Finite Element Simulation of Martensitic Transformation in Single-crystal TRIP steel Based On Crystal Plasticity Theory With Cellular Automata Approach

摘要

Due to the strain-induced martensitic transformation (SIMT), the strength, ductility and toughness of TRIP steel are enhanced. The deformation behavior of TRIP steel is mainly yielded on this SIMT behavior and the deformation behaviors of the austenitic and martensitic phases. TRIP steel possesses such favorable mechanical properties due to the appropriate combination of these behaviors. However, the SIMT and deformation behavior of each phase strongly depend on the temperature and strain rate imposed, the excellent mechanical properties are realized under quite restricted circumstances. Here, the constitutive equation for single crystal TRIP steel including transformation strain on the each variant system is formulated based on continuum crystal plasticity theory. Then, the deformation behavior with patterning process of martensitic phase is simulated under plane strain condition by introducing formulated constitutive equation to FEM with cellular automata approach.