Effects of Heat Treatment Systems on Properties of Titanium Alloy Tube by Hydraulic Bulging

Ti-Al-V-In new-typed titanium alloy thin-walled tube samples by hydraulic bulging were heat treated with different heat treatment systems,and the mechanical properties and corrosion resistance of the tubes were tested and analyzed. The results show that compared with common annealing,both isothermal annealing and ultrasonic vibration isothermal annealing could improve the mechanical properties and corrosion resistance of the tube,while the improvement effect of ultrasonic vibration isothermal annealing is more significant with the tensile strength,yield strength and elongation respectively increased by 22%,32% and 18%,the corrosion potential shifted positively by 146 mV and the corrosion current density decreased by 71%.The optimized heat treatment system is ultrasonic vibration isothermal annealing,with the high temperature,low temperature and ultrasonic vibration frequency optimized at 820 ℃,540 ℃ and 35 Hz,respectively.