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首页> 外文期刊>Journal of Materials Research >Modulated martensite formation behavior in Fe-Ni-based alloys; athermal and thermally activated mechanisms
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Modulated martensite formation behavior in Fe-Ni-based alloys; athermal and thermally activated mechanisms

机译：Fe-Ni基合金中马氏体的调制行为；非热激活机制

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摘要

The martensitic transformation of Fe-22 wt% Ni austenite was investigated by high-resolution dilatometry as well as differential thermal analysis. Macroscopically discontinuous formation of lath martensite was observed, manifested in a train of transformation-rate maxima. It is proposed that the modulation of the transformation rate is caused by simultaneous formation of blocks in different martensite packages. The origin of simultaneity is ascribed to the interplay of chemical driving force, developing strain energy, and its relaxation upon sufficiently slow cooling. The transformation-rate maxima become more distinct with decreasing cooling rate (CR), clearly indicating the involvement of a thermally activated process in martensite formation. Quantitative analysis of the microstructure of differently cooled specimens revealed smaller martensite block sizes for higher CRs. All observations are compatible with athermal nucleation and thermally activated growth. (Local) strain relaxation in the austenite was identified as the involved thermally activated mechanism.
机译：Fe-22 wt％Ni奥氏体的马氏体转变通过高分辨率膨胀法和差热分析进行了研究。观察到板条马氏体的宏观不连续形成，表现为一系列的转化率最大值。提出转变速率的调制是由在不同马氏体包中同时形成块引起的。同时性的起源归因于化学驱动力，产生的应变能及其在充分缓慢冷却时的松弛之间的相互作用。随着冷却速率（CR）的降低，转变速率的最大值变得更加明显，这清楚地表明了热活化过程参与了马氏体的形成。对不同冷却样品的微观结构的定量分析显示，马氏体块尺寸较小，CR较高。所有观察结果都与无热成核和热活化生长相符。奥氏体中的（局部）应变松弛被确定为涉及的热激活机制。

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  • 来源
    《Journal of Materials Research》 |2015年第13期|2101-2107|共7页
  • 作者

    Sarah Loewy; Bastian Rheingans; Sai Ramudu Meka; Eric J. Mittemeijer;

  • 作者单位

    Max Planck Institute for Intelligent Systems (Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany;

    Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany;

    Max Planck Institute for Intelligent Systems (Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany;

    Max Planck Institute for Intelligent Systems (Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany;

  • 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);
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