Effect of hydrogen on tensile and creep behavior of Ti-55511 alloy with different structure

A comparative study of hydrogen absorption on tensile and creep behavior of near-β titanium alloy Ti-5Al-5V-5Mo-1Cr-1Fe (Ti-55511) with fine- and coarse-grained structures was carried out. The formation of fine-grained structure by radial-shear rolling with subsequent aging results in increase of tensile strength of the alloy at room and elevated temperatures as well as creep resistance at 743 K in compare with coarse-grained one. Hydrogenation to 0.1 wt.% leads to an increase in strength and a decrease in ductility of both states of Ti-55511 alloy under tension at room and elevated temperatures. When there is dissolved hydrogen present under creep, the strain rate of steady-state creep increases, and the alloy's time and deformation to failure decrease in both states.