中Mn鋼の中断焼入-二相域焼鈍により形成されるコア-シェル型第二相組織の制御

DOI DOI Web Site Web Site 被引用文献2件 参考文献10件 オープンアクセス
  • 土山 聡宏
    九州大学大学院 工学研究院 材料工学部門 九州大学カーボンニュートラル・エネルギー国際研究所 (WPI-I2CNER)
  • 坂本 孝之
    九州大学大学院工学府
  • 田中 祥平
    九州大学大学院工学府
  • 増村 拓朗
    九州大学大学院 工学研究院 材料工学部門 九州大学カーボンニュートラル・エネルギー国際研究所 (WPI-I2CNER)

書誌事項

タイトル別名
  • Control of Core-shell Type Second Phase Formed via Interrupted Quenching and Intercritical Annealing in a Medium Manganese Steel

説明

<p>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.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 108 (5), 306-315, 2022

    一般社団法人 日本鉄鋼協会

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