COMPARISON OF THE ROLLING TEXTURE FORMATION IN DUPLEX STEELS WITH VARIOUS INITIAL TEXTURES

摘要

In the present work the effect of the initial orientation distribution on texture development is analysed in two duplex type steels, XlCrNi24-6 and X4CrNiMo24-6-2, subjected to cold-rolling. Both steels under examination showed very different intensities of the initial textures after the preliminary thermo-mechanical treatment, namely; clearly defined strong textures of ferrite and austenite in steel XlCrNi24-6 and nearly random textures of both constituent phases in the case of steel X4CrNiMo24-6-2. Comparison of texture formation indicates that essentially both duplex steels show tendency to develop the rolling textures of the constituent phases close to those in single phase steels. In both cases however the process proceeds in different way and the final textures display certain important differences in comparison to the typical ferrite and austenite textures. In the case of the steel with strong initial orientations the formation of the rolling textures consists in spread of the starting textures however the major orientation components in both phases are stable up to high rolling reductions. On the other hand in the steel with random initial orientations a gradual formation of deformation textures is observed in the course of rolling with simultaneous formation of ferrite and austenite bands. It is concluded that in both cases the formation and character of the final deformation textures is strongly influenced by the band-like morphology of two-phase structure.