Kyushu University Academic Staff Educational and Research Activities Database
Researcher information (To researchers) Need Help? How to update
Hirofumi Miyahara Last modified date:2024.01.04

Professor / Metals Science for Structural Materials
Department of Materials Science and Engineering
Faculty of Engineering


Graduate School
Undergraduate School
Other Organization


E-Mail *Since the e-mail address is not displayed in Internet Explorer, please use another web browser:Google Chrome, safari.
Homepage
https://kyushu-u.elsevierpure.com/en/persons/hirofumi-miyahara
 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Dr. of Engineering (Kyushu University, Japan)
Field of Specialization
Solidification and Crystal Growth
Outline Activities
The solidification and crystal growth (melt growth) for metals, semiconductors and ceramics are developed and lectured in this laboratory.

---Research--
○Analysis of rapid solidification microstructure
1. Creation of structural or functional materials by 3D printer
2. Control of rapid melt – solidified microstructure using a selective laser melting

○Analysis of crystal growth mechanism for facetted grew crystal
1.Analysis of crystal orientation control of multi-crystal solar cell
2.Analyses of formation of graphite and carbides

○Microstructure control and evaluation of characteristics for iron based alloy for casting
1.Microstructure control of high alloyed cast iron by a CALPHAD method

○Microstructure control and evaluation of characteristics for alloy particle for thermal spray processing
1.Influence of cooling rate on microstructure of iron, nickel, cobalt and aluminum alloy

○Microstructure control and evaluation of characteristics of non-ferrous iron for casting
1.Influence of alloy element on microstructures of magnesium and aluminum alloys

○Microstructure control and evaluation of characteristics of composite materials
1.Analysis of crystal morphology and phase selection among fibers

--Education--
○For graduate student
1.Control of crystal growth
2.Composite materials

