Ti-6Al-4V alloy was treated at 5 GPa pressure and 1,000 °C for 20 minutes, the room temperature creep deformation of the alloy before and after 5 GPa pressure treatment was measured. According to the microstructure analysis, the effect of high pressure heat treatment on room temperature creep property of Ti-6Al-4Valloy was investigated. The results show that room temperature creep in Ti-6Al-4V alloy before and after 5 GPa pressure treatment can occur, 5 GPa pressure treatment can reduce room temperature creep deformation, and leads to the creep resistance of Ti-6Al-4V alloy rises.

Abstract:The effect of heating temperature and thermal-cold recycle times on microstructure and hardness of a W-Cr-Mn-Mo-V Ferro-based hardfacing layer was studied. The results show the surfacing layer has good high-temperature stability and ability to resist quench heat and heat softening. After thermal-cold recycle at 560 °C 18 °C for 120 times, the hardness of the hardfacing layer is HRC 57.5, its microstructure is mainly tempered martensite and a small amount of retained austenite, when thermal-cold recycled at 680 °C 18 °C for 120 times, the hardness of the hardfacing layer is HRC 44.5, martensite in the hardfacing layer has almost decomposed.