Constitutive modeling of ferritic stainless steel

In this work, constitutive models, including phenomenological and crystal plasticity, were used to simulate the anisotropy behavior and texture evolution of two ferritic stainless steel sheets, AISI409L and AISI430. Uniaxial tension, hydraulic bulge and disk compression tests were performed to characterize the mechanical properties of the two materials, and to determine the yield surfaces at different amounts of plastic work. Meanwhile, X-ray diffraction and electron backscatter diffraction techniques were used to analyze the texture of undeformed and deformed specimens. Crystal plasticity simulations were performed to determine the plastic behavior in selected deformation paths. The analysis of the mechanical test results showed that the yield surface shapes were changing during deformation. Crystal plasticity results indicated that texture evolution was mainly responsible for the yield surface shape change, i.e., anisotropic work-hardening, in AISI409L. For AISI430, the results were not completely consistent. More work is needed to understand the plastic behavior of this material.