A method for improving the performance of additive manufactured titanium alloy weld joints

Abstract

The application discloses a method for improving the performance of a welded joint of an additive manufacturing titanium alloy, and belongs to the technical field of welding. The method is aimed at the problem that coarse brittle structure is easily formed in the weld zone of the additive manufacturing titanium alloy, leading to the decrease of the plasticity of the joint. CoCrFeMnNi high-entropy alloy powder is synchronously sent into the molten pool in the laser welding process, the strong beta phase stabilization effect of the constituent elements of the high-entropy alloy powder is utilized to cooperatively control the solidification and phase change process of the weld, the composition supercooling degree is increased, the columnar crystal epitaxial growth is inhibited, and fine equiaxed crystal structure is formed. The method can significantly improve the elongation after fracture of the welded joint, while maintaining high strength, and is suitable for the welding splicing and in-service repair of the additive manufacturing titanium alloy component.

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