Microstructure and Deformation Behavior of Hydrogenated TC16 Titanium Alloy

TC16 titanium alloys with different hydrogen contents were obtained using a hydrogenating treatment. Effects of the hydrogen content on phase transformation temperatures of TC16 titanium alloys were investigated by a continuous heating method. Microstructures of hydrogenated TC16 titanium alloys were studied using OM, deformation behaviours were studied using quasi-static compression tests, and the deformation behaviours at high strain rates were investigated using magnetic cold heading. The results show that phase transformation temperature of TC16 titanium alloy decreases with the increasing of hydrogen content. When the hydrogen amount reaches 0.3 wt%, the phase transformation temperature decreases by about 150 degrees C. Microstructures of hydrogenated TC16 titanium alloy changes as well, martensite phase occurs for low hydrogen content, while equal-axial beta phase for high hydrogen quantity. Deformation velocity sensitivity of hydrogenated TC16 titanium alloy increases. With the increasing of deformation velocity, the formability is improved, the limit compression deformation is greater than 86% at a high strain rate. Layer board nuts with perfect surfaces are prepared by cold up-setting tests, and the deformation behaviour is validated.