Abstract
Electron beam welding combined with temperature field simulation has been carried out on the Ti70 titanium alloy, and the microstructural evolution and mechanical property of welded joint are systematically investigated. Results show that the simulated molten pool is well consistent with the experimental weld morphology. Microstructure analysis demonstrates that the upper part of fusion zone (FZ) consists of columnar crystals. The middle part of FZ is composed of equiaxed grains and β columnar crystals, and the fine martensite α′ presents the interlaced distribution within grains. The heat-affected zone is composed of transformed phase β structure (βt), martensite α′ and residual α phase. The microhardness in FZ is the highest. The maximum tensile strength of welded joint reaches 754.5 MPa, which is close to that of base metal. There are many equiaxed dimples on the joint fracture surface, and it dominantly presents the characteristic of ductile fracture.
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