Investigation of the development of the recrystallization textures in deep drawing steels by ODF analysis

Abstract

The formation of recrystallization textures (particularly of the {111} textures) in various low-C steels has been examined in detail by application of the ODF (Orientation Distribution Function) method and by varying the important parameters chemical composition, time and temperature of annealing, rate of heating, and degree of cold rolling. After the present results, the recrystallization textures of steels can be represented by the orientations concentrated on an incomplete fibre (001)[11̄0]-(111)[11̄0], (called α), on a complete fibre (111)[11̄0]-(111)[1̄1̄2] (called γ) and, in some cases on a complete fibre (001)[100]-(011)[100] (called η) around the Goss component. It is proposed to use the orientation density ƒ( g) along these area fibres as a simple “labelling” of the steel with respect to the textural state. The development of recrystallization textures is shown to be decisively affected by pinning of dislocations and grain boundaries, here probably due to C-Mn dipoles. Any parameter change which facilitates C-Mn formation affects the {111} texture development adversely. In cases where the recovery is not suppressed by C-Mn dipoles, a strong {111}〈112〉 component forms by oriented nucleation-selective growth thus causing a strong {111} texture. In cases of strong pinning the orientation dependence of both processes disappears and a weak texture develops.