Evolution of hot rolling and phase transformation textures in an α″ (orthorhombic) phase in Ti-Nb alloys

Abstract

This work describes the development of texture during hot rolling of two alloys namely, Ti-12Nb and Ti-16Nb. The alloys have been unidirectionally hot rolled to 80 % reductions at 800°C and air cooled. Both the alloys show the presence of α″ (orthorhombic) and small volume fraction of β (bcc) phases in hot rolled condition. The alloy Ti-12Nb exhibit moderate intensity texture while the alloy Ti-16Nb displays quite strong texture. The high overall intensity of texture in alloy Ti-16Nb in 80 % HR specimen can be attributed to the presence of large volume fraction of β phase in comparison to that of the alloy Ti-12Nb. This has been extended to study the textural changes after β solution treatment. This heat treatment consists of two types of phase transformations that are α″ → β → α″ and α″ → β → α after water quenching and furnace cooling from β phase field. © (2012) Trans Tech Publications, Switzerland.