Effect of Hydrogen on the Development of Deformation and Fracture in Titanium Alloy VT22 in the Temperature Range of 293–823 K

Abstract

The development of deformation and fracture in titanium alloy VT22 in the temperature range of 293–823 K is studied in the presence of ~0.1 wt.% hydrogen. It has been shown that the formation of the structure consisting of β-transformed grains with thin lamellar structure and particles of the primary α-phase increases the resistance of the hydrogenated VT22 alloy to localized plastic deformation at the macrolevel and promotes the transition of the alloy fracture from brittle-ductile to ductile during tension at room temperature. At elevated temperatures (653–823 K), the presence of dissolved hydrogen in the solid solution in the VT22 alloy reduces its resistance to localized plastic deformation at the macrolevel and the deformation value to failure.