Influences of Annealing Treatment on Microstructure and Mechanical Properties of TC18 Titanium Alloy Electron Beam Welded Joint

Firstly, normal annealing and stress relief annealing were carried out on electron beam welded joint of TC18 titanium alloys, and then the effects of annealing treatments on microstructure, tensile and impact properties of the welded joint were studied; the properties of the welded joint were compared with that of the base metal. It is shown that, compared with the stress relief annealing, the content of α phase in the normal annealed joint decreased significantly while the content of β phase increased dramatically. Compared with the stress relief annealing, the strength of the joint adopting normal annealing was lower, while its plasticity was higher. After normal and stress relief annealing treatments, the tensile properties of base metal and welded joint were similar, but the impact property of base metal was better than that of the welded joint.