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首页> 外文期刊>Materials Science and Engineering >Effects of austempering temperature on bainitic microstructure and mechanical properties of a high-C high-Si steel
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Effects of austempering temperature on bainitic microstructure and mechanical properties of a high-C high-Si steel

机译：奥氏体温度对高碳高硅钢贝氏体组织和力学性能的影响

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摘要

High tensile strength of similar to 1550 MPa, uniform elongation of similar to 30%, and impact energy of similar to 80 J were achieved in a high-C high-Si bainitic steel, by austempering around the nose-tip temperature of the time- temperature-transformation (TTT) diagram. This bainitic microstructure revealed multiple lengths of nanobainite plates and various sizes and shapes of retained austenite. Its bainite transformation during austempering and microstructure evolution during tensile deformation were discussed in depth. Results demonstrated that large blocks of retained austenite (with inhomogeneous carbon distribution) transformed partly and gradually to multiple martensite grains as strain increases, due to the strong effect of carbon on mechanical stability of retained austenite. Ductile long nanobainite plates (similar to 0.13 at% C) suppressed the propagation of microcracks, because of stress relief effect ahead of the current microcracks.
机译：通过在时间的鼻尖温度附近回火，在高碳高硅贝氏体钢中获得了接近1550 MPa的高拉伸强度，接近30％的均匀伸长率和接近80 J的冲击能。温度转换（TTT）图。这种贝氏体的微观结构揭示出纳米贝氏体板的多个长度以及残留奥氏体的各种尺寸和形状。深入讨论了其回火过程中的贝氏体转变和拉伸变形过程中的显微组织演变。结果表明，由于碳对残余奥氏体力学稳定性的强烈影响，随着应变增加，大块残余奥氏体（碳分布不均匀）部分并逐渐转变为多个马氏体晶粒。延性长纳米贝氏体板（类似于0.13 at％C）抑制了微裂纹的传播，因为当前微裂纹之前的应力释放效应。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|179-189|共11页
  • 作者

    Zhao Jiali; Lv Bo; Zhang Fucheng; Yang Zhinan; Qian Lihe; Chen Chen; Long Xiaoyan;

  • 作者单位

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, Coll Environm & Chem Engn, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, Natl Engn Res Ctr Equipment & Technol Cold Strip, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Bainitic steel; Dualphase; Multiscale; Mechanical properties;

    机译：贝氏体钢;双相;多尺度;力学性能;

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