Heat treatment method of TC18 titanium alloy

The invention relates to a heat treatment method of TC18 titanium alloy, and belongs to the technical field of materials. In the TC18 titanium alloy heat treatment, heat preservation is conducted for 1 h at the temperature ranging from T beta + 70 DEG C to T beta + 130 DEG C, and then water cooling is conducted to the room temperature; then the alloy is subjected to heat preservation for 6-8 h at the temperature of 550-600 DEG C, and water cooling is conducted to the room temperature; and finally, aging the alloy at 300-450 DEG C for 2-4 hours. According to the method, through solid solution and two-stage aging, the microstructure of the alloy can be effectively regulated and controlled by selecting the heat preservation temperature, the heat preservation time and the cooling mode, the microstructure with the equiaxial alpha phase, the strip-shaped alpha phase and a large number of fine needle-shaped alpha and beta phase matrixes matched is obtained, and the TC18 titanium alloy obtains higher strength and goo