Crystal plasticity modeling of 3rd generation multi-phase AHSS with martensitic transformation
Crystal plasticity modeling of 3rd generation multi-phase AHSS with martensitic transformation
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DOI：
10.1016/j.ijplas.2019.03.010
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发表时间：
2019-09-01
影响因子：
9.8
通讯作者：
Pourboghrat，Farhang
中科院分区：
文献类型：
--
作者：
Park，Taejoon;Hector，Louis G.;Pourboghrat，Farhang
基于速率无关晶体塑性理论，建立了一种系统的本构模型和标定方法，用于预测采用淬火和分配（Q&P）工艺制备的第三代多相先进高强度钢（3GAHSS）的准静态宏观行为。在本构关系中，考虑了Bain应变、晶格不变量剪切变形以及母相奥氏体和相变马氏体之间的取向关系，描述了残余奥氏体的弹塑性变形引起的马氏体相变。每个马氏体变体演变的量通过约束残余奥氏体的塑性变形以在相变期间具有最小能量的优化方案获得。原位高能X射线衍射（HEXRD）拉伸试验数据被用于表征和校准的材料模型。通过迭代执行晶体塑性有限元（CPFE）模拟，直到模拟的应力-应变曲线与原位HEXRD的实验测量曲线相匹配，分别获得每个相的基于位错密度的硬化参数。利用Dream.3D和MTEX Matlab工具箱软件生成3GAHSS的3D代表性体积元素（RVE）。基于测量的EBSD数据分析了晶粒尺寸和晶体取向的分布，并在3D RVE的生成中占。为了验证和确认的本构模型，晶体塑性有限元模拟的单轴拉伸试验进行了使用开发的材料模型和生成的3D RVE。还通过操纵相体积分数、相变速度和相性质来产生额外的假设RVE，以确定这些虚拟3GAHSS钢是否具有改善的机械性能。此外，成形极限曲线（FLC）的多相3GAHSS预测从CPFE模拟结果。
A systematic constitutive modeling and calibration methodology were developed based on rate-independent crystal plasticity to predict the quasi static macroscopic behavior of 3rd generation multiphase advanced high strength steels (3GAHSS) prepared with a quenching and partitioning (Q&P) process. In the constitutive law, martensitic phase transformation induced by the elastic-plastic deformation of the retained austenite is represented by considering the Bain strain, the lattice invariant shear deformation, and the orientation relationship between parent austenite and transformed martensite. The amount that each martensite variant evolves is obtained through an optimization scheme that constrains the plastic deformation of the retained austenite to have minimum-energy during phase transformation. In-situ high energy X-ray diffraction (HEXRD) tensile test data was utilized for the characterization and calibration of the material model. Dislocation density based hardening parameters were separately obtained for each phase by iteratively performing crystal plasticity finite element (CPFE) simulations until the simulated stress-strain curves matched the experimentally measured curves from in-situ HEXRD. The 3D representative volume element (RVE) for the 3GAHSS was generated by utilizing Dream.3D and the MTEX Matlab toolbox software. The distributions of grain size and crystal orientation were analyzed based on the measured EBSD data and accounted for in the generation of the 3D RVE. For verification and validation of the constitutive model, crystal plasticity finite element simulations of a uniaxial tensile test were performed using the developed material model and the generated 3D RVE. Additional hypothetical RVEs were also generated by manipulating phase volume fractions, phase transformation speed, and phase properties to determine if these virtual 3GAHSS steels have improved mechanical properties. Also, forming limit curves (FLC) for the multiphase 3GAHSS were predicted from the CPFE simulation results.