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Strain-hardening behaviors of dual phase steels with microstructure features

机译：具有显微组织特征的双相钢的应变硬化行为

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摘要

Due to the inhomogeneous deformation of the microstructure, it becomes difficult as well as necessary to determine the mechanical behavior of multi-phase high strength steels precisely. In this study, the strain distribution of microstructure is obtained utilizing Point Interpolation Method (PIM). The strain of microstructure with an exponential function of overall strain presents greater deformation in Ferrite than Martensite. Considering the characteristic deformation of individual phases, a dislocation based combined strain-hardening model is proposed to describe the overall stress-strain relationship of the material. The agreement between theoretical model and experiment results is verified by DP800. Based on the model, the stress-strain response of DP steels to different grain sizes and volume fractions of individual phases is studied. The strength and strain hardening behavior of DP steels with finer Ferrite, coarser Martensite and higher content of Martensite are significantly improved. In addition, dislocation mean free path, dislocation density, strain-hardening rate and hardening exponent of individual phases are calculated to describe the strain-hardening mechanism of individual phases and DP steels.
机译：由于微观结构的不均匀变形，因此精确确定多相高强度钢的机械性能变得困难且必要。在这项研究中，利用点插值法（PIM）获得了微结构的应变分布。具有总应变指数函数的微结构应变在铁素体中的变形要比马氏体大。考虑到各相的特征变形，提出了一种基于位错的组合应变-硬化模型来描述材料的整体应力-应变关系。 DP800验证了理论模型与实验结果的一致性。基于该模型，研究了DP钢对不同相尺寸和不同相体积分数的应力应变响应。铁素体更细，马氏体更粗，马氏体含量更高的DP钢的强度和应变硬化行为得到了显着改善。此外，计算了单相的位错平均自由程，位错密度，应变硬化速率和硬化指数，以描述各个相和DP钢的应变硬化机理。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|88-97|共10页
  • 作者

    T.T. Huang; R.B. Gou; W.J. Dan; W.G. Zhang;

  • 作者单位

    Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

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

    Local deformation; Strain-hardening; Dual phase steels; Martensite; Ferrite;

    机译：局部变形;应变硬化;双相钢;马氏体铁素体;

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