Revealing the strain-hardening behavior of twinning-induced plasticity steels: Theory, simulations, experiments
Revealing the strain-hardening behavior of twinning-induced plasticity steels: Theory, simulations, experiments
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DOI：
10.1016/j.actamat.2012.09.064
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发表时间：
2013-01-01
期刊：
影响因子：
9.4
通讯作者：
Raabe, Dierk
中科院分区：
文献类型：
--
作者：
Steinmetz, David R.;Japel, Tom;Raabe, Dierk
我们提出了一种基于多尺度位错密度的本构模型，用于研究孪晶诱导塑性（TWIP）钢的应变硬化行为。该方法是一种基于物理的应变率和温度敏感模型，反映了 TWIP 钢中孪晶和位错结构的微观结构研究。该方法的一个显着优点是模型参数（其中一些是通过从头开始预测得出的）是基于物理的并且在一个数量级内已知。这允许在模型中包含更复杂的微观结构信息，而不会失去识别所有参数的合理初始值和界限的能力。包括位错单元、晶粒尺寸和孪晶体积分数演化。特别关注新变形孪晶成核的机制，并提出了临界孪晶应力的新公式。参数优化过程中包括各种温度。还考虑了耗散加热。使用物理合理的参数可以识别 Fe-22Mn-0.6C TWIP 钢示例的通用参数集。 (C) 2012 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
We present a multiscale dislocation density-based constitutive model for the strain-hardening behavior in twinning-induced plasticity (TWIP) steels. The approach is a physics-based strain rate- and temperature-sensitive model which reflects microstructural investigations of twins and dislocation structures in TWIP steels. One distinct advantage of the approach is that the model parameters, some of which are derived by ab initio predictions, are physics-based and known within an order of magnitude. This allows more complex microstructural information to be included in the model without losing the ability to identify reasonable initial values and bounds for all parameters. Dislocation cells, grain size and twin volume fraction evolution are included. Particular attention is placed on the mechanism by which new deformation twins are nucleated, and a new formulation for the critical twinning stress is presented. Various temperatures were included in the parameter optimization process. Dissipative heating is also considered. The use of physically justified parameters enables the identification of a universal parameter set for the example of an Fe-22Mn-0.6C TWIP steel. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.