Microstructure and Mechanical Properties of Laser Additive Repaired Ti60 Titanium Alloy
The microstructure and mechanical properties of integral bladed titanium alloy Ti60 repaired by laser were studied.The results show 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 by α phase mesh basket structures.Ti3(Sn,Al)facet facies of similar size are dispersed in the structure of the three regions,but their morphology and regional content vary 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 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％,respectively,which are similar to the standard of Ti60 titanium alloy forgings and which meet the requirements of practical engineering application
NETL
NSTL
万方数据
