Influence of Heating Temperature of Hot Rolling on In-Plane Anisotropy of Ti-4. 5Al-2Mo-1. 6V-0. 5Fe-0. 3Si-0. 03C

Ti-4. 5A1-2Mo-1. 6V-0. 5Fe-0. 3Si-0. 03C (KS Ti-9, registered as ASTM Gr. 35) has been developed as a coilable high strength a-13 type titanium alloy and as substitute for Ti-6Al-4V in sheet product. However, alpha-beta type alloys show strong in-plane anisotropies when manufactured by a uni-directional rolling process. In order to reduce in-plane anisotropies of KS Ti-9 coil sheet produced by a uni-directional rolling process, we have adopted the 13 rolling process, defined as the process of rolling after heating a slab over beta transus. This new process results in forming a weaker transverse-texture than that obtained by the conventional process, alpha +beta rolling process, and decreasing in-plane anisotropies. Trial sheet manufactured by the new process on a mass production line also exhibits less in-plane anisotropies and has the same properties as Ti-6Al-4V (AMS 4911L).