Investigation of the development of the cold rolling texture in deep drawing steels by ODF-analysis

Abstract

The development of textures during cold rolling has been investigated with the help of orientation distribution function (ODF) analysis. It has been found that the cold rolling textures of these steels can be described by a partial “α-fibre” with 〈110〉 ∥RD stretching from {001}〈110〉 to {111}〈110〉, and a complete “γ-flbre” with 〈111〉∥ND; the {112}〈110〉-component becomes increasingly pronounced at higher deformations. It could be shown for the present work and also for the work of other authors that the “β-fibre” predicted by the Taylor theory and comprising the series of orientations between {112}〈110〉 and {11 11 8}〈44 11〉 does not exist. This fibre which has been reported in some early works supporting the Taylor Model is only a result of false impression caused by the strong overlapping between {112}〈110〉 and the γ-fibre. The present results show that the Taylor Theory is not applicable but that the rolling texture development can be predicted by modified theories such that the plain strain compression is superimposed by shearing in the rolling plane; up to the rolling reductions of 70% this shearing occurs in rolling direction and above this in both rolling and transverse directions.