692008/5～112th Metalcasting CongressAtlanta

International academic conferenceEffect of the Blasting Time on the Amount of the Residual Grit on Blasted Steel SubstratesAcademic JournalCo-authorT. Maruyama;T. Miyazaki;T. Kobayashi691-6952008/5～International Thermal Spray Conference and Exposition 2008Maastricht

PapersUnrefereedIn-house publicationCo-author2008/4/1～

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TextbookOtherCo-authorMARUYAMA,Toru2008～

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Research reportOtherSingle-AuthorMARUYAMA,Toru2007/12/11～

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PapersIn-house publicationCo-author2007/11/20～

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International academic conferenceEffect of the blasting angle on the amount of the residual grit on blasted substratesAcademic JournalCo-authorT. Maruyama;K. Akagi;T. Kobayashi2007～International Thermal Spray Conference and Exposition 2007Beijing

International academic conferencePreparation and Properties of Lead Free Copper Alloy Castings with Dispersed Sulfide ParticlesAcademic JournalCo-authorT. Maruyama;H. Wakai;T. Sugitani;H. Nishiuchi;H. Abe;K. Horose;R. Matsubayashi;T. Kobayashi2007～European Metallurgical Conference 2007

International academic conferenceEffect of Zn Contents on Properties of Sulfide Dispersed Lead Free Copper Alloy CastingsAcademic JournalCo-authorH. Wakai;T. Maruyama;T. Sugitani;H. Nishiuchi;H. Abe;K. Horose;R. Matsubayashi;T. Kobayashi2007～European Metallurgical Conference 2007

Research reportIn-house publicationCo-author2007～

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OtherCo-author2006/12～2007/2

PapersEffects of Blasting Parameters on Removability of Residual GritAcademic JournalCo-authorJ. Thermal Spray Technology15, 817－821.2006/12～J. Thermal Spray Technology

Academic presentationAcademic JournalCo-author2006/11/27～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2006/10/1～Japan Foundry Engineering Society

PapersAcademic JournalCo-author2006/8/1～

PapersA spray coating and its mechanical properties of Al－Si－Zn alloy produced by the spray forming processAcademic JournalCo-authorT. Maruyama;T. Kobayashi;M. KanoMaterials Transactions47（7）， 1853－18582006/7/20～Materials Transactions

Academic presentationAcademic JournalCo-author2006/5/1～Japan Foundry Engineering Society

Academic presentationOtherCo-author2006/3～

PapersAcademic JournalCo-author2006/2/25～

Research reportIn-house publicationCo-author2006～

International academic conferenceEffects of blasting parameters on removability of residual gritAcademic JournalCo-author2006～International Thermal Spray Conference and ExpositionSeattle

OtherSingle-AuthorMARUYAMA,Toru2006～

Academic presentationAcademic JournalCo-author2006～Japan Foundry Engineering Society

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Academic presentationAcademic JournalCo-author2005/11/29～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2005/10/11～Japan Foundry Engineering Society

PapersEffect of Sn addition contents and cooling rate on Zinc equivalent of Sn on Cu-Zn AlloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Yuki SakaguchiJournal of Japan Research Institute for Advanced Copper-Base Materials and TechnologiesVol. 44 p. 56-612005/8/1～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesSn are added to brass, for example, the high strength brass, to improve its corrosion resistance. An added Sn is dissolved in the alpha and beta phases, without forming new phase in such case. The phase fraction is changed by Sn addition. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. Though the research on the zinc equivalent was studied by many researchers, the effects of the added element quantity, zinc quantity and the cooling rate are not taken into consideration. In this study, Alloys in the Cu-Zn-Sn system with various Sn and Zn contents were cast in molds of various cooling rate, and the effects of Sn content, Zn content and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations.With an increase in Sn or Zn content, beta phase fraction and the dependence of beta phase fraction on the cooling rate increased. The undercooling of phase transformation from beta to alpha increased with an increase in Sn content. The zinc equivalent of Sn increased with an increase in cooling rate. However, in case of low cooling rate in regardless of quantity of Sn and Zn, the zinc equivalent was a value close to 2.0 shown by Guillet.