○For Undergraduate student
1.Solidification and crystalline growth
2.Joining and composite engineering
Research
Research Interests
  • Creation of structural or functional materials by 3D printer
    keyword : metal powder, laser, rapid solidification, amorphous
    2016.04.
  • Control of rapid melt – solidified microstructure using a selective laser melting
    keyword : rapid solidification, dendrite arm , amorphous
    2016.04.
  • 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.
  • Analysis of fluid flow mechanism and critical condition of formation of cast defects of ferro- and non-ferro- alloys
    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
    2002.04Microstructure 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..
  • Microstructural Control of Ceramic Reinforced Metals by the Solidification Processing
    keyword : composites, dislocation, ceramics, diffusivity,
    1994.04Directional solidification studies is carried out in continuous alumina fiber reinforced Al-Cu alloy composites in order to clarify the influences of fibers on crystal growth of matrix alloy in the composites. A model based on the continuity of liquid phase among fibers reveals how fibers influence both the concentration of copper on the dendrite tips and the size of the lateral solute diffusion field..
  • computer simulation for crystal growth of metal matrix composites
    keyword : composites, thermal diffusion, cast, simulation, wear resistant, micro segregation
    1997.04~2009.03Numerical simulation is applied to evaluate the thermal and solutal influences of fibers on the dendrite growth of matrix alloy reinforced with continuous fibers. The results of temperature and solute distribution, and dendrite tip undercooling and tip radius were compared with experimental data obtained from directional solidification studies for fiber reinforced succinonitrile-acetone alloy composites. Numerical analysis reveals that tip composition and undercooling increased as the fiber interstices became smaller than the primary dendrite arm spacing. The constraint of growth on the secondary arm and the change of dendrite morphology are also shown in the analysis..
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
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
1. B. Proaño, H. Miyahara, K. Morishita, T. Matsumoto, H. Sakai, H. Noguchi, S. Hamada, Annealing effects on fracture process and tensile strength of non-combustible Mg products fabricated by selective laser melting, Theoretical and Applied Fracture Mechanics, 120, 103411_1-13, 2022.12.
2. H. Miyahara, G. Ito, I. Narita, Observation of Heterogeneous Nucleation of Graphite for Spheroidal Graphite Cast Iron, Proceedings of International Symposium on the Science and Processing of Cast Iron (SPCI-XII), 2021.11.
3. Kazunori Kamimiyada, Shinya Ishikawa, Hirofumi Miyahara and Yuji Konno, Effect of MC Type Carbides on Wear Resistance of High Wear Resistant Cast Iron Rolls Developed for Work Rolls of Hot Strip Mills, ISIJ International, https://doi.org/10.2355/isijinternational.ISIJINT-2021-127, Vol.61, No.10, 2597-2604, 61(10)(2021)2597-2604., 2021.10.
4. B. Proaño, H. Miyahara, T. Matsumoto, S. Hamada, H. Sakai, K. Ogawa, Suyalatu, H. Noguchi, Plastic strain distribution throughout the microstructure duality during the fracture process of non-combustible Mg products fabricated by selective laser melting, Theoretical and Applied Fracture Mechanics, 110, 102805, 2020.12.
5. B. Proaño, H. Miyahara, T. Matsumoto, S. Hamada, H. Sakai, K. Ogawa, Suyalatu, H. Noguchi, Weakest Region Analysis of Non-combustible Mg Products Fabricated by Selective Laser Melting, Theoretical and Applied Fracture Mechanics, 103, 102291, 2019.10.
6. Y. Koga, K. Sakata, D. Oka, K. Kuwatori, I. Narita, H. Miyahara, Formation of Fe-Cr-Mo Alloy Metallic Glass Coating Using Hig-Velocity Oxy-Fuel Apparatus with Hydrogen Gas and Its Microstructural Transition at Elevated Temperatures, Materials Transactions, Vol.58, No.10, 1444-1450, 58(10)(2017),1444-1450., 2017.10, [水素ガスと高速フレーム溶射によるFe-Cr-Mo合金金属ガラス皮膜の形成と高温保持におけるその組織変化]
本研究ではHVOF溶射を改善しCO2量を削減することを目的として,水素ガスを用い,再溶融処理を省略したHVOFによる金属ガラス溶射皮膜を調査した.さらに金属ガラスの高温での結晶化現象について評価した..
7. Surface microstructure and property of nodular cast iron solidified rapidly by laser surface melting process
R. Murakami, I. Narita, H. Miyahara..
8. Ryutaro Hara, Masahiro Yamamoto, Gen Ito, Kazunori Kamimiyada, Ichihito Narita, Hirofumi Miyahara, Effect of Nitrogen on the Microstructure and Hardness of High- Carbon High-Speed Tool Steel Type Alloys, Materials Transactions, Vol.57, No.11, 1945-1951, Vol.57 No.11 (2016) pp.1945-1951., 2016.11.
