Material properties calibration for 316 L steel using polycrystalline model

In recent years crystal plasticity models that account for inhomogeneous nature of materials and realistic modelling of grain geometry have been receiving increasing attention. This paper presents a procedure for calibrating material properties of such a model. The material properties include the anisotropic elastic and crystal plasticity material parameters that are calibrated for monotonic loading of AISI 316L steel. Polycrystal elastic parameters are derived using average of Voigt and Reuss asymptotic estimates. For the crystal plasticity material parameters a systematic sensitivity study using Pierce et al. hardening law is performed. First, a basic sensitivity study of material parameters is performed on a model with 14 grains. Next, a model with 212 grains is used to obtain the appropriate crystal plasticity material properties. This is followed by a statistical analysis of scatter of results for different grain geometries and sets of crystallographic orientations. The results show that different grain geometries result in slightly higher scatter of numerical tensile test curves than different sets of crystallographic orientations. The mean numeric tensile curves are in good agreement with the measured true strain-stress curves. (authors)