PapersEffect of Ni addition contents and cooling rate on Zinc equivalent of Ni on Cu-Zn AlloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Yuki Sakaguchizinc equivalentJournal of Japan Research Institute for Advanced Copper-Base Materials and TechnologiesVol. 44 p. 62-672005/8/1～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesElements are added to brass to improve its the properties, such as toughness, corrosion resistance and abrasion resistance. An added element is dissolved in the alpha and beta phases, without forming new phase, though the phase fraction does change depending on the added element. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. After his study, many results have been reported by other researchers. Though some reports showed approximate values of zinc equivalent by Guillet, values of zinc equivalent of transition element such as Fe or Ni were different between researchers. The effects of the quantity of added element and the cooling rate are not taken into consideration. In this study, Alloys in the Cu-Zn-Ni system with various Ni and Zn contents were cast in molds of various cooling rate, and the effects of Ni content, Zn content and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations. In the case where the Ni content was altered from 1 mass% to 3 mass% and zinc content was taken to be a constant of 38 mass%, the dependence of beta phase fraction on the cooling rate increases. The zinc equivalent of Ni was approximately -1.3, even if Ni content was changed.In the case where the Ni content was fixed to 1 mass% and zinc content was changed from 38 mass% to 42 mass%, beta phase fraction increased with an increase in Zn content. The dependence of beta phase fraction on the cooling rate increases. The zinc equivalent of Ni increased with an increase in cooling rate. However, in case of low cooling rate, the zinc equivalent was a value close to -1.3 shown by Guillet.

Academic presentationAcademic JournalCo-author2005/6/16～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2005/5/9～Japan Foundry Engineering Society

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TextbookOtherSingle-AuthorMARUYAMA,Toru2005～

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International academic conferenceResidual grit on the substrate surface in roughening treatmentAcademic JournalCo-author2005～quantitative evaluation and a reduction technique,International Thermal Spray Conference and ExpositionBasel

International academic conferenceShape of cast iron melt surface and pattern decomposition surface in evaporative pattern casting by using coating of various permeabilityAcademic JournalCo-author2005～Proceedings of the 2nd Japan-Korea Workshop for Young Foundry EngineersJeju Island

Academic presentationAcademic JournalCo-author2004/12/8～

Academic presentationAcademic JournalCo-author2004/9/17～Japan Foundry Engineering Society

CommentaryAcademic JournalCo-author2004/8/20～The Japan Institute of Metals

PapersEffect of Cooling rate on beta Phase Fraction of Cu-Zn AlloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Yuki Sakaguchi;Takeshi KobayashiJournal of Japan Research Institute for Advanced Copper-Base Materials and TechnologiesVol. 43 p. 31-352004/8/2～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesThe (alpha + beta) brass is used widely. Mechanical properties of the alloy are determined by phase fractions of alpha and beta, and so the microstructure control of alpha/beta phases is important. The primary beta phase is partially transformed to alpha by cooling after solidification. Alloyies with different compositions of (alpha + beta) brass were casted, and the relationship between the cooling rate and the undercooling temperatures of the first beta to alpha transformation besides the area fraction of the beta phase were determined. The temperature of the casts were digitally recorded untill 573K. The cooling curves, differential curves, secondary differential curves, and contribution ratio curves were determined. From these curves the phase transformation temperature was specified. The area fraction of beta phase was determined by image analysis of the cast microstructure. Cooling rates were controlled by using several mold materials. The results were as follows: The temperature at the start of the phase transformation from beta to alpha decreased with the cooling rate, and the undercooling temperature of this transformation increased. This tendency becomes remarkable with high zinc content. The beta phase fraction increases with cooling rate and zinc content. There was a liner relation between the square root of the cooling rate and the beta phase fraction. This tendency was remarkable with a high zinc content.The temperature at the start of the phase transformation from beta to alpha decreased with the cooling rate, and the undercooling temperature of this transformation increased. This tendency becomes remarkable with high zinc content. The beta phase fraction increases with cooling rate and zinc content. There was a liner relation between the square root of the cooling rate and the beta phase fraction. This tendency was remarkable with a high zinc content.

