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Correlation between deformation behavior and austenite characteristics in a Mn-Al type TRIP steel

机译：Mn-Al型TRIP钢的变形行为与奥氏体特性的相关性

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摘要

We investigate here the correlation between deformation behavior and retained austenite characteristics in a medium-Mn transformation-induced plasticity (TRIP) steel. The sample was characterized by a dual-phase microstructure consisting of ultra-fine grained ferrite and retained austenite with relatively high mechanical stability after annealing at 700 °C for 5 h. Both lath-like and blocky (granular) retained austenite with volume fraction of 38.7% and relatively inhomogeneous grain size was obtained. The tensile specimen exhibited outstanding mechanical properties with yield strength of 745 MPa, tensile strength of 1005 MPa and total elongation of 46%, as well as a distinctive work hardening behavior. The in-depth investigation on deformation behavior demonstrated that the transformation mechanism of retained austenite during deformation was strain-induced and the yielding behavior was controlled mainly by the deformation of soft ferrite phase. As to the multi-peak work hardening behavior, it is believed to be attributed to the inhomogeneous and discontinuous occurrence of TRIP effect, which resulted from the inhomogeneous stability of retained austenite. Moreover, the orientation of retained austenite (Schmid factors) was proved an important factor in determining the mechanical stability of retained austenite upon deformation, in addition to the heterogeneity of grain size. These two factors together resulted in the inhomogeneous stability of retained austenite.
机译：我们在这里研究中锰转变诱发塑性（TRIP）钢的变形行为与残余奥氏体特性之间的相关性。样品的特征在于由超细晶粒铁素体和残余奥氏体组成的双相显微组织，在700°C退火5 h后具有相对较高的机械稳定性。板条状和块状（粒状）残余奥氏体均占38.7％的体积分数，且晶粒尺寸相对不均匀。拉伸试样具有出色的机械性能，屈服强度为745 MPa，拉伸强度为1005 MPa，总伸长率为46％，并且具有独特的加工硬化性能。对变形行为的深入研究表明，变形过程中残余奥氏体的转变机制是应变诱发的，屈服行为主要受软铁素体相变形的控制。关于多峰加工硬化行为，据认为是由于残余奥氏体的不均匀稳定性引起的TRIP效应的不均匀和不连续的出现。此外，除了晶粒尺寸的不均匀性外，还证明了残余奥氏体的取向（Schmid因子）是决定残余奥氏体变形时机械稳定性的重要因素。这两个因素共同导致残留奥氏体的不均匀稳定性。

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  • 来源
    《Materials Science and Engineering》 |2017年第20期|126-135|共10页
  • 作者

    Y.B. Xu; Y. Zou; Z.P. Hu; D.T. Han; S.Q. Chen; R.D.K. Misra;

  • 作者单位

    State Key Laboratory of Rotting and Automation, Northeastern University, Shenyang 110819, China;

    State Key Laboratory of Rotting and Automation, Northeastern University, Shenyang 110819, China;

    State Key Laboratory of Rotting and Automation, Northeastern University, Shenyang 110819, China;

    State Key Laboratory of Rotting and Automation, Northeastern University, Shenyang 110819, China;

    State Key Laboratory of Rotting and Automation, Northeastern University, Shenyang 110819, China;

    Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical Materials and Biomedical Engineering, University of Texas El Paso, TX 79968, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Medium-Mn steel; Work hardening behavior; Inhomogeneous TRIP effect; Austenite stability;

    机译：中锰钢工作硬化行为;TRIP效果不均;奥氏体稳定性;

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