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Characterization of retained austenite in a low carbon high strength Mn-Si-Cr steel

机译：低碳高强度Mn-Si-Cr钢中保留奥氏体的表征

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摘要

The microstructure and the mechanical properties of the low carbon high strength (LCHS) Mn-Si-Cr steel treated by the novel quenching and dynamic-partitioning (QDP) process are investigated in detail. All samples exhibit a better performance of tensile strength and impact toughness compared with conventional LCHS steels. The higher impact toughness is closely related to the stability of retained austenite (RA), which is determined by the morphology and the carbon content. The filmy RA between martensite laths as well as the nano-sized RA inside martensite laths can effectively improve toughness. The crystallographic features of the RA are studied in depth and the crystal plane indices of facets are accurately characterized. The near-coincidence-sites (NCS) model is applied to further analyze the interfacial structures of the nano-sized RA in the given orientation relationship. The observed facets tend to contain the high-planar density of NCS clusters. The study provides some references for the research on the phase transformation of high-strength steels.
机译：通过新型淬火和动态分配（QDP）处理的低碳高强度（LCHS）MN-Si-Cr钢的微观结构和机械性能进行了详细研究。与常规LCHS钢相比，所有样品均表现出抗拉强度和冲击韧性的更好性能。较高的冲击韧性与保留奥氏体（RA）的稳定性密切相关，其由形态和碳含量决定。 Martensite Laths之间的薄膜RA以及马氏体车床内部的纳米尺寸Ra可以有效地提高韧性。在深度中研究了RA的晶体特征，并且精确地表征了面部的晶面指标。近巧合 - 位点（NCS）模型用于进一步分析给定取向关系中纳米大小Ra的界面结构。观察到的方面倾向于含有NCS簇的高平面密度。该研究为高强度钢的相变研究提供了一些参考。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|139985.1-139985.7|共7页
  • 作者

    Jiajia Qiu; Min Zhang; Xinyang Liu; Xinxin Zhang; Zhunli Tan;

  • 作者单位

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

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

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

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

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

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Retained austenite; Near-coincidence sites; Interface; Martensite; Low carbon high strength steel;

    机译：保留奥氏体;近巧克力;界面;马氏体;低碳高强度钢;

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