PapersEffect of Si Content and Cooling Rate on beta Phase Fraction in Cu-Zn AlloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Yuki Sakaguchi;Takeshi KobayashiJournal of Japan Research Institute for Advanced Copper-Base Materials and TechnologiesVol. 43 p. 36-412004/8/2～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesElements are added to brass to improve its the properties, such as toughness, corrosion resistance and abrasion resistance. An added element is dissolved in the alpha and beta phases, without forming new phase, though the phase fraction does change depending on the added element. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. Though the zinc equivalent has been used as an index for microstructure control for many years, the effects of the quantity of added element and the cooling rate are not taken into consideration. In this study, the effects of the amount of added element and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations. Alloys in the Cu-Zn-Si system with various Si and Zn contents were cast. In the case where the Si content was altered, the apparent zinc content calculated by Guillet's conversion equation was taken to be a constant. In this calculation, the zinc equivalent of Si was set to 10, and the obtained results were as follows. When the Si content was changed, the beta phase fraction increased with an increase in the cooling rate. However, no such tendency was found when increasing the Si content. This increase in Si content reduced the predictability of the cooling rate. Although the zinc equivalent of Si increased with an increase in the cooling rate in the case of a low Si amount, it remained constant regardless of the cooling rate in case of a high Si content.When the Si content was fixed, the beta phase fraction increased with an increase in zinc content. In this case, however, the change in the beta phase fraction was almost constant, even when the cooling rate increased. Moreover, the increase in zinc content raised the silicon's zinc equivalence. However, the zinc equivalent of Si did not actually change, even when the cooling rate increased. In this experiment, zinc equivalent of Si was less than 10 in all samples.

Academic presentationAcademic JournalCo-author2004/6/17～Japan Thermal Spraying Society

BookMonographCo-author2004/4/30～

Academic presentationAcademic JournalCo-author2004/4/30～Japan Foundry Engineering Society

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International academic conferenceInfluence of substrate surface roughness on adhesive property of sprayed coatingAcademic JournalCo-author2004～　International Thermal Spray Conference and Exposition, Characterization methodsfor coating properties 1―6Osaka

PapersCharacterization of Pure Aluminum and Zinc Sprayed Coatings Produced by Flame SprayingIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Masatoshi Kanothermal analysis curve;tensile strength;sprayed coating;spray forming;shrinkage property;pure zinc;pure aluminum;flame sprayingMATERIALS TRANSACTIONSVOL.44 No.122003/12/20～The Japan Institute of MetalsWe investigate flame spraying of pure aluminum and pure zinc powders on various different substrates and study shrinkage properties and thermal analysis curves of sprayed coatings during the forming process. We also examined effects of the spray distance on the porosity, tensile strength and hardness of sprayed coatings, and obtained the following results. With an increase in spray distance, shrinkage of the sprayed coating and the maximum temperature in the thermal analysis curve decrease. When the cooling ability of the substrate is higher, the shrinkage ratio and the maximum temperature become decrease. The porosity and the hardness of a sprayed coating increase with an increase in spray distance. This occurs because with the increase in the spray distance, the temperature of the sprayed particles decreases, the amount of air taken in the spray increases and, as a result, the cooling rate of the coating increases. The tensile strength of a pure aluminum coating decreases with an increase in spray distance due to the introduction of pores. On the contrary, the tensile strength of a pure zinc coating increases with an increase in spray distance. This occurs because when the spray distance is short, coating temperature is high and, as a result, a large quantity of zinc oxide is formed.Kansai University Research Grants 20020401-20030331

CommentaryIn-house publicationSingle-AuthorMARUYAMA,Toru2003/11/30～

PapersThermal Decomposition Behavior of Expandable Pattern Including Blended Metal or Alloy Powder in Evaporative Pattern Casting Process of Cast IronIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashiexpandable polystyrene;expandable pattern;exothermic reaction;exothermic dissolution;evaporative pattern casting process;cast iron;alloy powder;accelerationMATERIALS TRANSACTIONSVOL.44 NO.112003/11/20～The Japan Institute of MetalsMetal or alloy powder capable of exothermic reaction with cast iron melt was blended into expandable polystyrene patterns. The behavior of thermal decomposition of the expandable patterns in evaporative pattern casting of cast iron was investigated. In evaporative pattern casting in which patterns including blended powder of metallic Si, Fe-Si alloy, Fe-Si-Mg alloy, or Fe-Si-Ca alloy were used, the temperature of the melt was higher than that in casting with original non-blended patterns. When the blending ratio was increased, the volume and pressure of decomposition gas during casting process were increased and, on the other hand, the filling rate of the melt was reduced. The use of patterns blended with powder caused no defect and abnormal structure in castings. These results imply that blending of metal or alloy powder into a pattern accelerates thermal decomposition of the pattern.

