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首页> 外文期刊>ISIJ international >Hot Ductility Loss and Recovery in the CGHAZ of T23 Steel during Post-weld Heat Treatment at 750℃
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Hot Ductility Loss and Recovery in the CGHAZ of T23 Steel during Post-weld Heat Treatment at 750℃

机译：T23钢在750℃焊后热处理过程中CGHAZ的热延性损失和恢复

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摘要

The coarse grained heat affected zone (CGHAZ) of T23 steel was assessed by strain-to-fracture (STF) tests during post-weld heat treatment (PWHT) at 750℃ to investigate the microstructure changes and corresponding hot ductility. Scanning electron microscope (SEM), transmission electron microscope (TEM), and small angle x-ray scattering (SAXS) combining with JmatPro was used to study the characteristics of carbides, dislocation density, and lath size. Voids and micro-cracks were also analyzed by SEM. The results showed that sample with 1 min PWHT lost its hot ductility and intergranular cracking occurred. The hot ductility recovered with increasing PWHT time. However, the mechanisms were quite distinct during different time periods. Within PWHT time range from 0.5 h to 1.5 h, the recovery of hot ductility resulted from decreasing dislocation density. The hot ductility exhibited an opposite tendency with hardness. By contrast, the hot ductility and the hardness increased together after 2 h PWHT. It was resulted from the formation of lots of V-rich MC carbides in grain and coherent/semi-coherent smaller M_23C_6 carbides at the prior austenite grain boundaries (PAGBs). The strength of the grain interior and PAGB increased together. Plastic deformation was accommodated only by the cracking or shearing of low strength blocks. The fracture surface exhibited quasi-cleavage cracking together with dimples, which represented of good hot ductility. It could be concluded that the drastic changes of microstructure altered the manner of plastic deformation accommodation during stress relief, which led to the hot ductility loss and recovery during PWHT at 750℃.
机译：在750℃的焊后热处理（PWHT）中，通过应变断裂（STF）试验对T23钢的粗晶粒热影响区（CGHAZ）进行了评估，以研究显微组织的变化和相应的热延性。扫描电子显微镜（SEM），透射电子显微镜（TEM）和小角度X射线散射（SAXS）与JmatPro结合使用来研究碳化物的特性，位错密度和板条尺寸。空隙和微裂纹也通过SEM分析。结果表明，PWHT 1 min的样品失去了热延展性，发生了晶间裂纹。随着PWHT时间增加，热延展性恢复。但是，在不同时间段内，机制是截然不同的。在PWHT时间从0.5h到1.5h范围内，热延展性的恢复是由于位错密度的降低所致。热延展性显示出与硬度相反的趋势。相反，PWHT 2 h后的热延展性和硬度一起增加。这是由于在晶粒中形成了大量富V的MC碳化物，以及在先前的奥氏体晶界（PAGB）形成了相干/半相干的较小M_23C_6碳化物。谷物内部和PAGB的强度一起增加。塑性变形只能通过低强度砖的开裂或剪切来承受。断裂表面表现出准解理裂纹和凹痕，表现出良好的热延展性。可以得出结论，在750℃PWHT时，组织的急剧变化改变了应力释放过程中塑性变形调节的方式，从而导致了热延展性的损失和恢复。

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  • 来源
    《ISIJ international》 |2017年第3期|517-523|共7页
  • 作者

    Yujing JIN; Wei ZHOU;

  • 作者单位

    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

    hot ductility; T23 steel; CGHAZ; carbides;

    机译：热延性;T23钢;CGHAZ;碳化物;

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