INFLUENCE OF TRANSVERSE ROLLING ON THE MICROSTRUCTURAL AND TEXTURE DEVELOPMENT IN PURE TANTALUM

The influence of transverse rolling passes on the recrystallization texture was investigated in an effort to strengthen the {111} [uvw] type components and reduce the intensity of the {100} [0vw] components, improve the uniformity of the microstructure, and refine the grain size in high-purity tantalum plate. Tantalum, from three different ingot breakdown processes, received an additional 80 pct reduction in the transverse direction (perpendicular to the ingot centerline) in the processing schedule prior to final annealing. This work investigated the influence of the additional transverse rolling passes on the development of texture in the as-rolled tantalum and also in rolled plus annealed tantalum. After annealing, the tantalum plates had significantly strengthened {111} [uvw] crystallographic orientations, not only for the side forged process, but also for the upset and side forged tantalum. For tantalum processed by extrusion, the transverse rolling did not improve the final recrystallized texture.