PapersThermal Decomposition Behavior of Expandable Pattern Including Blended Metal or Metal Oxide Powder in Evaporative Pattern Casting of Al-Si System AlloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashioxide powder;expandable polystyrene;expandable pattern;exothermic reaction;exothermic dissolution;evaporative pattern casting process;aluminum alloy;accelerationMATERIALS TRANSACTIONSVOL.44 NO.112003/11/20～The Japan Institute of MetalsWe investigated thermal decomposition behavior of expanded patterns including thermal decomposition accelerators such as Ni, NiO, CuO and Cu2O (hereinafter referred to as ”powder-blended expanded patterns”) in an aluminum alloy evaporative pattern casting process; the following results were obtained. When these metal or metal oxide powders were blended in EPS (expandable polystyrene) patterns, an exothermic reaction occurred between metal or metal oxide powder and aluminum alloy melt. This reaction prevented, temperature drop at the top of the melt flow. In addition, these kinds of powder accelerated pattern thermal decomposition. As a result, the pattern thermal decomposition gas volume increased and aluminum alloy melt filling decreased.

Academic presentationAcademic JournalCo-author2003/10/3～Japan Foundry Engineering Society

PapersMachinability of Pb free Cu-Zn system alloy in which Si system compound dispersedIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Kazuyoshi Nakao;Youtarou Murakamichip size;machinability;metallic compound;free cutting brass;lead free brass2003/8/1～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesFree cutting brass containing lead has excellent machinability. However, the intake of the lead is harmful to the human body. Therefore development of lead free material is required. Lead free brasses containing silicon system intermetallic compound were cast and were examined machinability. The results were as follows. Lead free brasses as Cu-Zn-Mg-Si alloy and Cu-Zn-Mg-Si-Mn alloy were cast. The intermetallic compound of Cu5Mg2Si formed in Cu-Zn-Mg-Si alloy during solidification and after solidification. Beta phase fraction in matrix structure increase with addition of Mg and Si. The quantity of the compound increase with increasing contents of Mg and Si. Form of the compound became like eutectic structure when Mg and Si contents were too much. Because of addition of Mg and Si to brass, chip size became small and hardness increased. Chips curl up in small pieces. When copper content increase, alpha phase fraction increased and intermetallic compound of Cu5Mg2Si was distributed on boundary of alpha and beta phase. Furthermore, eutectic structure did not form even if contents of Mg and Si were much. In this case, chip size became more small and the hardness decrease.When manganese was added to Cu-Zn-Mg-Si alloy, Mn5Si3 formed. The compound uniformly dispersed. Chip size of Cu-Zn-Mg-Si-Mn alloy was smaller than that of Cu-Zn-Mg-Si alloy.

PapersInfluence of zinc vapor pressure on disperse composite of fine graphite particle in Cu-Zn system alloyIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Kazuyoshi Nakao;Youtarou Murakamiadhesion and capture;zinc vapor bubble;float and separation;lead free brass;zinc vapor pressure;graphite particle2003/8/1～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesZinc quantity on Cu-Zn-Ti alloy was made to change within 25 to 40 mass% in the alloy. The fine graphite particle was agitated and added in the alloy melt. The results were as follows. The graphite area fraction was almost fixed regardless of the zinc content, even if the zinc content change, when the vapor pressure of zinc was fixed. The graphite particle adhered and caught to the zinc vapor bubble when the vapor pressure of zinc rises. It was guessed that the graphite particle surface and separate from melt because of this phenomenon. The formation mechanism of the zinc vapor bubble was considered as following. The cavitation occur behind the impeller when Cu-Zn alloy melt is stirred with the impeller, and the small bubble forms in the cavitation. Therefore, the small bubble grew into large by gathering and uniting.

