Kyushu University [Hirofumi Miyahara (Professor) Faculty of Engineering, Department of Materials Science and Engineering]

Department of Materials Process Engineering
Graduate School of Engineering

Department of Materials Science and Engineering
School of Engineering

092-802-2990

Dr. of Engineering

Solidification and Crystal Growth of metals and composites

---Research--

○Analysis of crystal growth mechanism for facetted grew crystal
1.Growth anisotropy of high purity silicon crystal
2.Analysis of crystal orientation control of multi-crystal solar cell

○Microstructure control and evaluation of characteristics for iron based alloy for casting
1.Microstructure control of high alloyed white cast iron
2.Evaluation of solute distribution for high alloyed cast iron

○Microstructure control and evaluation of characteristics for alloy particle for thermal spray processing
1.Influence of cooling rate on microstructure of iron alloy
2.Influence of alloy element on particle
3.Abrasion resistance evaluation

○Microstructure control and evaluation of characteristics of non-ferrous iron for casting
1.Influence of alloy element on microstructure of magnesium alloys
2.Behavior analysis of molten metal in mold by fluid flow simulation
3.Evaluation of abrasion resistance and fatigue characteristics

○Microstructure control and evaluation of characteristics of composite materials
1.Analysis of crystal morphology and phase selection among fibers
2.Aging characteristic of composite materials and relation of TEM microstructure
3.Evaluation of abrasion resistance and fatigue characteristics

○Crystal growth analysis in liquid state fabrication
1.Crystal growth among plates or fiber space
2.Thermal and solute diffusivity on crystal growth in micro area and its simulation
3.Evaluation and natural convection on crystal growth

--Education--
○For graduate student
1.Composite materials---Lecture concerning design, processing and control of composite materials
2.Control of crystal growth---Lecture concerning distribution of alloying element on crystal growth for alloys
3.Practice of process engineering II A ---Practice concerning design and evaluation of the material that manufactured by the liquid state fabrication

○For Undergraduate student
1.Solidification and crystalline growth---Lecture concerning microstructure formation process for alloy, semiconductor, and ceramics
2.Joining and composite engineering---Lecture concerning process of welding and composite materials.
3.Practice of material science ---Experiment and maneuver of crystal control and evaluation of solidified material by liquid state fabrication
4.Material science outline--- Lecture concerning manufacturing process, microstructure control, and evaluation of characteristics of material. such as car, airplane, ships, and rockets.
5.Core seminar ---Experiment, creation, and creativity, leadership, and communications concerning material science

Research Interests

Microstructure Control of Particle Alloy for Thermal Spray
keyword : solidification, Thermal spray, wear resitance, microsegragation
2008.04.
Microstruture of Nickel base super alloys
keyword : simulation, macro segregation
2004.04.
Microstructure development through the solidification processing and its application for structural materials
keyword : liquid state fablication, computer simulation, macro scopic segregation, hardness, solidification
2006.04.
fluid flow mechanizm
keyword : fluid flow
2009.02.
Development of High Wear Resistant Cast Iron for Rolls
keyword : solidification, hardness, friction resitance, cast iron, carbon, carbide
2006.04.
Analysis of Mechanism of Crystal Growth fro Multicrystal Silicon Ingot for Solar Battery
keyword : multicrystal, silicon, solar battery, unidirectional solidification, colomnar structure
2002.04.
Microstructural Control of Ceramic Reinforced Metals by the Solidification Processing
keyword : composites, dislocation, ceramics, diffusivity,
1994.04.
computer simulation for crystal growth of metal matrix composites
keyword : composites, thermal diffusion, cast, simulation, wear resistant, micro segregation
1997.04～2009.03.

Current and Past Project

「High speed crystallization for high densely packed onion type graphite」
「」
Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated.
Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated.
Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique. Reducing the undercooling dew to the twin growth can explain the reasons of increasing the gain size.
Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated. The model of two dimensional nucleation on the reentrant corner is established and their critical nucleation radiuses are calculated from 70 to 80 % of radius of general two-dimensional nucleation. Reducing the undercooling dew to the twin growth can explain the reasons of increasing the gain size.

