1 Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China 2 School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111003, Liaoning, China
TC4 titanium alloy bulk specimens were prepared by laser deposition manufacturing.The effect of annealing treatment on mechanical properties, microstructure of LDMed TC4 titanium alloy was studied by optical microstructure (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD).The experimental results show that the microstructure is basketweave structure after α+β two-phase region annealing treatment and is transformed to Widmanstatten structure after β phase region annealing treatment.The mechanical properties still show significant anisotropy after annealing:Z-direction samples exhibit low strength and high plasticity, while XY-direction samples show high strength and low plasticity.The samples have a greatly decrease in strength and plasticity after β phase region annealing treatment.The annealing temperature has obvious influence on the anisotropy of the samples. The tensile properties of XY-direction samples are evidently scattered.Both direction samples exhibit ductile fracture after α+β two-phase region annealing treatment. The strength and plasticity of the samples decrease greatly after β single phase region annealing treatment, and the XY-direction samples are brittle fracture.
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