Finite element simulation of strain induced austenite–martensite transformation and fine grain production in stainless steel

Grain refinement due to phase transformation is an effective method for improving the mechanical properties of steel. An approach is proposed in the present work based on the FEM, for numerical simulation of the microstructure evolution as a result of hot rolling and subsequent cold torsion, with evaluating of the aggregate flow stress, depending on the austenite and martensite volume fractions changes developing during strain induced phase transformation. Grain refinement in 304 stainless steel at four different technological schedules is considered. Results of numerical simulation are compared with experimental data. Coupling of the thermoplastic deformation with microstructure evolution is realized.