Academic Activities

Reports

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1.	Introduction of solidification processing.
2.	Introduction of solidification processing 2.
3.	Introduction of solidification processing 1.
4.	Alloy Design and Carbides Control for Rolls of Continuous Casting.

Papers

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1.	Fractal Analysis of Solidification Microstructure of High Carbon High Alloy Cast Roll Manufactured by Centrifugal Casting Masahiro YAMAMOTO, Ichihito NARITA and Hirofumi MIYAHARA.
2.	Analysis of Distribution of Casting Defect and Feeding Effect in ADC12 Alloy Die Casting Part Masafumi HAMASAKI, Hirofumi MIYAHARA.
3.	Solidification Microstructure and Criteria Conditions of Shrinkage Porosity in Die Casting Process of ADC12 alloy Masafumi HAMASAKI, Hirofumi MIYAHARA.
4.	Ichihito Narita, Yohei Fuchigami, Takashi Uchino, Muhammad Fahmi and Hirofumi Miyahara,Microstructure control of polycrystalline silicon ingots by vibrating unidirectional solidification method,Proceedings of The 4th Korea-Japan Conference for Young Foundry Engineers ,pp.118,pp. 118,2011.11.
5.	Takashi Uchino, Ichihito Narita and Hirofumi Miyahara,Control of initial solidification microstructure of polycrystalline silicon ingot for high-efficiency solar cell,Proceedings of The 4th Korea-Japan Conference for Young Foundry Engineers ,pp.43,pp. 43,2011.11.
6.	Ichihito Narita, Yohei Fuchigami, Yusuke Nakamura, Takashi Uchino, Masami Kamezaki, Chikara Ishibashi and Hirofumi Miyahara,Effects of vibrating unidirectional solidification on microstructure of polycrystalline silicon ingots,Proceedings of The 13th International Symposium on Materials Science and Engineering among Chonbuk National University, Harbin University and Kyushu University,2011.10.
7.	Influence of V and Ta on solidification microstructure and quench / temper hardness in high carbon high speed steel type cast iron Soichi SAKAMOTO, Hirofumi MIYAHARA, Ichihito NARITA, Kazunori KAMIMIYADA and Keisaku OGI .
8.	Introduction of solidification processing 2 Hirofumi MIYAHARA.
9.	Introduction of solidification processing 1 Hirofumi MIYAHARA.
10.	H. Miyahara,Evaluation of Macroscopic Distribution on Oxide Inclusion for Nonflammable Mg Cast Alloy,International Symposium on Cutting Edge of Computer Simulation of Solidification and Casting,pp.29,2010.02.
11.	S. Sakamoto, H. Miyahara, Sergio Villanueva Bravo, K. Yamamoto, K. Kamimiyada, K. Ogi,The Influence of V and Ta on Microstructual Development for High Speed Steel Roll,International Symposium on Cutting Edge of Computer Simulation of Solidification and Casting,pp.93-94,2010.02.
12.	H. Miyahara, Sergio Villanueva BRAVO, K. Yamamoto and K. Ogi,Solute Concentration and Carbides Formation for Steel Milling Rolls, ISIJ International,Vol.49,No.7,pp.1075-1079,vol.49(7), pp.1075-1079,2009.07.
13.	Alloy Design and Carbides Control for Rolls of Continuous Casting Materials Science and Technology, Vol.79(1), pp.8-14, January 2009.
14.	V. Sergio, S. Ishikawa, K. Yamamoto, H. Miyahara,K. Ogi,K. Kamimiyada,Control of Graphite Formation in Solidification of White Cast Iron,International Journal of Cast Metals Research,pp.27-30,2008.08.
15.	K. Sakata, S. Fujita, H. Miyahara and K. Ogi,Effects of Diffusion Treatment on the Interface Microstructure between Thermally Sprayed Cobalt-based Self-fluxing Alloy Coating and Steel Substrate,Thermal Spray 2008,pp.684-688,(2008), 684-688,2008.10.
