Bain variant dependent plastic anisotropy and formability in duplex stainless steels

摘要

Crystallographic texture is known to have significant effect on the plastic anisotropy and formability in materials. In single phase materials, the texture is often a function of prior thermomechanical processing. However in materials with multiple phases such as duplex stainless steels (DSS), the texture is also influenced by the orientation relationship (OR) maintained during the phase transformations. In the present work, we study the role of OR and their Bain variant classifications on the plastic anisotropy and, in turn, on the formability of DSS. Crystal plasticity modelling is used to calculate the in-plane anisotropy of the r-values for DSS with different initial austenite textures. Further, finite element simulations of the deep drawing process are presented to obtain the earing profiles and show the Bain variant dependency on the formability.