A crystal plasticity investigation on the influence of orientation relationships on texture evolution during rolling in fcc/bcc two phase materials

In two phase materials like duplex stainless steels that contain both the phases in nearly equal proportions, the crystallographic texture in the phases is related by special orientation relationship (OR). Most of the studies related to ORs are focused on characterising the type of ORs due to phase transformations and recrystallisation. However, very little is known about the stability of ORs and their role in the texture evolution during deformation. In this work, we present a detailed study on the role of ORs in the texture evolution during rolling in fcc/bcc two phase materials. Three different ORs; Bain, Kurdjumov-Sachs, Nishiyama-Wassermann and two different parent phases; fcc and bcc are considered. Using three-dimensional representative volume element (RVE) based crystal plasticity fast Fourier simulations, we report that the final textures depend strongly on the initial parent phase textures and the existence of an OR, and is independent of the type of the OR. A copper type texture is observed in the fcc phase, when the parent phase is bcc with cube texture. However, a brass type texture is observed when the parent phase is bcc with rotated cube texture. A detailed investigation using a series of bicrystal studies further revealed that even within an OR, the type of Bain variant plays a vital role in the overall texture evolution. It is also observed that there is no marked impact of the initial CRSS ratios and strain hardening on final textures of both the parent and child phases.