Heat resistant steelsAlloysPhase equilibriaMicrostructure control
I obtained PhD in Engineering at Tokyo Institute of Technology (Tokyo Tech) in March 2002. I was then in Max-Planck-Institut für Eisenforschung GmbH as a postdoc for 4 years and in Institute for Materials Research, Tohoku University as an assistant professor for 4 years and a half and in National Institute for Materials Science as a senior researcher for 4 years and a half and came back to Tokyo Tech in January 2015 and then assumed the present post since August 2017. Research interest so far includes phase diagrams and microstructure control studies for intermetallic alloys such as TiAl alloys and microstructure and creep property relationship for ferritic and Ni based heat resistant alloys.
Expectations for WRHI
I hope to interact with scientists in the research field and to make collaborative researches including an exchange of graduated students.
Ferritic heat resistant steels with lowered thermal expansion and improved creep resistance
This project aims at developing ferritic heat resistant steels with lowered thermal expansion and improved long term creep resistance to meet highly fluctuating load/temperature conditions in combined-cycle power plants. We have been investigating the roles of magnetism of iron and interaction between iron and alloying elements on thermal expansion of the ferrite and a new creep strengthening way using precipitation of Laves phase instead of conventional carbo-nitride phases.
Magnetisminteraction parametersdiffusion coefficientstrengthened by Intermetallic phases
Microstructural control of Ni based wrought alloys with improved creep resistance for turbine disk applications
This project aims at improving creep strength of Ni base wrought alloys for jet engine disc applications at increased temperatures in terms of grain size dependence of creep strength, precipitation strengthening by intermetallic phases other than gamma prime-Ni3Al phase and microstructure stability at high temperatures.
Grain size dependence on creep strengthprecipitation strengtheningdiscontinuous precipitationintermetallic phasesparticle coarsening
Development of Laves phase strengthened ferritic heat resistant steels and novel Ni base superalloys strengthened by platelet precipitates using bulk combinatorial method etc.
|2002 - 2006||
Max Planck Institute fuer Eisenforschung GmbH Researcher
|2006 - 2011||
Tohoku Univ. Assistant Professor
|2011 - 2014||
National Institute for Material Science Principal researcher
|2015 - 2016||
Tokyo Tech Dept. of Metallurgy and Ceramics Science Associate Professor
Tokyo Tech School of Materials and Chemical Technology Associate Professor
Nishiyama Memorial Award (ISIJ)
Physical Metallurgy for Wrought Gamma Titanium Aluminides -Microstructure Control through Phase Transformations-: Takeyama M, Kobayashi S, Intermetallics, vol. 13, pp. 993-999, 2005.
Determination of Phase Equilibria in the Co-rich Co–Al–W Ternary System with a Diffusion-Couple Technique: Kobayashi S, Tsukamoto Y, Takasugi T, Chinen H, Omori T, Ishida K, Zaefferer S, Intermetallics, vol. 17, pp. 1085-1089, 2009.
Mapping of 475 °C embrittlement in ferritic Fe-Cr-Al alloys: Kobayashi S, Takasugi T, Scripta Materialia, vol. 63, pp. 1104-1107, 2010.
Interphase precipitation of Fe2Hf Laves phase in a Fe-9Cr/Fe-9Cr-Hf diffusion couple: Kobayashi S, Kimura K, Tsuzaki K, Intermetallics, vol. 46, pp. 80-84, 2014.