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The sources of the micro stress and strain inhomogeneity in dual phase steels

机译：双相钢中微应力和应变不均匀性的来源

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摘要

The microstructure of dual phase steels comprises of ferrite phase, reinforced by martensite grains. Computational modeling has been developed to study the dual phase steels behaviors at microstructure level. Inhomogeneity of the material response in the micro level is the key difference between macro and micro levels. Correct prediction of stress and strain inhomogeneity can lead to a better estimation of material behaviors like damage. The various orientations and shapes of the grains are well-known sources of the inhomogeneity. Change of the mechanical properties of the ferrite phase with distance from the martensite boundary is another source that is recently detected. In this paper, a new method is proposed to consider this phenomenon in finite element modeling of dual phase steels microstructure. Two types of finite element models were created based on SEM images. In the first model, grains and boundaries are directly created from the SEM images, while the second model uses a Voronoi type algorithm to construct geometries. In the second model crystal plasticity constitutive law is also employed to model the ferrite and martensite grains behavior. It is observed that by considering the ferrite phase inhomogeneity, the model can predict macro stress precisely and a better prediction of shear band formation compared to the homogeneous models is obtained.
机译：双相钢的显微组织由马氏体晶粒增强的铁素体相组成。已经开发了计算模型来研究微观结构水平下的双相钢行为。微观层面上材料响应的不均匀性是宏观层面与微观层面之间的关键差异。对应力和应变不均匀性的正确预测可以导致对材料行为（如损坏）的更好估计。晶粒的各种取向和形状是不均匀性的众所周知的来源。铁素体相的机械性能随距马氏体边界距离的变化是最近发现的另一种来源。本文提出了一种在双相钢组织的有限元建模中考虑该现象的新方法。基于SEM图像创建了两种类型的有限元模型。在第一个模型中，直接从SEM图像创建晶粒和边界，而在第二个模型中，使用Voronoi型算法构造几何形状。在第二个模型中，晶体可塑性本构定律也用于模拟铁素体和马氏体晶粒的行为。观察到，通过考虑铁素体相的不均匀性，该模型可以精确地预测宏观应力，并且与均匀模型相比，可以更好地预测剪切带的形成。

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