A crystallographic extension to the Olson-Cohen model for predicting strain path dependence of martensitic transformation

A crystallographic extension to the Olson-Cohen model for predicting strain path dependence of martensitic transformation
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用于预测马氏体转变应变路径依赖性的 Olson-Cohen 模型的晶体学扩展

DOI:
10.1016/j.actamat.2018.12.060
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发表时间:
2019
期刊:
影响因子:
9.4
通讯作者:
Knezevic, Marko
Knezevic, Marko
中科院分区:
材料科学1区
文献类型:
--
作者:
Zecevic, Milovan;Upadhyay, Manas V.;Polatidis, Efthymios;Panzner, Tobias;Van Swygenhoven, Helena;Knezevic, Marko

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对Olson-Cohen应变诱发奥氏体-马氏体相变动力学模型进行了修正。建议的动力学模型占在晶粒水平的应力状态和晶体学的转变机制。模型中引入了两种对局部应力状态敏感的相变机制。首先,在垂直于Burgers矢量的方向上的滑移平面上的解析剪切应力确定堆垛层错宽度(SFW),其进而确定潜在的成核位点。第二,应力三轴度决定了形核位置上结构α′马氏体形成的概率。将该动力学模型应用于EPSC晶体塑性模型,研究了亚稳奥氏体钢应变诱发α′马氏体相变的应力状态和织构依赖性以及力学响应。模拟进行了比较,从不同的奥氏体钢进行简单的拉伸,平面应变拉伸,等双轴拉伸,简单的压缩和扭转的实验机械和相分数的数据。结果表明,α′-马氏体相分数的适当建模允许捕获实验测量的机械响应。本文讨论了这些预测的实施和见解,包括马氏体相变织构演变的作用。
A modification to the empirical Olson-Cohen strain-induced austenite to martensite transformation kinetic model is proposed. The proposed kinetic model accounts for the stress state at the grain level and the crystallography of the transformation mechanism. Two transformation mechanisms sensitive to the local stress state are incorporated in the model. First, the resolved shear stress on a slip plane in the direction perpendicular to the Burgers vector determines the stacking fault width (SFW) which in turn determines the potential nucleation sites. Second, the stress triaxiality governs the probability of the structuralα′-martensite formation at a nucleation site. The kinetic model is implemented in the elasto-plastic self-consistent (EPSC) crystal plasticity model to study the stress state and texture dependence of the strain-inducedα′-martensite transformation and the mechanical response of metastable austenitic steels. The simulations are compared with experimental mechanical and phase fraction data from different austenitic steels subjected to simple tension, plane strain tension, equibiaxial tension, simple compression, and torsion. It is demonstrated that the appropriate modeling ofα′-martensite phase fractions allows capturing the experimentally measured mechanical response. The implementation and insights from these predictions, including the role of texture evolution on martensite transformation, are discussed in this paper.
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