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Kudo Kentaro Last modified date：2023.06.30

Assistant Professor / Manufacturing process lectureship
Department of Mechanical Engineering
Faculty of Engineering


Graduate School
Department of Mechanical Engineering
Graduate School of Engineering
Undergraduate School
Department of Mechanical and Aerospace Engineering
School of Engineering


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/kentaro-kudo
　Reseacher Profiling Tool　Kyushu University Pure
Academic Degree
Doctor of engineering (Kyushu University)
Country of degree conferring institution (Overseas)
No
Field of Specialization
Powder metallurgy
Total Priod of education and research career in the foreign country
00years00months
Outline Activities
Research on material processing mainly in powder metallurgy process.
In particular, research has been conducted on the characteristics of metal materials produced by metal injection molding (MIM).
Research
Research Interests
  • Research on Ni based super-alloy by metal injection molding
    keyword : Metal injection molding, Ni　based super-alloy
    2017.04～2019.06.
  • Improvement of fatigue strength of Ti alloy manufactured by metal injection molding
    keyword : Metal injection molding, fatigue, Titanium alloy
    2015.04～2019.06.
Academic Activities
Papers
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1. K. KUDO, K. SHINAGAWA , H. MIURA, The Effects of Grain Size and Pore Size on the High Cycle Fatigue Behavior of Injection Molded Ti-6Al-4V Compacts, Advances in Powder Metallurgy & Particle Materials-2018，Proceedings of the 2018 International Conference on Powder Metallurgy & Particulate Materials, POWDERMET2018, 243-252, 2018.06.
2. Kentaro KUDO, Kazunari SHINAGAWA, Hideshi MIURA,, Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts, Mechanical Engineering Journal, 5, 4, No.17-00686, 2018.04.
3. Kentaro Kudo, Kazunari Shinagawa, Hideshi Miura, Evaluation of influence factors on the microstructure, static and dynamic mechanical properties of injection molded Ti-6Al-4V based compacts by multiple addition of Mo and B Elements, Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.65.145, 65, 3, 145-153, 2018.01, Although the injection molded Ti alloys show sufficient tensile strength, their fatigue strength was significantly lower than that of wrought material. In this study, the effect of both additions of molybdenum and boron in the Ti-6Al-4V compacts on the microstructural refinement and strength was evaluated. The 4Mo-0.4B added compacts showed fine microstructure and resulted in high tensile strength. However, their fatigue strength was not improved. The degree of influence of oxygen content, relative density and grain size on the tensile strength was estimated, and the main factor of improving tensile strength was the grain refinement. Also, the cause that fatigue strength was not improved was the ratio of the maximum pore diameter to the grain diameter increased due to the microstructural refinement, so that the crack initiated from large pore..
4. K. KUDO, H. ISHIMITSU, J. CHOE, T. OSADA, H. MIURA, K. SHINAGAWA, Effect of Grain Size on the Fatigue Properties of Injection Molded Ti-6Al-4V Compacts, Proceedings of the 2016 Powder Metallurgy World Congress & Exhibition, 3291789, 1-6, 2016.10.
5. Kentaro Kudo, Sek Kin Wai, Toshiko Osada, Fujio Tsumori, Hideshi Miura, Improvement of mechanical properties of injection molded ni-base superalloy compacts, Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.462, 63, 7, 462-467, 2016.01, Superalloy has been used for aerospace application because of their excellent attributes of high strength and corrosion resistance at high temperature. Inconel 718 is one of the representative Ni-based superalloy. Generally, superalloy has poor workability, especially high tool wear by machining, so that it is not easy to produce the components of complex shaped parts at low cost. To overcome such as the problem, metal injection molding (MIM) process would be a useful technique which offers net shape production, high design flexibility, and high cost efficiency for mass production. In this study, gas-atomized fine alloy powder of Inconel 718 was prepared for MIM process, and the mechanical properties of injection molded compacts were investigated. The relative density over 99.7 %, which is much higher than density of usual MIM compacts, was obtained by supersolidious liquid-phase sintering. Furthermore, injection molded Inconel 718 showed high fatigue strength comparable to the wrought materials, because the pore size of the MIM compacts was smaller than the inclusion size of wrought materials. And it was found that the grain size was more dominant than pore size against the fatigue failure of MIM Inconel 718 with near full density..
Presentations
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Membership in Academic Society
  • The Iron and Steel Institute of Japan
  • The Japan Society for Technology of Plasticity
  • Japan Society of Powder and Powder Metallurgy
  • The Japan Society of Mechanical Engineers
Educational
Other Educational Activities
  • 2021.07.
  • 2020.07.
  • 2019.08.


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