Abstract：TA15 titanium alloy samples were prepared by selective laser melting (SLM) forming technology. The
effects of heat treatment on microstructure, tensile and impact properties of TA15 titanium alloy samples were stud‐
ied. The results show that under the single heat treatment mode, with the prolongation of holding time and the in‐
crease of annealing temperature, α' martensite in the microstructure gradually decomposes, and the volume fraction
of the secondary α phase and β phase gradually increases, and the tensile strength of the samples show a downward
trend, but the fracture toughness increases at first and decreases subsequently. Under the heat treatment system of
850 ℃ for 4 h, the sample has better comprehensive properties, its tensile strength is 1 033 MPa, and the impact en‐
ergy is 38 J. Under the double heat treatment mode, the microstructure is mainly a basket-weave structure α+β twophase structure, the degree of microstructure homogenization is higher, which shows that the dispersion of macro‐
scopic properties is smaller, with an average tensile strength of 1 029 MPa and impact energy of 40 J.
2024, Vol. 34 
