Abstract: In this paper, the linear friction welding test of TC17 titanium alloy, a common material of integral blade disc of aeroengine, was conducted. The microstructure morphology and mechanical properties of joints under different heat treatment conditions were analyzed by OM, SEM, microhardness and tensile test at room temperature. It is found that due to the complex thermal coupling effect in the welding process, the typical microstructure of the welding seam area, the thermal engine influence area and the thermal influence area are formed, and the welding joint perfor-mance is significantly reduced. After heat treatment after welding, thanks to the decomposition of the metastable β phase and the metastable α phase, the diffusely distributed needle-α phase was separated out, which greatly improved the joint performance. Moreover, the diffusely distributed needle-beam strengthening effect is closely related to the heat treatment temperature. The reasonable match between the strength and plasti-city of TC17 linear friction welded joint can be achieved through a reasonable heat treatment system, thus improving the joint’s comprehensive performance.
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