9. K. Uchida, G. Ito, I. Narita, H. Miyahara, Heterogeneous Nucleation of Spheroidal Graphite on Ductile Cast Iron, Proceedings of The 6th Korea-Japan Conference for Young Foundry Engineers, 58-60, pp. 58-60, 2016.08.
10. N. Teshima, Y. Fuchigami, I. Narita, H. Miyahara, Effect of vibration on unidirectional solidification microstructure for polycrystalline silicon, Proceedings of The 6th Korea-Japan Conference for Young Foundry Engineers, 82-84, pp. 82-84, 2016.08.
11. K. Yoshimoto, R. Hara, M. Yamamoto, G. Ito, K. Kamimiyada, I. Narita, H. Miyahara, Effect of Boron and Nitrogen Addition on the Solidification Microstructure of High-Carbon HSS Type Mill Roll, Proceedings of The 6th Korea-Japan Conference for Young Foundry Engineers, 121-123, pp. 121-123, 2016.08.
12. Y. Koga, K. Sakata, D. Oka, K. Kuwatori, I. Narita, H. Miyahara, Solidification and precipitation sequences of sprayed Fe-Cr-Mo-C-B alloy metallic glass coating, Proceedings of The 6th Korea-Japan Conference for Young Foundry Engineers, 75-77, pp. 75-77, 2016.08.
13. T. Yamaguchi, N. Teshima, H. Miyahara, Fundamental Analysis of Metal Film Formation by Atomizer
, Proceedings of The 6th Korea-Japan Conference for Young Foundry Engineers, 72-74, pp. 72-74, 2016.08.
14. Thermal Spray Technology of Metallic Glass Utilizing Hydrogen
K. Sakata, Y. Koga, H. Miyahara..
15. Formation of Fe-Cr-Mo Alloy Metallic Glass Coating by Hydrogen Gas and Microstructural Transition at Elevated Temperature
Y. Koga, K. Sakata, D. Oka, K. Kuwatori, I. Narita, H. Miyahara..
16. Effect of Nitrogen on the Microstructure and Hardness of High-Carbon High-Speed Steel Type Alloy.
17. Naoya OCHI, Yu-ki HIGUCHI, Ichihito NARITA, Hirofumi MIYAHARA, Toshiharu MATSUMOTO, Hiroshi Noguchi, Fracture-Mode-Identification Method from Shrinkage Porosity of Mg Cast Alloy Based on Microscopic Plastic Deformation Measurement, Materials Science and Engineering A, 642, 113-116, pp. 113-116, 2015.01.
18. Formation of Cast Structure and Transformation Process of Ferritization in Low Carbon Spheroidal Graphite Cast Iron
Kohsuke Ashizuka, Hiroyoshi Takada, Hirofumi Miyahara, Ichihito Narita, Ryuta Suzuki, Keisaku Ogi.
19. K. Sakata, K. Tagomori, N. Sugiyama, S. Sasaki, Y. Shinya, T. Nanbu, Y. Kawashita, I. Narita, K. Kuwatori, T. Ikeda, R. Hara, H. Miyahara, Dust Explosion Characteristics of Aluminum, Titanium, Zinc, and Iron-Based Alloy Powders Used in Cold Spray Processing, Journal of Thermal Spray Technology, Vol.23, No.1-2, 123-130, 2014.01.
20. Effect of C and Si on Mechanical Properties of Ferritized Spheroidal Graphite Cast Iron
Kohsuke Ashizuka, Naoyuki Suura, Tomohiro Ikeda, Takuo Umetani, Takashi Nemoto, Hiroyoshi Takada, Hirofumi Miyahara and Keisaku Ogi.
21. Reita Murakami, Takashi Uchino, ICHIHITO NARITA, Hirofumi Miyahara, Control of initial solidification structure of polycrystalline silicon ingot by α-Si₃N₄ and β-Si₃N₄ mold lubricants, Proceedings of The 5th Korea-Japan Conference for Young Foundry Engineers, 128, pp., 2013.09.
22. Masafumi Hamasaki, Hirofumi Miyahara, Solidification Microstructures and Critical Conditions of Shrinkage Porosity Generation in Die Casting Process of JIS-ADC12 (A383) alloy, Materials Transactions, Vol.54, No.7, 1131-1139, 2013.07, Differential thermal analysis (DTA), analyses of unidirectional solidification process and die casting process, and computational numerical simulation were conducted for JIS- ADC12 (A383) alloy to investigate the generation conditions of the shrinkage porosities which occasionally appear in JIS-ADC12 die castings and affect the quality of products. The crystallization temperature of the primary alpha phase and Al-Si binary eutectic phase are estimated to to be 856K and 838K from DTA, respectively. The multi-phase eutectic reaction of JIS-ADC12 alloy starts from 826K, and finishes at 801K. The primary alpha dendrites are clearly observed in unidirectional solidification microstructures, and the relationship between the secondary dendrite arm spacing and local solidification time can be expressed by the following equation. The primary alpha dendrites are also observed in the cast sample. The average cooling rate estimated from is approximately 60K/s at the depth of 0.5mm from the surface of die castings. The computational numerical simulation revealed that the values of solidification parameter increased around the surface of the JIS-ADC12 die casting in where the amount of shrinkage porosities decreases. Especially, shrinkage porosities of the size larger than 200μm is observed when the value of is less than or equal to 1.4 K0.5s0.5/mm..
23. Fractal Analysis of Solidification Microstructure of High Carbon High Alloy Cast Roll Manufactured by Centrifugal Casting
Masahiro YAMAMOTO, Ichihito NARITA and Hirofumi MIYAHARA.
