Modelling of strain-induced martensite formation in advanced medium-Mn automotive sheet steel

Abstract The modelling of strain-induced martensite formation is simulated in advanced medium-Mn steel. The fraction of retained austenite (8%) embedded in the bainitic matrix is transforming into the strain-induced martensite during progressive static tensile tests. The originally elaborated technique and algorithms (using C++ language) are presented. The finite element method and LS-DYNA (LSTC Company, USA) have been deployed. The calculations of the stress-induced martensite start temperature were performed to characterize the austenite stability. The structural investigations using the SEM and EBSD have been conducted. The comparison of the experimental and numerical results has been made in terms of mechanical austenite stability.