PapersStructure and machinability on hot extrusion material of Pb free Cu-Zn system alloy which dispersed fine graphite particlesIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Kazuyoshi Nakao;Youtarou Murakamienrichment;cohesion;machinabillity;indirect extrusion;direct extrusion;graphite particle2003/8/1～Japan Research Institute for Advanced Copper-Base Materials and TechnologiesThe melting of the lead free free-cutting brass in which the fine graphite particle dispersed was tried, and the alloy was cast in the permanent mold. The hot direct and indirect extrusion were carried out for the casting billet. Results of structure and machinabillity of obtained extrusion lots are as follows. (1) The creak of ”a check” had occurred on the surface of the lot in the direct extrusion. It was known that graphite particles coheres and enriches by the plastic flow of the alloy in the ring on the lot circumference. (2) On the indirect extrusion, the tendency in which the graphite particle reversely cohered in center part on lot cross section was recognized. (3) It was known that the distribution density of graphite particle at the lot greatly influenced machinabillity.

PapersSliding Properties of Composite Sprayed Coating between Bronze Powder and Solid LubricantIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashi;Tsutomu Yasudawear test;solid lubricant;sliding property;powder flame spraying;lead free material;copper base alloy;composite spraying;composite coating;calcium fluorideMATERIALS TRANSACTIONSVol. 44 No.5 Page 1024-10282003/5/20～The Japan Institute of MetalsIntake of lead is harmful to the human body. Therefore, it is necessary to substitute other alloying elements for lead in Cu alloys. Using a Cu-9.5mass%Sn alloy powder and CaF2, which has sliding properties equal to lead, a composite sprayed coating (by flame spraying) was developed. The results were as follows. A composite sprayed coating with the desired characteristics was successfully produced. The area fraction of the CaF2 layer in the composite coating increased with the increase in the blend ratio of CaF2 in the blended powder. The wear resistance of the composite coating containing CaF2 was excellent. As a result it was determined that CaF2 in the composite coating was effective as a sliding material substitute for lead.

Academic presentationAcademic JournalCo-author2003/5/2～Japan Foundry Engineering Society

Academic presentationIn-house publicationCo-author2003/3/31～

PapersCarbon pickup phenomenon of Fe-C system alloys in the evaporative pattern casting processIn refereedAcademic JournalCo-authorMARUYAMA Toru;Kobayashi Takeshihigh chromium;gas gap;formed pattern;expandable polystyrene;EPC;cast steel;carbon pickup phenomenon;cast ironJournal of Japan Foundry Engineering SocietyVol. 75, No.2, Page 130-1362003/2/25～Japan Foundry Engineering SocietyThe Carbon pickup phenomenon in the evaporative pattern casting process was investigated using hypoeutectic cast iron, spheroidal graphite cast iron, cast steel and high chromium cast iron as the Fe-C system alloys. The carbon pickup phenomenon occurred due to the thermal decomposition products in the front of the melt flow. When the distance of the melt flowed was 100 mm, the carbon pickup ratio of hypoeutectic cast iron and high chromium cast iron showed almost the maximum value. The carbon pickup ratio rises, as it is smaller for the carbon equivalent of molten cast iron. In particular, the carbon pickup ratio in the cast steel was remarkably high. Conversely, in the molten spheroidal graphite cast iron with the hypereutectic composition the carbon pickup phenomenon did not occur. The carbon pickup ratio increased with an increase in the blended ratio of EPS in the foamed pattern on the hypoeutectic cast iron.20000401-20030331

PapersSurface conditions of substrate and adhesive property of sprayed coatingIn refereedAcademic JournalCo-authorMARUYAMA Toru;Takeshi Kobayashiultrasonic cleaning;alumina grit;surface roughness;flame spraying;polishing;blasting;adhesive propertyJournal of Japan Thermal Spraying SocietyVol. 39, No.4, Page 144-1492002/10/31～Japan Thermal Spraying SocietyThough the adhesion between substrate and sprayed coating seems to be mainly due to the anchoring effect, quantitative examinations have not been sufficient. In this paper, the surface condition of a roughened substrate is quantitatively evaluated using a surface roughness tester, and the adhesive relationship is clarified. Substrate used was S45C carbon steel, and the roughening methods were blasting and endless belt polishing with alumina grit, in various roughening conditions. A pure copper coating was formed using the powder flame spraying method on roughened substrate. The drawing adhesion strength test method was used to evaluate the adhesive properties. The adhesive strength is reduced, though the surface roughness of the substrate increases, as the size of the grid particles for roughening increase. The alumina grits remained on the substrate after roughening, and they were removed by ultrasonic cleaning. Though there is no relation between the adhesive strength and the ratio of the increase in the surface area of substrate due to the roughening treatment, it is recognized that the adhesive strength also increases when the roughness gradient of the substrate increases.Kansai University Research Grants 20020401-20030331