24. Analysis of Distribution of Casting Defect and Feeding Effect in ADC12 Alloy Die Casting Part
Masafumi HAMASAKI, Hirofumi MIYAHARA.
25. Solidification Microstructure and Criteria Conditions of Shrinkage Porosity in Die Casting Process of ADC12 alloy
Masafumi HAMASAKI, Hirofumi MIYAHARA.
26. 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, 43, pp. 43, 2011.11.
27. 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, 118, pp. 118, 2011.11.
28. 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.
29. 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.
30. Introduction of solidification processing 2
Hirofumi MIYAHARA.
31. Introduction of solidification processing 1
Hirofumi MIYAHARA.
32. 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, 93-94, 2010.02.
33. 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, 29, 2010.02.
34. 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, 1075-1079, vol.49(7), pp.1075-1079, 2009.07.
35. Alloy Design and Carbides Control for Rolls of Continuous Casting
Materials Science and Technology, Vol.79(1), pp.8-14, January 2009.
36. 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, 648-688, (2008), 684-688, 2008.10.
37. 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.
38. 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.
39. Effect of Surface Texture and Nitriding on Galling Properties in Materials Used for Press-roming Tools.
40. 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.
41. 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.
42. T.Ngasawa, T.Ota, H.Miyahara and K.Ogi, Solidification Microstructure and Dry Sliding Wear Behavior for SiC Particle and Alumina Short Fiber Reinforced alloy Composites, Proceedings of 10th Asian Foundry Congress, pp.267-272, 2008.05.
43. 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.
44. 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.
45. 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.
46. Simulation of Gas Gap Formation between Substrate Surface and Molten Steel During Initial Solidification
Masafumi MIYAZAKI and Hirofumi MIYAHARA.
47. 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.
48. 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.
49. 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.
50. 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.
51. 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.
52. 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.
53. 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.
54. 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.
55. 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.
56. 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.
57. 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..
58. 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.
59. 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.
60. 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.
61. Hua-Nan LIU, Hirofumi MIYAHARA, Keisaku OGI, Solidification of Al-Cu Alloys in the presence of Closely Spaced Al2O3 Continuous Fibers, Proc. of 5th Asian Foundry Congress, Vol. No. pp.425-432, 1997.09.
62. H.G. Kang, H. Miyahara, K. Ogi, Effects of Sr Content and Cooling Rate on Microstructures and Tensile Propaties of Al-Si-Cu Alloys, Proc. of 4th Asian Foundry Congress incorporated in 32th Annual Convention of Austrian Foundry Institute, (1995),429-437, 1996.10.
63. Vol.60 9(1996)pp.863-869..
64. H.G.Kang, H. Miyahara, K. Ogi, Influence of Cooling Rate and Addition of Sr and Ti-B on Solidification Structure of AC4B Type Alloys, Proc. of the Third Asian Foundry Congress, 108-115, (1995),108-115., 1995.11.
65. H. Miyahara, N. Mori, K. Ogi, Solidification Structures in Alumina Fiber / Aluminum Alloy Composites, Cast Composites '95, 5-8, (1995),5-8., 1995.10.
66. Vol.81 9(1995)pp.912-917..
67. Vol.59 6(1995)pp.660-665..
68. Hirofumi Miyahara, R. Muraoka, Kozo Wakasugi, Keisaku Ogi, Application of Secondary Ion Mass Spectrometry to Analysis of Interfacial Reaction between Molten Aluminum Alloy and Alumina, Secondary Ion Mass Spectrometry (SIMS IX), Vol.9 No. pp.895-898, 1994.12.
69. Keisaku Ogi, Hirofumi Miyahara, Nobuyuki Mori, Wettability and Interfacial Reactin between Molten Al Alloy and Al2O3-SiO2 Ceramics, Proc. of U.S.-Japan Cooperative Science Program Seminar on Solidification Processing for the 21st Century, Vol. No. pp.107-114, 1994.01.
70. Keisaku Ogi, H.Zhou, Hirofumi Miyahara, Noriko Murai, Solidification of High Speed Steel Type Cast Iron, Porc. of Fifth Int. Sympo. on the Physical Metallurgy of Cast Iron, Vol. No. pp.-, 1994.01.
71. Hirofumi Miyahara, Nobuyuki Mori, Keisaku Ogi, Wettability and Reaction between Molten Alumium and Alumina, Proc. of the Fourth East Asian Int. Foundy Sympo., Vol. No. pp.-, 1993.12.
