On the multiphase-field modeling of martensitic phase transformation in dual-phase steel using J2-viscoplasticity
On the multiphase-field modeling of martensitic phase transformation in dual-phase steel using J2-viscoplasticity
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DOI：
10.1088/1361-651x/aaf980
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发表时间：
2019-01
影响因子：
1.8
通讯作者：
Ephraim Schoof;C. Herrmann;Nick Streichhan;M. Selzer;D. Schneider;B. Nestler
中科院分区：
文献类型：
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作者：
Ephraim Schoof;C. Herrmann;Nick Streichhan;M. Selzer;D. Schneider;B. Nestler
在细观尺度上，双相钢（DP）由硬脆马氏体夹杂物组成，这些夹杂物嵌在软韧性铁素体基体中。在宏观尺度上，这种类似复合材料的结构是良好的可成形性和高拉伸强度的有吸引力的组合的原因。为了改善DP的性能，可以使用计算机模型来研究生产链中各种影响因素的影响。作为我们之前工作的扩展（Schoof等人2018 Int. J. Solids Struct. 134 181-94），我们将J2-粘塑性公式纳入多相场框架，以研究马氏体相变期间基于EBSD的DP微观结构中的塑性效应。每个阶段的硬化行为建模使用非线性函数。研究了塑性松弛速率对微观组织形成和残余应变的影响。讨论了在扩散界面框架中引入屈服准则的两种不同模型，并对结果进行了比较。在这种情况下，制定了塑性驱动力，并评估其对微观结构演变的影响。该模型不仅预测高值的累积塑性应变在铁素体区域，接近铁素体-马氏体晶界，但也在马氏体岛。
On the mesoscopic length scale, dual-phase steel (DP) consists of hard and brittle martensitic inclusions, which are embedded in a soft and ductile ferritic matrix. On the macroscopic scale, this composite-like structure is responsible for the attractive combination of good formability and high tensile strength. In order to improve the properties of DP, computer models can be used to investigate the effects of various influencing factors during the production chain. As an extension to our previous work (Schoof et al 2018 Int. J. Solids Struct. 134 181–94), we include a J2-viscoplasticity formulation into a multiphase-field framework to study plastic effects in an EBSD-based DP microstructure during the martensitic phase transformation. The hardening behavior of each phase is modeled using a nonlinear function. The effect of the plastic relaxation rate on the microstructure formation and the residual strains is investigated. Two different models for introducing a yield criterion into a diffuse interface framework are discussed, and the results are compared. In this context, a plastic driving force is formulated, and its influence on the microstructure evolution is evaluated. The model not only predicts high values of accumulated plastic strain in ferritic regions, close to ferrite-martensite grain boundaries, but also within martensitic islands.