Increasing the intensity of {111}<hkl> by thermomechanical treatments

Abstract

Since it is well accepted that the {111}<hkl> recrystallization texture component originates in the ? fibre, a series of experiments to maximize this component have been undertaken. The total cold rolling was fixed at 80% and was done in two parts interrupted by an intermediate anneal. This intermediate anneal was designed to give 100% recrystallization, followed by the remaining cold rolling to a total of 80% reduction. Clearly given the procedure, low initial reductions gave very large grain sizes at full annealing, whether this rolling occurred first or second. However significant improvement was obtained for a certain combination of this double rolling procedure. A second experiment was performed in which IF steel was warm rolled at 700° C in a single pass to 75% reduction. This was then cold rolled 80% and given a final recrystallization treatment. The resulting texture was an extremely intense {111} fibre of 30 - 40x Random. OIM revealed that deformation banding in ? deformed material provided the lattice curvature for successful nucleation of {111}<hkl> in the deformed ? fibre material.