九州大学 · 工学
Tsuchiyama教授の研究室では、高張力・高耐腐食性を併せ持つ高クロムマルテンサイト鋼や高窒素ステンレス鋼の微細組織制御とその力学的・耐久特性の向上を目的としています。特に、焼鈍処理における再結晶挙動や機械的合金化によるナノ構造形成のメカニズムを、硬度測定や電子顕微鏡を用いて解明しています。また、炭化物析出が結晶粒界に与えるピンギング効果や、窒化物の形成が相安定性に与える影響にも注目しています。
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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