16.	T. Noguchi, K. Asano, S. Hiratsuka , H. Miyahara,Trends of Composite Casting Technology and Joining Technology for Castings in Japan,International Journal of Cast Metals Research,vol.21(No.1-4), pp. 219-225.,2008.08.
17.	Seiko Nara, Toshio Ishii, Hirofumi Miyahara and Keisuke Ogi,Measurements and Analysis of Molten Silicon Temperature and Flow in Solidification Process of Solar Silicon,J of JSEM, vol.8 (2008) 133-137.,2008.06.
18.	Effect of Surface Texture and Nitriding on Galling Properties in Materials Used for Press-roming Tools.
19.	V. Sergio, S. Ishikawa, K. Yamamoto, H. Miyahara,K. Ogi,K. Kamimiyada,Control of Graphite Formation in Solidification of White Cast Iron,Proceedings of 10th Asian Foundry Congress,pp.164-167,2008.05.
20.	V. Sergio, K. Yamamoto, H. Miyahara, F. Seo, K. Kamimiyada and K. Ogi,Distribution of Carbides and Graphite for Ni-hard Type Cast Iron,Proceedings of 10th Asian Foundry Congress,pp.174-179,2008.05.
21.	T. Noguchi, K. Asano, S. Hiratsuka , Miyahara,Trends of Composite Casting Technology and Joining Technology for Castings in Japan,Proceedings of 10th Asian Foundry Congress,pp.260-266,2008.05.
22.	S.M. Seo, I.S. Kim, J.H. Lee, C.Y. Jo, H. Miyahara and K. Ogi,Grain Structure Control during Single Crystal Solidification of Ni-Base Superalloy,Proceedings of 10th Asian Foundry Congress,pp.406-413,2008.05.
23.	Simulation of Gas Gap Formation between Substrate Surface and Molten Steel During Initial Solidification Masafumi MIYAZAKI and Hirofumi MIYAHARA .
24.	Seong-Moon Seo, In-Soo Kim, Je-Hyun Lee, Chang-Yong Jo, Hirofumi Miyahara, and Keisaku Ogi,Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf,Journal of Materials Science and Technology,24(1), pp.110-114,2008.01.
25.	Nader El-bagoury, Adel Nofal, Kauro Yamamoto, Hirofumi Miyahara and Kiesaku Ogi,Contribution to the Development of Rhenium Alloyed Inconel 718 Alloy,Proceedings of 12th International Conference on Aerospace Sciences and Aviation Technology,2007.12.
26.	Kazunori Sakata, Kosuke Nakano, Hirofumi Miyahara, Yasuhiro Matsubara and Keisaku Ogi,Microstructure Control of Thermally Sprayed Co-Based Self-Fluxing Alloy Coatings by Diffusion Treatment,J. of Thermal Spray Technology ,vol.16, No.5-6, pp.991-997,2007.12.
27.	Sergio Villanueva Bravo, Kaoru Yamamoto, Hirofumi Miyahara and Keisaku Ogi,Control of Carbides and Graphite in Ni-hard Type Cast Iron for Hot Strip Mills ,Materials Science Forum, vol.561-565, pp.1023-1026,2007.11.
28.	Seiko Nara, Toshio Ishii, Hirofumi Miyahara and Keisuke Ogi,Measurements and Analysis of Molten Silicon Temperature and Flow in Solidification Process of Solar Silicon ,2nd International Symposium on Advanced Fluid / Solid Science and Technology in Experimental Mechanics,2007.09.
29.	Hirofumi Miyahara, Yusuke Nakamura, Ichihito Narita and Keisaku Ogi,Influence of Crystal Orientation on Growth Velocity of Polycrystalline Silicon for Solar Cells ,Proceedings of Modeling of Casting and Solidification Processes Ⅶ,pp.281-287,2007.08.
30.	Hirofumi Miyahara, Takeuchi Hirohisa, Nader El-Bagoury, Kozo Wakasugi, Kaoru Yamamoto1 and Keisaku Ogi,Influences of Solidification and Thermal Treatment on Mechanical Properties of Nickel Base Superalloy, Inconel 718,Proceedings of the Asian Foundry Congress 2007,2007.05.
