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首页> 外文期刊>Materials Science and Engineering >Effect of fresh martensite on the stability of retained austenite in quenching and partitioning steel
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Effect of fresh martensite on the stability of retained austenite in quenching and partitioning steel

机译：新鲜马氏体对淬火和分区钢中残余奥氏体稳定性的影响

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摘要

Restrictions on fuel consumption and safety in the automotive industry have stimulated the development of quenching and partitioning (Q&P) steel. This steel is expected to have very high strength in combination with acceptable ductility owing to its microstructure consisting of martensite with a considerable amount of retained austenite. The effect of retained austenite on the mechanical properties and its transformation stability were determined by stepwise uniaxial micro-tensile testing and subsequent electron backscatter diffraction (EBSD) study of a pre-selected region. The austenite fraction evolution with increasing plastic deformation and the influence of fresh martensite on the local strain distribution were quantified based on the orientation data. The decrease of the retained austenite as a function of the applied strain was described by an exponential function with the pre-exponential and exponential factors related to the starting austenite fraction and its transformation stability respectively. It was proven that the presence of fresh martensite has a negative influence on this austenite transformation stability due to its constraining effect on the strain distribution. This effects the mechanical properties manifested by changes in the strain hardening behavior and total elongation. The results suggest that the ductility of the Q&P steels can be improved by an appropriate design of the heat treatment schedule in order to ensure high retained austenite fractions without the presence of fresh martensite in the final microstructure.
机译：汽车行业对燃料消耗和安全的限制刺激了淬火和分区（Q＆P）钢的发展。由于这种钢的微观结构包括马氏体和大量的残余奥氏体，因此有望具有很高的强度和可接受的延展性。通过逐步单轴微拉伸试验以及随后对预选区域的电子背散射衍射（EBSD）研究，确定了残余奥氏体对力学性能及其转变稳定性的影响。基于取向数据，量化了随着塑性变形增加的奥氏体成分的演化以及新鲜马氏体对局部应变分布的影响。残余奥氏体的减少是所施加应变的函数，这是通过指数函数来描述的，其中预指数和指数因子分别与起始奥氏体分数及其相变稳定性有关。事实证明，新鲜马氏体的存在由于其对应变分布的约束作用而对该奥氏体相变稳定性具有负面影响。这会影响由应变硬化行为和总伸长率变化所表现出的机械性能。结果表明，可以通过适当设计热处理方案来提高Q＆P钢的延展性，以确保在最终的显微组织中不存在新鲜马氏体的情况下确保高残留奥氏体含量。

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  • 来源
    《Materials Science and Engineering》 |2014年第6期|107-115|共9页
  • 作者

    Dorien De Knijf; Roumen Petrov; Cecilia Foejer; Leo A.I. Kestens;

  • 作者单位

    Department of Materials Science and Engineering, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Ghent, Belgium;

    Department of Materials Science and Engineering, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Ghent, Belgium,Department Material Science and Engineering, TU Delft, Mekelweg 2, NL-2628 CD Delft, The Netherlands;

    ArcelorMittal Global R&D Gent, Pres. J. F. Kennedylaan 3, B-9060 Zelzate, Belgium;

    Department of Materials Science and Engineering, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Ghent, Belgium,Department Material Science and Engineering, TU Delft, Mekelweg 2, NL-2628 CD Delft, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    Quenching and partitioning; Electron back-scattered diffraction (EBSD); Austenite-to-martensite transformation; Deformation;

    机译：淬火和分区;电子背散射衍射（EBSD）;奥氏体到马氏体的转变;形变;

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