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Microstructure and Micro Strain in the CGHAZ of 2.25Cr-1.6W Steel after Intercritical Heat Treatment

机译：临界热处理后2.25Cr-1.6W钢CGHAZ的组织和微应变

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摘要

Multiple microscopic analysis techniques, such as transmission electron microscope (TEM), electron backscatter diffraction (EBSD) and transmission-EBSD (T-EBSD), were used to study the microstructure and micro strain in the coarse-grained heat-affected zone (CGHAZ) of 2.25Cr-1.6W steel after strain-to-fracture (STF) tests under intercritical heat treatment temperature. This study was a supplement of previous research, which was helpful for understanding the mechanism of reduced susceptibility of reheat cracking by intercritical heat treatment. The result showed that transformation products were retained austenite and twin martensite which had many variants with different crystallographic orientation. Twin boundaries were found both in recrystallized grains and matrix near the recrystallized grains. They were not conventinal parallelling interfaces and the misorientation was not exactly equal to 60°. Transformation resulted in large strain in recrystallized grains and the strain concentration kept away from the prior austenite grain boundaries (PAGBs). Besides transformation strain, the position of recrystallization was another factor which led to different mechanisms of reduced susceptibility to ductility-dip cracking (DDC) in Ni-based alloy and reheat cracking in 2.25Cr-1.6W steel, respectively.
机译：透射电镜（TEM），电子背散射衍射（EBSD）和透射EBSD（T-EBSD）等多种显微分析技术用于研究粗粒热影响区（CGHAZ）的微观结构和微应变）在临界热处理温度下经应变-断裂（STF）测试后的2.25Cr-1.6W钢）。这项研究是对先前研究的补充，有助于理解通过临界热处理降低再热裂纹敏感性的机理。结果表明，转变产物为残留的奥氏体和孪晶马氏体，它们具有许多不同晶体学取向的变体。在重结晶晶粒和重结晶晶粒附近的基体中都发现了孪晶边界。它们不是常规的平行界面，并且取向错误不完全等于60°。相变导致重结晶晶粒中的大应变，并且应变浓度远离先前的奥氏体晶界（PAGBs）。除了相变应变，再结晶的位置是导致镍基合金延性-浸润开裂（DDC）敏感性降低和2.25Cr-1.6W钢的再热裂纹敏感性降低的不同机制。

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  • 来源
    《ISIJ international》 |2017年第12期|2201-2206|共6页
  • 作者

    Yujing JIN; Jiangping LIU; Wei ZHOU;

  • 作者单位

    Precision Manufacturing Engineering Department, Suzhou Institute of Industrial Technology, Suzhou, 215000 PR China;

    Precision Manufacturing Engineering Department, Suzhou Institute of Industrial Technology, Suzhou, 215000 PR China;

    Shagang School of Iron and Steel, Soochow University, Suzhou, 215021 PR China;

  • 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

    recrystallization; intercritical heat treatment; transformation; micro strain; 2.25Cr-1.6W steel;

    机译：重结晶临界热处理;转型;微应变2.25Cr-1.6W钢;

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