31.	Seong-Moon Seo, In-Soo Kim, Je-Hyun Lee, Chang-Yong Jo, Hirofumi Miyahara, and Keisaku Ogi,Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf,Proceedings of the Asian Foundry Congress 2007,2007.05.
32.	Seong-Moon Seo, In-Soo Kim, Je-Hyun Lee, Chang-Yong Jo, Hirofumi Miyahara, and Keisaku Ogi,Eta Phase and Boride Formation in Directionally Solidified Ni-Base Superalloy IN792+Hf,Metallurgical and Materials Transactions A,vol. 38A, No.4, pp.883-893,2007.04.
33.	Tatsujiro Miyazaki, Hiroshi Noguchi, Hirofumi Miyahara and Yuta Aono: Examination of Fatigue Characteristics of Aluminum Cast Alloy from Meso-level Construction (3rd Report, Prediction of the Fatigue Limit Reliability of Notched Specimen of Metal Containing Different Sorts of Inhomogenities under R = -1),Transaction of the Japan Society of Mechanical Engineers.
34.	Influence of Notch Size and the Solidification Microstructure on the Rotating Bending Fatigue Characteristics of SiC Particle-Reinforced AC4B Alloy Composites Yusaku Maruno Naoya Mimura Hirofumi Miyahara and Keisaku Ogi J. Japan Inst. Metals Vol.70 7(2006)pp.554-561..
35.	Hirofumi Miyahara Seiko Nara and Keisaku Ogi,Effect of Reentrant Twin Corners on Directional Solidification of Polycrystalline Silicon,Proc. of World Conference on Photovoltaic Energy Conversion,pp.1219-1222.,2006.05.
36.	Hirofumi Miyahara Takafumi Nakashima Kozo Wakasugi Seiko Nara and Keisaku Ogi,Solidification Conditions at the Early Stages for Grain Control of Polycrystalline Silicon Ingot,Proc. of World Conference on Photovoltaic Energy Conversion,pp.1223-1226.,2006.05.
37.	Hirofumi Miyahara, Yusaku Maruno, Yoshinori Nishihata and Keisaku Ogi,Influences of Reinforcements on Solidification Microstructure and Fatigue Property for Cast Aluminum Alloy Composites,Transactions of The Indian Institute of Metal,Vol.59 No.2 pp.255-261,2006.02.

Presentations

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Awards

The paper titled "Microstructure Control of Thermally Sprayed Co-Based Self-Fluxing Alloy Coatings by Diffusion Treatment" was selected to Best Paper Award 2007 in J. of Thermal Spray Technology
「Effective Collaboration of Elementary School and University Students for the Development of Creativity by Casting and Designing」

Educational Activities

(1) Composite materials---Lecture concerning design, processing and control of composite materials
(2) Control of crystal growth---Lecture concerning distribution of alloying element on crystal growth for alloys
(3) Analysis of interfaces ---Lecture concerning evaluation and application of interface phenomena from physical, chemical point of view

< Education for undergraduate student>
(1) Solidification and crystalline growth---Lecture concerning microstructure formation process for alloy, semiconductor, and ceramics
(2) Joining and composite engineering---Lecture concerning process of welding and composite materials.
(3) Practice of material science ---Experiment and maneuver of crystal control and evaluation of solidified material by liquid state fabrication
(4) Material science outline--- Lecture concerning manufacturing process, microstructure control, and evaluation of characteristics of material. such as car, airplane, ships, and rockets.
(5) Core seminar ---Experiment, creation, and creativity, leadership, and communications concerning material science