Abstract:In this experiment, the effects of different heat treatment regimes on the microstructure and mechanical properties of cold-rolled Ti90 alloy tubes with two deformations were studied through analysis methods such as metallography, room temperature tensile, low temperature impact, and SEM. The results show that the microstructure of the cold-rolled Ti90 alloy tube is basketweave microstructure, and the microstructure changes after annealing at 700℃~930℃, and a duplex microstructure is formed after annealing at 930℃. The heat treatment system has a greater impact for the structure of the tube, and the rolling deformation only has a certain impact on the grain size of the tube. With the increase of the annealing temperature, the room temperature strength and -10℃ low temperature impact toughness of the Ti90 rolled tube first decrease and then increase, and the change with temperature of elongation is not obvious. The tube reaches the highest value of strength, plasticity, and toughness at 930℃. The impact fracture of the tube is composed of small equiaxed dimples and tearing dimples, with tearing edges existing, which showing ductile fracture.