Abstract:In this paper, the microstructure and mechanical properties of integral bladed titanium alloy Ti60 repaired by laser were studied. The results showed that the heat affected zone structure presents the transition characteristics from the Dual structure of the matrix area to the mesh basket structure of the repair area, and its average width is about 900 μm. The repair zone is mainly composed of columnar crystals growing epitaxially through multiple sedimentary layers, and the columnar crystals are uniformly distributed α phase mesh basket structures. Ti3(Sn, Al) facet facies of similar size were dispersed in the structure of the three regions, but their morphology and regional content varied significantly due to the solidification speed of the preparation process. The three areas are equally hard. The fracture characteristics of tensile specimens show that the fracture mechanism of laser additive repaired Ti60 titanium alloy is mixed fracture. The average tensile strength and yield strength are 992.4 MPa and 916.6 MPa respectively, which are superior to the strength standard of Ti60 titanium alloy forgings, the average elongation and section shrinkage after fracture are 8.5% and 14.6% , which are similar to the standard of Ti60 titanium alloy forgings and meets the requirements of practical engineering application