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Transformation behavior and microstructure feature of large strain ausformed low-temperature bainite in a medium C - Si rich alloy steel

机译:大应变奥氏体低温贝氏体在富C-Si合金钢中的转变行为和组织特征。

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摘要

Large-strain ausforming and low-temperature bainite transformation were carried out in a medium C - Si rich alloy steel on a thermomechanical simulator. Then, temperature-time-transformation curves of the bainite transformation after ausforming at different temperatures were obtained by dilatometry. The effects of ausforming on transformation kinetics, microstructure, and hardness of samples were studied. Results show that the entire process of bainite transformation can be accelerated by ausforming. With decreasing ausforming temperature, the transformation rates greatly increased at the initial transformation stage but slightly decreased at the final stage. Compared with non-ausformed sample, not only was the maximum growth rate in the ausformed samples larger, but the maximum growth rate also appeared earlier. In addition, the maximum rate of the ausformed bainite transformation was increased and the time of reaching the maximum rate was shortened with decreasing the ausforming temperature. The effect of ausforming on bainite transformation kinetics depended not only on the ausforming temperature and strain but also on the isothermal transformation temperature. The reduction in transformation time was increased under decreased isothermal transformation temperature. Ausforming refined the bainite plates and increased the fraction of retained austenite formed in the subsequent low-temperature isothermal transformation. Consequently, nanostructured bainite with enhanced hardness was prepared in the medium C - Si rich alloy steel.
机译:在热机械模拟器上,在中碳富硅的合金钢中进行大应变奥氏体化和低温贝氏体转变。然后,通过膨胀法获得了在不同温度下奥氏体化后的贝氏体转变的温度-时间-转变曲线。研究了奥氏体成形对样品转变动力学,微观结构和硬度的影响。结果表明,通过奥氏体化可以加速贝氏体转变的整个过程。随着奥氏体化温度的降低,相变速率在初始相变阶段大大增加,而在最后相变阶段则略有下降。与非变形样品相比,奥氏体样品的最大生长速率不仅更大,而且最大生长速率也出现得较早。另外,随着奥氏体化温度的降低,奥氏体贝氏体相变的最大速率增加,达到最大贝氏体相变的时间缩短。奥氏体化对贝氏体转变动力学的影响不仅取决于奥氏体化温度和应变,还取决于等温转变温度。在降低等温转变温度下,转变时间的减少增加了。奥氏体细化贝氏体板并增加了在随后的低温等温转变中形成的残留奥氏体的比例。因此,在中等C-Si富合金钢中制备了具有增强硬度的纳米贝氏体。

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  • 来源
    《Materials Science and Engineering》 |2017年第13期|527-534|共8页
  • 作者单位

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China;

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

    Medium C - Si rich steel; Nanostructured bainite; Ausforming; Phase transformation kinetics; Hardness;

    机译:中碳-富硅钢;纳米贝氏体;听觉相变动力学;硬度;

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