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首页> 外文期刊>ISIJ international >Microstructure Evolution during Reverse Transformation of Austenite from Tempered Martensite in Low Alloy Steel
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Microstructure Evolution during Reverse Transformation of Austenite from Tempered Martensite in Low Alloy Steel

机译：低合金钢中回火马氏体奥氏体反向转变过程中的组织演变

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摘要

Microstructure evolution during the reverse transformation of low alloy steel consisting of lath martensite and chromium carbide was examined using in-situ electron backscatter diffraction at high temperatures. Austenite grains nucleated during the reverse transformation were categorized into two types: austenite grains nucleated along the lath boundaries with almost the same crystal orientation as the prior austenite (type A), and austenite grains nucleated at the prior austenite grain boundaries or inside the prior austenite grains with a different crystal orientation (type B). After the reverse transformation was finished, the prior austenite grains were reconstructed by the rapid growth and coalescence of type-A grains, which was called the "austenite memory phenomenon." Here, misorientation remained in the reconstructed austenite grains. Hence, upon heating to a higher temperature, type-A grains were invaded and were eventually replaced by type-B grains, resulting in a new fine-grained microstructure; this was similar to recrystallization. Therefore, these results showed that the austenite memory phenomenon occurred when the nucleation and growth of type-A grains was more dominant than those of type-B grains and that the degree of grain refinement depended on the nucleation and growth rate of the type-B grains.
机译：使用高温下的原位电子背散射衍射研究了由板条马氏体和碳化铬组成的低合金钢反向转变过程中的组织演变。在逆相变过程中成核的奥氏体晶粒分为两种类型：沿板条边界成核的奥氏体晶粒，其晶体取向与先前的奥氏体（A型）几乎相同，以及在先前的奥氏体晶界或内部的奥氏体成核的奥氏体晶粒。具有不同晶体取向的晶粒（B型）。反向转变完成后，通过A型晶粒的快速生长和聚结重建了先前的奥氏体晶粒，这被称为“奥氏体记忆现象”。在这里，取向错误保留在重建的奥氏体晶粒中。因此，在加热到更高的温度时，A型晶粒被侵入，并最终被B型晶粒替代，从而产生了新的细晶粒组织。这类似于重结晶。因此，这些结果表明，当A型晶粒的成核和生长比B型晶粒的成核和生长更占优势时，发生奥氏体记忆现象，并且晶粒细化的程度取决于B型晶粒的成核和生长速率。谷物。

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  • 来源
    《ISIJ international》 |2017年第3期|533-539|共7页
  • 作者

    Tomoya SHINOZAKI; Yo TOMOTA; Tatsuya FUKINO; Tetsuya SUZUKI;

  • 作者单位

    Steel Casting and Forging Division, Kobe Steel, Ltd., 2-3-1 Shinhama Arai-cho, Takasago, Hyogo, 676-8670 Japan;

    National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047 Japan;

    TSL Solutions, Ltd., SIC2-401, 5-4-30 Nishihashimoto, Midori-ku, Sagamihara, Kanagawa, 252-0131 Japan;

    Department of Materials Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511 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

    reverse transformation; austenite memory; tempered martensite; recrystallization; variant selection;

    机译：逆相变;奥氏体记忆;回火马氏体;再结晶;变体选择;

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