Deformation history and the resultant microstructure and texture in backward tube spinning of Ti–6Al–2Zr–1Mo–1V

Abstract

The correlations of microstructure and texture with deformation history in backward tube spinning were studied. Deformation history was calculated with initial and some intermediate configurations as reference configuration from FEM analysis. Microstructure and texture were investigated in the experimental workpiece of Ti–6Al–2Zr–1Mo–1V. The results show an obvious through-thickness inhomogeneity in deformation, microstructure and texture. Large material rotation occurs and plenty of grains are kinked and distorted in the outer layer, especially when thick-wall billet is spun. Deformation difference diminishes with wall thickness decreasing. The inhomogeneity of as-spun microstructure is reduced obviously in multi-pass and large deformation (for example, 85% total reduction) tube spinning. {0 0 0 2} texture develops generally without orthotropic symmetry. Textures in the outer and inner layers evolve differently because of inhomogeneous deformation histories.