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首页> 外文期刊>Materials Science and Engineering >Effect of inter-critically reheating temperature on microstructure and properties of simulated inter-critically reheated coarse grained heat affected zone in X70 steel
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Effect of inter-critically reheating temperature on microstructure and properties of simulated inter-critically reheated coarse grained heat affected zone in X70 steel

机译:临界再加热温度对X70钢模拟临界间再加热粗晶粒热影响区组织和性能的影响

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摘要

This study investigated the influence of the inter-critical reheating temperature on the microstructure and mechanical properties of a coarse grained heat affected zone (CGHAZ) in an API 5L grade X70 pipeline steel seam weld. A Gleeble 3500 thermo-mechanical simulator was employed to duplicate particular weld thermal cycles in order to accurately assess specific regions of the weld HAZ. Detailed microstructural analysis, including investigation of the martensite-austenite (M-A) constituent, was performed using optical microscope (OM), scanning electron microscope (SEM) and selective etching techniques. It is shown that the fracture toughness of the CGHAZ is significantly reduced following exposure to a subsequent inter-critical thermal cycle. Fracture toughness gradually improves as the inter-critical temperature is increased, but does not return to the value of the original CGHAZ due to the presence of isolated large M-A particles and coarse microstructure. Significance of M-A particles to the HAZ fracture toughness is first related to the location of particles along prior austenite grain boundaries, followed by the size of individual M-A particles.
机译:这项研究调查了API 5L级X70管线钢缝焊中临界再加热温度对粗粒热影响区(CGHAZ)的组织和力学性能的影响。为了准确评估焊缝热影响区的特定区域,使用了Gleeble 3500热机械模拟器来复制特定的焊缝热循环。使用光学显微镜(OM),扫描电子显微镜(SEM)和选择性蚀刻技术进行了详细的微观结构分析,包括研究马氏体-奥氏体(M-A)成分。结果表明,暴露于随后的临界间热循环后,CGHAZ的断裂韧性明显降低。随着临界温度的升高,断裂韧性逐渐提高,但由于存在孤立的大M-A颗粒和粗糙的微观结构,因此断裂韧性未恢复到原始CGHAZ的值。 M-A颗粒对HAZ断裂韧性的重要性首先与颗粒沿着先有的奥氏体晶界的位置有关,然后与单个M-A颗粒的大小有关。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第27期|8-13|共6页
  • 作者单位

    School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;

    School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;

    School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;

    School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia,CBMM Technology Suisse, 14, Rue iu Rhone, Geneva 1204, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Steel; Thermomechanical processing; Fracture; Martensitic transformations;

    机译:钢;热机械加工;断裂;马氏体转变;

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