Structure and mechanical property of TC17 linear friction welding joint

TC17 titanium alloy which usually used on the fan and compressor disk were selected. Microstructure and mechanical property of joint were investigated. Microstructure character of different part of joint was analyzed also. Results showed that the joints included three zones, base metal (BM), thermal mechanical affected zone (TMAZ) and weld zone (WZ). The microstructure of joint middle part was equiaxial grains, but the bottom part was the elongated grains. Dynamic recrystallation happened at the weld zone. Tensile test result showed that joint tensile strength equal to that of the TC17 base metal. The average hardness value of the HAZ was 486 HV which was higher than that in the BM and WZ.