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An RVE-Based Study of the Effect of Martensite Banding on Damage Evolution in Dual Phase Steels

机译：基于RVE的马氏体束带对双相钢损伤演变影响的研究

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The intent of this work is to numerically investigate the effect of second phase morphology on damage evolution characteristics of dual-phase (DP) steels. A strain gradient enhanced crystal plasticity framework is used in order to capture the deformation heterogeneity caused by lattice orientations and microstructural size effects. The investigation is focused on two different martensite distributions (banded and random) that are relevant for industrial applications. The effects of martensite morphology are compared by artificially generated 2D plane strain microstructures with initial void content. The Representative volume elements (RVEs) are subjected to tensile deformation imposed by periodic boundary conditions. Evolution of voids are analyzed individually as well as a whole and characterized with respect to average axial strain. It is found that during stretching voids exhibit varying evolution characteristics due to generation of inhomogeneous strain fields within the structure. The behavior of individual voids shows that the stress-state surrounding the void is different from the imposed far field macroscopic stress-state. The voids at the ferrite martensite interface and in ferrite grains of the randomly distributed martensite grow more than in the banded structure. On the other hand, voids formed by martensite cracking growth shows an opposite trend.
机译：这项工作的目的是通过数值研究第二相形态对双相（DP）钢的损伤演变特征的影响。为了捕获由晶格取向和微观结构尺寸效应引起的变形异质性，使用了应变梯度增强的晶体可塑性框架。研究集中在与工业应用相关的两种不同的马氏体分布（带状和随机）。通过人工产生的具有初始空隙含量的二维平面应变微观结构，比较了马氏体形态的影响。代表性体积元素（RVE）受到周期性边界条件施加的拉伸变形。分别对空洞的演化以及整体进行分析，并针对平均轴向应变进行表征。发现在拉伸期间，由于结构内不均匀的应变场的产生，空隙表现出变化的演化特性。单个空隙的行为表明，围绕空隙的应力状态与施加的远场宏观应力状态不同。铁素体马氏体界面和无规分布马氏体的铁素体晶粒中的空隙比带状组织中的空隙增长更多。另一方面，由马氏体裂纹扩展形成的空隙显示出相反的趋势。

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