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首页> 外文期刊>Materials Science and Engineering >Strain rate effects on tensile deformation behaviors for Fe-22Mn-0.6C-(1.5Al) twinning-induced plasticity steel
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Strain rate effects on tensile deformation behaviors for Fe-22Mn-0.6C-(1.5Al) twinning-induced plasticity steel

机译：应变速率对Fe-22Mn-0.6C-（1.5Al）孪晶诱导塑性钢拉伸变形行为的影响

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摘要

In this study, the effect of strain rate on the tensile deformation behavior of Fe-22Mn-0.6C-(1.5Al) (wt%) twinning-induced plasticity (TWIP) steel was investigated. The experimental results indicated that the work hardening exponent (n), ultimate tensile strength (σ_u) and the uniform elongation (δ_u) decreased with increasing strain rates (from 10~(-4) to 10° s~(-1)). This phenomenon exhibited negative strain rate sensitivity (NSRS), and the strain rate sensitivity value (m) was observed to be higher in the aluminum added FeMnC TWIP steel. In order to gain an in-depth understanding of this sensitivity and the subsequent effect of aluminum, the present research focused on the deformation twins and conducted comparative studies on their influence in terms of fractions (F), thickness (t) and spacing (s). Additionally, a twin boundary affected zone (TBAZ) model was proposed, where the relation between higher strain rates were directly applicable to the reduction of interfaces between the matrix and deformation twins. These result indicated that fewer sessile dislocations could be accommodated at high strain rates, thus weakening the work hardening ability. Finally, model calculations were performed to validate the findings, where TBAZ region fractions in FeMnC-Al were observed to be higher than that in FeMnC, corresponding to the increased strain rate sensitivity.
机译：在这项研究中，研究了应变速率对Fe-22Mn-0.6C-（1.5Al）（wt％）孪生诱导塑性（TWIP）钢的拉伸变形行为的影响。实验结果表明，加工硬化指数（n），极限抗拉强度（σ_u）和均匀伸长率（δ_u）随着应变率的增加而降低（从10〜（-4）到10°s〜（-1））。该现象表现出负应变速率敏感性（NSRS），并且在添加铝的FeMnC TWIP钢中观察到应变速率敏感性值（m）更高。为了深入了解铝的敏感性和后续效应，本研究着重于变形孪晶，并就分数（F），厚度（t）和间距（s）进行了比较研究。 ）。另外，提出了孪晶边界影响区（TBAZ）模型，其中较高应变率之间的关系直接适用于基体与变形孪晶之间界面的减少。这些结果表明，在高应变率下可容纳较少的固晶位错，从而削弱了加工硬化能力。最后，进行模型计算以验证发现，其中观察到FeMnC-Al中的TBAZ区域分数高于FeMnC中的TBAZ区域分数，这对应于应变率敏感性的增加。

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  • 来源
    《Materials Science and Engineering》 |2014年第23期|551-558|共8页
  • 作者

    H.K. Yang; Z.J. Zhang; F.Y. Dong; Q.Q. Duan; Z.F. Zhang;

  • 作者单位

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

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  • 正文语种 eng
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  • 关键词

    TWIP steel; Strain rate; Deformation twinning; Strength; Negative strain rate sensitivity (NSRS);

    机译：TWIP钢;应变率;变形孪晶;强度;负应变率敏感性（NSRS）;

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