DEFORMATION TEXTURES AND PLASTIC ANISOTROPY OF STEELS USING THE TAYLOR AND NONHOMOGENEOUS MODELS

The deformation textures of B.C.C. polycrystals (uniaxial tension, rol ling) and the Lankford coefficient are predicted using the Taylor mode l and a nonhomogeneous model. The mixed glide conditions {110}<111> {112}<111> are imposed using the yield polyhedron proposed by Orlans-J oliet et al. [1988]. The nonhomogeneous model is based on the Arminjon model [1987]; however, Arminjon used the pencil glide condition. An o riginal calculation is proposed to simulate with a high precision defo rmation textures (orientation distribution functions O.D.F.F'(g)), wit hout using the harmonic method, which leads to truncation errors. No r estrictions are imposed on the eventual symmetry of the initial O.D.F. F'(g). Using experimental and calculated textures of low carbon steels , it is shown that the homogeneous Taylor model gives good results for low deformations (uniaxial tension), whereas the nonhomogeneous model improves the Taylor model for high deformations (rolling).