72. Wettability between Molten Aluminum and Electroless Copper Plated Al2O3
Hirofumi Miyahara Nobuyuki Mori and Keisaku Ogi
J. Japan Inst. Metals
Vol.57 7(1993)pp.797-803..
73. Nobuyuki Mori, Hirofumi Miyahara, Keisaku Ogi, Modeling of Infiltration Process of Alumina Fiber Preform by Molten Metal, Proc. of the Sixth Conf. in a Series on Modeling Casting and Welding Processes, Vol. No. pp.-, 1993.03.
74. Wettability and Reaction between Molten Aluminum and Al2O3-SiO2 Substrate
Hirofumi Miyahara Jun Otani Nobuyuki Mori and Keisaku Ogi
J. Japan Inst. Metals
Vol.56 9(1992)pp.1056-1063..
75. Infiltration Process of Al2O3 Fiber Preform by Molten Metal
Nobuyuki Mori Hirofumi Miyahara and Keisaku Ogi
Imono
Vol.64 4(1992)pp.252-259..
76. N. Mori, H. Miyahara, K. Ogi, Infiltration Process of Molten Metal into Al2O3 Fiber Preform, Proc. of First Pacific Rim Int. Conf. on Modeling of Casting and Solidification Processes 1991, (1992), 1992.03.
77. N. Mori, H. Miyahara, K. Ogi, Liquid State Processing of Aluminum Al2O3 Fiber Composite, Proc. of the Second East Asian International Foundry Symposium, (1991)., 1991.07.
78. Wettability and Interaction between Molten Al and Ni-coated Al2O3 or Pure Ni Substrate
Nobuyuki Mori Hirofumi Miyahara Masaaki Koga and Keisaku Ogi
J. Japan Inst. Metals
Vol.55 4(1991)pp.444-451..
Presentations
1. Sachana Suphattra, 森下 浩平, 宮原 広郁, Influence of Heat Treatment on Surface Morphology of Melted Mark on Copper Wire, 日本金属学会 春期講演大会(第170回), 2021.03.
2. H. Miyahara, G. Ito, I. Narita, Observation of Heterogeneous Nucleation of Graphite for Spheroidal Graphite Cast Iron, International Symposium on the Science and Processing of Cast Iron (SPCI-XII), 2021.11.
3. Juhuai Ma, Koki Minami, Kohei Morishita, Hirofumi Miyahara, Minori Miou, Hisao Esaka, Influence of bridging on macrosegregation for medium carbon cast steel, 日本金属学会日本鉄鋼協会 九州支部合同学術講演会(2021年), 2021.06.
4. Suphattra Sachana, Kohei Morishita, Hirofumi Miyahara, Effect of Holding Times on Microstructure of Melted Mark on Copper Wire, 日本金属学会日本鉄鋼協会 九州支部合同学術講演会(2021年), 2021.06.
5. Analysis of segregation and cast defect developed at center of mold.
6. Analysis of segregation and cast defect developed at center of mold.
7. Analysis of segregation and cast defect developed at center of mold.
8. Analysis of segregation and cast defect developed at center of mold.
9. K. Yoshimoto, R. Hara, M. Yamamoto, G. Ito, K. Kamimiyada, Ichihito Narita, Hirofumi Miyahara, Effect of Boron and Nitrogen Addition on the Solidification Microstructure of High-Carbon HSS Type Mill Roll, The 6th Korea-Japan Conference for Young Foundry Engineers, 2016.08.
10. K. Uchida, G. Ito, Ichihito Narita, Hirofumi Miyahara, Heterogeneous Nucleation of Spheroidal Graphite on Ductile Cast Iron, The 6th Korea-Japan Conference for Young Foundry Engineers, 2016.08.
11. N. Teshima, Y. Fuchigami, Ichihito Narita, Hirofumi Miyahara, Effect of vibration on unidirectional solidification microstructure for polycrystalline silicon, The 6th Korea-Japan Conference for Young Foundry Engineers, 2016.08.
12. Y. Koga, K. Sakata, D. Oka, K. Kuwatori, Ichihito Narita, Hirofumi Miyahara, Solidification and precipitation sequences of sprayed Fe-Cr-Mo-C-B alloy metallic glass coating, The 6th Korea-Japan Conference for Young Foundry Engineers, 2016.08.
13. T. Yamaguchi, N. Teshima, Hirofumi Miyahara, Fundamental Analysis of Metal Film Formation by Atomizer, The 6th Korea-Japan Conference for Young Foundry Engineers, 2016.08.
14. Reita Murakami, Takashi Uchino, Ichihito Narita, Hirofumi Miyahara, Control of initial solidification structure of polycrystalline silicon ingot by α-Si₃N₄ and β-Si₃N₄ mold lubricants, The 5th Korea-Japan Conference for Young Foundry Engineers, 2013.09.
15. Hua-Nan LIU, Hirofumi MIYAHARA, Keisaku OGI, Solidification of Al-Cu Alloys in the presence of Closely Spaced Al2O3 Continuous Fibers, The 5th Asian Foundry Congress, 1997.09.
16. Hyogyoung Kang, Masahiro KIDA, Hirofumi MIYAHARA, Keisaku OGI, Influence of Cu and Mg on the Age Hardening Characteristic of Al-Si-Cu Base Cast Alloys, The 5th Asian Foundry Congress, 1997.09.
17. T. Kang, Hirofumi Miyahara, Keisaku OGI, Effects of Sr Content and Cooling Rate on Microstructures and Tensile Proprieties of Al-Si-Cu Alloys, 4th Asian Foundry Congress incorporated in 32th Annual Convention of Austrian Foundry Institute, 1996.10.
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
Educational Activities

(1) Control of crystal growth---Lecture concerning distribution of alloying element on crystal growth for alloys
(2) Composite materials---Lecture concerning design, processing and control of composite materials


(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.