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首页> 外文期刊>ISIJ international >Mechanical Behavior of Individual Retained Austenite Grains in High Carbon Quenched-tempered Steel
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Mechanical Behavior of Individual Retained Austenite Grains in High Carbon Quenched-tempered Steel

机译：高碳淬火钢中单个残余奥氏体晶粒的力学行为

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摘要

The deformation behaviors of metastable retained austenite and martensite in a high carbon quenched-tempered steel were investigated complementarily using electron backscattered diffraction, nanoindentation and transmission electron microscopy (TEM) to determine the effect of the austenite grain size on its mechanical stability. Investigation by the nanoindentation have shown that martensite exhibits a single plastic deformation stage, i.e., a dislocation glide motion, whereas metastable retained austenite exhibits double plastic deformation stages. TEM observations of a cross-sliced foil with an indentation mark has suggested that the first stage deformation in the austenite phase is dominated by stress-induced martensite transformation, while the second stage is governed by the slip deformation of dislocations in the transformed martensite. Furthermore, we have found that the stress required for the phase transformation and for the transition from the phase transformation to the plastic deformation of transformed martensite increase with decreasing in austenite grain size, indicating that fine austenite grains are mechanically more stable than coarse austenite grains.
机译：利用电子背散射衍射，纳米压痕和透射电子显微镜（TEM）对高碳淬火回火钢中亚稳态残余奥氏体和马氏体的变形行为进行了补充研究，以确定奥氏体晶粒尺寸对其机械稳定性的影响。通过纳米压痕的研究表明，马氏体表现出单一的塑性变形阶段，即位错滑移运动，而亚稳态的残余奥氏体表现出双重的塑性变形阶段。透射电镜对带有凹痕的交叉切割箔片的观察表明，奥氏体相的第一阶段变形主要由应力引起的马氏体相变主导，而第二阶段则由相变马氏体中位错的滑移变形控制。此外，我们发现，随着奥氏体晶粒尺寸的减小，相变以及从相变到相变马氏体的塑性变形的转变所需的应力会随着奥氏体晶粒尺寸的减小而增加，这表明细奥氏体晶粒比粗奥氏体晶粒在机械上更稳定。

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  • 来源
    《ISIJ international》 |2019年第3期|559-566|共8页
  • 作者

    Tinghui MAN; Takahito OHMURA; Yo TOMOTA;

  • 作者单位

    Graduate School of Engineering, Kyushu University, 774 Motooka, Nishi-ku, Fukuoka, 819-0395 Japan;

    Graduate School of Engineering, Kyushu University, 774 Motooka, Nishi-ku, Fukuoka, 819-0395 Japan,Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047 Japan;

    Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047 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

    nanoindentation; retained austenite; martensite; mechanical stability; grain size;

    机译：纳米压痕残余奥氏体马氏体机械稳定性晶粒大小;

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