Microstructure and Texture Evolution during β processing of Hypoeutectic Boron Modified Ti-6Al-4V Alloy

摘要

Hypoeutectic boron addition Ti-6Al-4V alloy produces a reduction in as-cast grain size by roughly an order of magnitude resulting in the possibility of avoiding ingot breakdown step and thereby tremendously reducing the processing cost. Ti-6A-4V alloy with boron addition show almost homogeneous microstructure from periphery towards the center of as-cast ingot. Above β-transus.the boron added material showed a fully beta worked structure with very fine prior β grains as well as acicular alpha colonies. Texture evolved during deformation was completely different in the two alloys,suggesting difference in the operating deformation mechanisms that produces the end stable orientations.Presence of boride particles influence the deformation as well as transformation texture in the same way as in case of hot working of as cast materials.