Stabilization treatment of titanium alloy VT9

Abstract

Systematic investigations of tensile properties of α+β type high temperature Ti alloy VT9 (Ti-6 Al-3.3 Mo-1.65 Zr-0.3 Si wt. per cent) developed on ageing at 803, 823 and 853 K for 2, 6 and 12 hr, respectively following the solution treatment in α+β phase field at 1233 K for 1 hr and air cooling, show that the highest tensile strength values are obtained on ageing at 823 K for 6 or 12 hr. In view of the shorter duration of ageing, the ageing treatment at 823 K for 6 hr is considered appropriate stabilization treatment for this alloy. The tensile strength values of the alloy VT9 from the newly-established stabilization treatment are considerably higher than those resulting from the earlier reported stabilization treatment (at 803 K for 6 hr), in particular at room temperature.