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The study on the threshold strain of microvoid formation in TRIP steels during tensile deformation

机译：TRIP钢拉伸变形过程中微孔形成阈值应变的研究

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摘要

Transformation Induced Plasticity (TRIP) steels exhibit a better combination of strength and ductility properties than conventional high strength low alloy (HSLA) steels, and therefore receive considerable attention in the automotive industry. In this work, the tensile mechanical behaviors of TRIP-aided steels were studied under the condition of the quasi-static and high deformed rates. The deformed specimens were observed by scanning electron microscope (SEM) along the tensile axis. The threshold strain of microvoid formation was examined quantitatively according to the evolution of deformation. The results showed that: the yield and tensile strengths of TRIP steels increase with the strain rate, whereas their elongations decrease. However, the threshold strain for TRIP steels at high strain rate is larger than that at low strain rate. Comparing with the deformed microstructure and microvoids formed in the necking zone of dual phase (DP) steel, the progressive deformation-induced transformation of retained austenite in TRIP steels remarkably increases the threshold strain of microvoid formation and furthermore postpones its growth and coalescence.
机译：相变诱导塑性（TRIP）钢与常规高强度低合金（HSLA）钢相比，具有更好的强度和延展性组合，因此在汽车工业中引起了广泛关注。在这项工作中，研究了TRIP辅助钢在准静态和高变形率条件下的拉伸力学行为。沿拉伸轴通过扫描电子显微镜（SEM）观察变形的样品。根据变形的演变，定量检查微孔形成的阈值应变。结果表明：TRIP钢的屈服强度和抗拉强度随着应变率的增加而增加，而伸长率则降低。但是，TRIP钢在高应变速率下的阈值应变大于低应变速率下的阈值应变。与双相（DP）钢缩颈区形成的变形组织和微孔相比，TRIP钢中残余奥氏体的逐步形变诱导转变显着增加了微孔形成的阈值应变，并进一步延缓了其生长和聚结。

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  • 来源
    《Materials Science and Engineering》 |2012年第1期|p.272-278|共7页
  • 作者

    Wurong Wang; Bimeng Guo; Yurong Ji; Changwei He; Xicheng Wei;

  • 作者单位

    School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

    School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    TRIP steel; dynamic tension; microvoid; threshold strain; retained austenite;

    机译：TRIP钢;动态张力微孔极限应变残余奥氏体;

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