Kyushu University · Engineering
Professor Toshihiro Tsuchiyama's research lab specializes in advanced materials processing and microstructure control, particularly focusing on high-chromium martensitic steels and high-nitrogen stainless steels. The lab investigates fundamental phenomena such as recrystallization, tempering behavior, and grain refinement through techniques like mechanical alloying, powder consolidation, and heat treatment. Key research directions include the development of fine-grained, high-strength steels with enhanced creep resistance and corrosion stability by manipulating precipitation behavior and grain boundary dynamics. The lab also explores the role of nanoscale carbides and nitrides in controlling microstructural evolution and mechanical properties.
Figures are computed from collected data and may differ slightly.
The recrystallization behavior of lath martensite during tempering was investigated in high-chromium martensitic steels by means of hardness testing, optical and transmission electron microscopy. The role of carbide particles on the recrystallization was also discussed in terms of the grain boundary pinning effect. The hardness of tempered specimens was plotted as a function of the tempering parameter, T(logt+20), for a low-carbon steel (Fe–9Cr–0.1C mass%) and an ultra-low carbon steel (Fe–9Cr–1
Mechanical alloying (MA) treatment was applied for the fabrication of fine-grained high nitrogen stainless steels. Chromium nitride (Cr2N) powder was mixed with Fe-Cr binary alloy powder to control its mean chemical composition to be Fe-23mass%Cr-1mass%N which is enough to stabilize austenitic structure at room temperature. The powder mixture was mechanically alloyed up to 360 ks in an argon gas atmosphere (MA powder). The MA powder was packed in a stainless steel tube in a vacuum and consolidat
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