Effects of hydrogenation temperature on room-temperature compressive properties of CMHT-treated Ti6Al4V alloy

•Ultimate compression increased by 83.3 % after eleven times CMHT at 850 ℃.•Phase evolution was greatly affected by hydrogenation temperature and CMHT number.•Compressive properties were greatly affected by phase evolution after CMHT.•Hydrogen absorption rate decreased with the increase of hydrogenation temperature. Compression tests were performed at room temperature to investigate the effects of hydrogenation temperature on compressive properties of Ti6Al4V alloy treated by continuous multistep hydrogenation treatment (CMHT). Pressure-composition isotherms and microstructures were also studied. Results showed that the equilibrium hydrogen pressure increased, and the hydrogen absorption rate decreased with the increase of hydrogenation temperature. The amounts of β phase and α” martensite increased first and then decreased when Ti6Al4V alloy was treated by four times CMHT with the increase of hydrogenation temperature. Hydrogenation temperature played a different role on the compressive properties of CMHT-treated Ti6Al4V alloy. The ultimate compression of Ti6Al4V alloy treated by 11 times CMHT at 850 °C increased by 83.3 % as compared to the as-received Ti6Al4V alloy. The compressive properties of Ti6Al4V alloy were dependent on the amounts of different phases and microstructures when Ti6Al4V alloy was treated by CMHT at different temperatures.