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Inverted multi-step bainitic austempering process routes: Enhanced strength and ductility

机译:倒转多步贝氏体回火工艺路线:增强强度和延展性

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摘要

An inverted multi-step bainitic austempering process is proposed, where a low austempering temperature step is followed by a high temperature counterpart: after austenitization, the specimens were cooled to the first austempering step at 260 °C for 600 s, then were raised to the second step at 360 °C and held for 1800 s. As comparison, the conventional multi-step bainitic austempering processes were carried out: the first step is at 360 °C for 1800 s, while the second step is at 260 °C for 7200 s. Through inverted multi-step bainitic austempering process, the efficacy of reducing blocky austenite is also achieved and is comparable to that obtained by conventional multi-step bainitic austempering process. But the total time used for inverted multi-step bainitic austempering treatment is reduced markedly due to accelerating bainitic ferrite formation. Furthermore, the novel heat treatment can enhance the strength of a Mn-Si-Cr-C low-alloyed steel without sacrificing ductility, which is attributed to refining austenite and bainitic ferrite blocks.
机译:提出了一种倒转的多步贝氏体回火工艺,在该过程中先进行低等温回火,然后再进行高温对应:奥氏体化后,将试样在260°C下冷却至第一等温回火步骤600 s,然后升高至第二步是在360 C下保持1800 s。作为比较,进行了传统的多步贝氏体回火工艺:第一步在360°C下保持1800 s,第二步在260°C下保持7200 s。通过倒转多步贝氏体奥氏体回火工艺,还达到了减少块状奥氏体的功效,并且与常规的多步贝氏体奥氏体回火过程所获得的效果相当。但是,由于贝氏体铁素体的形成加快,用于多步贝氏体回火的总时间明显减少。此外,新颖的热处理可以在不牺牲延展性的情况下提高Mn-Si-Cr-C低合金钢的强度,这归因于奥氏体和贝氏体铁素体块的细化。

著录项

  • 来源
    《Materials Science and Engineering》 |2018年第24期|298-305|共8页
  • 作者单位

    Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University;

    Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University;

    Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University;

    Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University;

    Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University,Tsinghua University, Key Laboratory of Advanced Material, School of Material Science and Engineering;

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

    Bainite; Retained austenite; Strength; Ductility; Transformation kinetic;

    机译:贝氏体;残余奥氏体;强度;延展性;转变动力学;

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