Academic presentationAcademic JournalCo-author2002/10/6～Japan Foundry Engineering Society

Academic presentationAcademic JournalCo-author2002/6/20～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2002/5/24～Japan Foundry Engineering Society

Research reportIn-house publicationCo-author2002/3～

Academic presentationAcademic JournalCo-author2001/10/19～Japan Foundry Engineering Society

Academic presentationAcademic JournalCo-author2001/6/20～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2001/4/25～Japan Foundry Engineering Society

Academic presentationAcademic JournalCo-author2000/11/21～Japan Thermal Spraying Society

Academic presentationAcademic JournalCo-author2000/9/25～Japan Foundry Engineering Society

Academic presentationAcademic JournalCo-author2000/9/1～The Iron and Steel Institute of Japan

Research reportIn-house publicationCo-author2000/8/31～

Academic presentationAcademic JournalCo-author2000/6/23～Japan Thermal Spraying Society

PapersEffects of Carbon and Ferrite-stabilizing Elements on Austenite Grain Formation for Hypo-peritectic Carbon SteelIn refereedAcademic JournalCo-authorMARUYAMA Toru;Masayuki Kudoh;Yohichi Itohunidirectional solidification;stabilizing element;phase transformation;peritectic reaction;grain size;grain formation;dendrite arm spacing;cast steelTetsu-to-Hagane2000/2/1～The Iron and Steel Institute of JapanIn order to investigate the formation process from

dendrite to

grain in a hypo-peritectic carbon steel, an unidirectionally solidifying carbon steel sample is quenched from a temperature above the solidus temperature. Three zones of primary dendrite, fine columnar grain and coarse columnar grain are observed in the sample. The dendritic zone consists of (L+

) phase, the fine columnar grain is both phases of (L+

) and (

), and the coarse columnar grain is

phase. The width of the fine columnar grain agrees with the primary arm spacing of the

dendrite and it is the same result as that for a hyper-peritectic carbon steel. The

grain boundary in the zone of the fine columnar grain forms at the skeleton of the

dendrite, while that for a hyper-peritectic carbon steel forms at the position between the

dendrites. Since transition from the fine columnar grain to the coarse one occurs immediately after the disappearance of

phase, the

phase prevents the coarsening of the fine columnar grain. A length of the zone of the fine columnar grain decreases with increasing carbon concentration. The length extends according to the addition of ferrite-stabilizing elements. The extended effect becomes stronger in the sequence of Nb>V>Mo, while Ni as an austenite-stabilizing element have no influence on the length.

PapersFormation of austenite grain in hypo-peritectic carbon steels.In refereedAcademic JournalCo-authorMARUYAMA,Toru;KUDOH,Masakazu;ITO,Yoichi2000～

Academic presentationEffect of Solute Elements on the Formation of Austenite Grain for Hypo-Peritectic Steel.Academic JournalCo-author1999/9/1～The Iron and Steel Institute of Japan

PapersPeritectic Transformation and Austenite Grain Formation for Hyper-peritectic Carbon SteelIn refereedAcademic JournalCo-authorMARUYAMA Toru;Kiyotaka Matsuura;Masayuki Kudoh;Yohichi Itohsegregation;phase transformation;peritectic reaction;grain growth;directional solidification;dendrite arm spacingTetsu-to-Hagane1999/8～The Iron and Steel Institute of JapanThree binds of solidifying regions, (L+

), (L+

) and (L+

) have been observed in an unidirectional solidified hyper-peritectic steel sample quenched from a temperature above the solidus temperature. The primary

-phase in the (L+

) region solidifies to a dendritic structure, and the fine columnar

grains are exist in the boundary part of the (L+

) region near to the (L+

). The columnar shape of the fine

grains is caused by the shape of

-dendrite. A transition from the fine

grains to coarse columnar

grains occurs in the (L+

) region when a volume fraction of liquid lowers. The structure of coarse columnar

grain have no relation with dendrite structure. The fine columnar

grains disappear as a result of growth of coarse columnar

grain. The measured temperature ranges for the (L+

) region agree with those calculated under a non-equilibrium condition. The end temperatures of peritectic reaction and solidification calculated are somewhat lower than the equilibrium temperatures, and are independent of solidification rate.

