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首页> 外文期刊>ISIJ international >Control of Core-shell Type Second Phase Formed via Interrupted Quenching and Intercritical Annealing in a Medium Manganese Steel
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Control of Core-shell Type Second Phase Formed via Interrupted Quenching and Intercritical Annealing in a Medium Manganese Steel

机译：通过中断淬火和中锰钢中断淬火和跨临界退火形成的核壳型第二相的控制

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摘要

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 M_s and M_f 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.
机译：中锰钢（Fe-5.0％Mn-1.2％Si-0.10％C合金）对奥氏体单相区域进行中断猝灭，在M_S和M_F之间的温度下，然后在铁素体和奥氏体双相中进行跨临界退火结果，在923k处。结果，形成由由膜状残留的奥氏体壳包围的新鲜马氏体核心组成的核壳型第二阶段。用DiCTRA仿真和TEM观察分析了中断淬火标本的逆转的机制和动力学。关于核壳型第二相对机械性能的影响，推断出作为硬度第二相的新鲜马氏体核心，并通过与DP钢的应力分配增强的工作硬化，而膜状保留的奥氏体由于跳闸效应而导致的延展性提高。随着中断淬火温度降低，新鲜马氏体核的体积分数降低，而保留奥氏体壳的稳定性增加。这表明控制中锰钢强度和延展性平衡的可能性。在硬马氏体和铁氧体基质之间的界面处的应力/应变弛豫方面还讨论了核壳型第二阶段对延展性裂缝行为的可能有益效果。

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  • 来源
    《ISIJ international》 |2020年第12期|2954-2962|共9页
  • 作者

    Toshihiro TSUCHIYAMA; Takayuki SAKAMOTO; Shohei TANAKA; Takuro MASUMURA;

  • 作者单位

    Department of Materials Science and Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Graduate School of Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Department of Materials Science and Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Department of Materials Science and Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    medium manganese steel; core-shell structure; TRIP effect; microstructure control; mechanical property;

    机译：中型锰钢;核心壳结构;跳闸效果;微观结构控制;机械性质;

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