Effect of annealing temperature(650-900℃)on the microstructure and mechanical properties of TA15 titanium alloy prepared by laser selective melting(SLM)was studied.The results show that with the increase of annealing temperature,the acicular α'martensite in the SLMed TA15 titanium alloy gradually decomposes into α+β phases,the α phase gradually transforms from acicular to lamellar,and theβ phase is mainly precipitated in the α'martensite intergranular and where rich in intragranular lattice defects.The grain misorientation distribution of the TA15 specimen after annealing is very similar to that of the as-SLMed specimen,which has strong microstructural inheritance.With the increase of annealing temperature in the range of 650-800 ℃,the strength and hardness of the specimen decrease,while the elongation increases.When the annealing temperature is 900 ℃,the tensile strength and elongation of the specimen are 1117 MPa and 11.2％,respectively,showing the best comprehensive mechanical properties.
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