| || Stabilisation Treatment of Titanium Alloy VT9
Author : Ramachandra, C. ;Singh, V.;Singh, P.N.;Singh, B.K.
Source : Defence Science Journal ; Vol:49(2) ; 1999 ; pp 169-176
Subject : 620.1 Material Science and Technology
Keywords : Ageing treatment ;Tensile properties;Tensile strength values;Tensile strength
Abstract : "Systematic investigations of tensile properties of alpha + beeta type high temperature Ti alloy VT9 (Ti-6 Al-3.3 Mo-1.6~Zr-0.3 Si wt. per cent) developed on ageing at 803, 823 and 853 K for 2, 6 and 121 hr, respectively following the solution treatment in alpha + beeta 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 stabilisation treatment for this alloy. The tensile strength values of the alloy VT9 from the newly-established stabilisation treatment are considerably higher than those resulting from the earlier reported stabilisation treatment (at 803 K for 6 hr), in particular at room temperature."