Academic presentationTransition from delta Dendrite to Austenite Grain for Peritectic Steel.Academic JournalCo-author1998/9～The Iron and Steel Institute of Japan

PapersEvaporation Rate of Copper from Molten Iron by Urea Spraying under Reduced PressureIn refereedAcademic JournalCo-authorMARUYAMA Toru;Hiroshi G.Katayama;Tadashi Momono;Yoshinori Tayu;Tomoo Takenouchiaccelerative evaporation;reduced pressure;urea spraying;copper removal;iron scrap;secondary steelmakingTetsu-to-Hagane1998/4/1～The Iron and Steel Institute of JapanExperiments were done by spraying urea (NH2CONH2) as its pyrolysis gases at the intervals of 5min onto molten iron containing 0.4 mass% Cu at 1600

under reduced pressure. If urea amount per each spraying was more than 0.4g, the molten iron was suddenly splashed and slopped over the top of crucible during the experimental run, so that 0.3g of urea was sprayed in the subsequent experiments. Nitrogen concentration of the molten iron increased with increasing the number of urea spraying and the pressure of gas phase. It was 5 to 8 times higher than the concentration in equilibrium with nitrogen gas. The following relationships were found between the rate constant (k) of copper evaporation and the pressure (P in Pa) : In the case of urea spraying, log k = - log P - 0.762 ; without urea spraying, log k = -log P - 0.996. These results show that even in thecase of urea spraying the evaporation rate of copper was controlled by mass transfer through gaseous film on the surface of the molten iron. It was concluded that acceleration of copper evaporation by urea spraying may be mainly due to the evaporation as Cu(N3)2 which has higher vapor pressure than metallic copper.The evaporation rate of copper somewhat decreased in the case of the molten iron containing 0.34 mass% C, because some part of urea was probably consumed by the formation of iron cyanide. Sulfur had little influence on the evaporation rate.

Academic presentationDevelopment of Austenite Grain for Hyper-Peritectic Carbon Steel.Academic JournalCo-author1998/3～The Iron and Steel Institute of Japan

PapersAccelerative Evaporation Mechanism of Molten Pure Copper and High Carbon Iron by Urea AdditionIn refereedAcademic JournalCo-authorMARUYAMA Toru;Hiroshi G. Katayama;Tadashi Momonoaccelerative evaporation;urea addition;molten high carbon iron;molten copper;iron scrapTestu-to-Hagane1998/2/1～The Iron and Steel Institute of JapanIn order to obtain the fundamental information concerning accelerative evaporation of copper dissolved in molten steel with ammoniacal compound, experiments were done by adding urea onto molten pure copper and high carbon iron containing 0.4%Cu at 1150

to 1450

under an argon atmosphere. Evaporated amount of the molten copper increased with the increase of urea amount. At constant urea amount, it increased with increasing temperature at 1150

to 1250

, while it become constant above 1250

. Based on the mass balance of evaporated copper to added urea, it was concluded that the molten copper was evaporated as Cu(N3)2 and this compound decomposed to liberate copper immediately after evaporation.In the case of high carbon iron containing 0.4%Cu, iron was preferentially evaporated, so that copper was concentrated in the molten iron. At constant urea amount, evaporated amount of the molten iron increased abruptly with increasing temperature up to 1250

, while it reached almost constant value at 1250

to 1300

. After again increasing at 1300

to 1350

, it remained unchanged above 1350

. X-ray diffraction analysis showed that the matter entrapped from exhaust gas was composed of graphite, Fe3C and Fe3N. Based on this result and the mass balance, it was concluded that the high carbon iron was evaporated as Fe(CN)3 below 1300

and Fe(CN)2 above 1350

Academic presentationEvaporation Rate of Copper from Liquid Iron by Urea Spraying under Reduced Pressure.Academic JournalCo-author1997/9～The Iron and Steel Institute of Japan

Academic presentationAccelerative Evaporation of Copper from Molten Steel by Urea Spraying under Reduced Pressure.Academic JournalCo-author1997/3～The Iron and Steel Institute of Japan

Academic presentationEvaporation Behavior of Molten Copper and Pig Iron by Urea Additon.Academic JournalCo-author1995/11～The Iron and Steel Institute of Japan

MARUYAMA, Toru