高对比度韧性层状组织的有效各向异性粘塑性模型：板条马氏体亚结构的应用
An effective anisotropic visco-plastic model dedicated to high contrast ductile laminated microstructures: Application to lath martensite substructure
摘要：
在特定类型的层状或片状微观结构如珠光体和板条马氏体中，塑性滑移有利地发生在平行于层间边界的方向上。这可能是由于形态和结晶取向之间的相互作用，或者更一般地，由于施加在塑性滑移上的约束，由于层状微观结构的几何形状。本文提出了一种基于微观力学，计算效率高，规模独立的模型，为特定类型的层状微观结构包含较软的层状，这是足够薄，被认为是离散的滑移面嵌入在一个矩阵表示较硬的层状。相应地，该模型被构造为各向同性粘塑性模型，该模型富含附加的取向相关的平面塑性形变机制。当所施加的负载投射在软膜的方向上时，该附加模式被激活，从而引起显著量的剪切应力。否则，塑性形变仅由模型的各向同性部分控制。所提出的模型的响应进行评估，通过比较直接数值模拟（DNS）的无限周期两相层压板。结果表明，该模型的屈服行为遵循相同的行为作为参考模型。据观察，所提出的模型是高度各向异性的，和各向异性的程度取决于之间的对比度的滑移阻力（或屈服应力）的平面模式与各向同性部分。然后，该配方被施加到模拟板条马氏体与层间薄奥氏体膜的子结构。将该模型应用于双相钢微观组织的细观模拟，并与标准各向同性模型和全晶塑性模型的结果进行了比较。
英文摘要：
In particular types of layer- or lamellar-like microstructures such as pearlite and lath martensite, plastic slip occurs favorably in directions parallel to inter-lamellar boundaries. This may be due to the interplay between morphology and crystallographic orientation or, more generally, due to constraints imposed on the plastic slip due to the lamellar microstructural geometry. This paper proposes a micromechanics based, computationally efficient, scale independent model for particular type of lamellar microstructures containing softer lamellae, which are sufficiently thin to be considered as discrete slip planes embedded in a matrix representing the harder lamellae. Accordingly, the model is constructed as an isotropic visco-plastic model which is enriched with an additional orientation-dependent planar plastic deformation mechanism. This additional mode is activated when the applied load, projected on the direction of the soft films, induces a significant amount of shear stress. Otherwise, the plastic deformation is governed solely by the isotropic part of the model. The response of the proposed model is assessed via a comparison to direct numerical simulations (DNS) of an infinite periodic two-phase laminate. It is shown that the yielding behavior of the model follows the same behavior as the reference model. It is observed that the proposed model is highly anisotropic, and the degree of anisotropy depends on the contrast between the slip resistance (or yield stress) of the planar mode versus that of the isotropic part. The formulation is then applied to model the substructure of lath martensite with inter-layer thin austenite films. It is exploited in a mesoscale simulation of a dual-phase (DP) steel microstructure.The results are compared with those of a standard isotropic model and a full crystal plasticity model.
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