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Ultrahigh strength-toughness combination in Bainitic rail steel: The determining role of austenite stability during tempering

机译:贝氏体钢中的超高强度-韧性组合:回火过程中奥氏体稳定性的决定性作用

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摘要

We elucidate here the impact of tempering on the stability of retained austenite (RA) in obtaining excellent combination of strength and toughness in an ultrahigh-strength low carbon air-cooled bainitic rail steels. The microstructure of rail steels comprises of bainite, martensite and martensite/austenite (M/A) constituents. The bainitic rail steels exhibit excellent strength and toughness combination after tempering at 280 ℃ (ultimate tensile strength: 1388 MPa; total elongation: 16%; U-notch impact toughness at 20 ℃: 130 J/cm~2). The filmy RA in the tempered microstructure has high mechanical stability, which ensures retention of superior mechanical properties of bainitic steels. The study underscores stability of filmy retained austenite obtained via tempering is the underlying reason for superior mechanical properties.
机译:我们在这里阐明回火对残余奥氏体(RA)稳定性的影响,以便在超高强度低碳风冷贝氏体钢中获得强度和韧性的优异组合。轨道钢的微观结构包括贝氏体,马氏体和马氏体/奥氏体(M / A)成分。贝氏体钢在280℃回火后表现出优异的强度和韧性组合(最终抗拉强度:1388 MPa;总伸长率:16%; 20℃时U形缺口冲击韧性:130 J / cm〜2)。回火组织中的薄膜状RA具有很高的机械稳定性,可确保保留贝氏体钢的优异机械性能。该研究强调了通过回火获得的薄膜状残余奥氏体的稳定性是优异机械性能的根本原因。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第26期|162-168|共7页
  • 作者单位

    Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;

    Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical Materials and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968-0520, USA;

    Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China,Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

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

    Bainite; Rail steel; Retained austenite; Tempering; Mechanical property;

    机译:贝氏体轨道钢;残余奥氏体;回火机械性能;
  • 入库时间 2022-08-17 13:41:49

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