著者
Toshihiro Tsuchiyama Takayuki Sakamoto Shohei Tanaka Takuro Masumura
出版者
The Iron and Steel Institute of Japan
雑誌
ISIJ International (ISSN:09151559)
巻号頁・発行日
vol.60, no.12, pp.2954-2962, 2020-12-15 (Released:2020-12-16)
参考文献数
13

Medium manganese steel (Fe-5.0%Mn-1.2%Si-0.10%C alloy) was subjected to interrupted quenching from the austenite single-phase region to a temperature between Ms and Mf followed by intercritical annealing in the ferrite and austenite dual-phase region at 923 K. As a result, a core-shell type second phase, which consisted of a fresh martensite core surrounded by a film-like retained austenite shell, was formed. The mechanism and kinetics of reversion for the interrupted-quenched specimens were analyzed with DICTRA simulation and TEM observation. With regard to the effect of the core-shell type second phase on mechanical properties, it was inferred that the fresh martensite core functioned as a hard second phase and enhanced work hardening by stress partitioning similar to DP steel, while the film-like retained austenite contributed to improved ductility due to the TRIP effect. As the interrupted quenching temperature decreased, the volume fraction of the fresh martensite core decreased, while the stability of the retained austenite shell increased. This showed potential for controlling the strength and ductility balance of medium manganese steel. A possible beneficial effect of the core-shell type second phase on the ductile fracture behavior was also discussed in terms of stress/strain relaxation at the interfaces between hard martensite and ferrite matrix.

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日本鉄鋼協会欧文誌論文賞<澤村論文賞> Control of Core-shell Type Second Phase Formed via Interrupted Quenching and Intercritical Annealing in a Medium Manganese Steel ISIJ International, Vol.60, No. 12, pp. 2954–2962 土山聡宏, 坂本孝之, 田中祥平, 増村拓朗 https://t.co/hLLVH5UU8q

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