Research on Effect of Secondary Solid Solution on the Remelting Layer of TC4 Titanium Alloy Laser Polishing Surface
The physicochemical property of remelting layer with an instability interface by laser polishing was different from the basis metal,which affected device operation and even threatened equipment safety due to the fracture and detach-ment of material interfaces at complex external environments.It has been becoming a key problem about how to reduce the remelting layer in the field of laser polishing.It was proposed that a new method based on secondary solid solution to reduce laser polishing remelting layer.The change of surface appearance,microstructure,micro-hardness,and wear-resisting property of titanium alloy before and after laser polishing were studied.The transformation of the microstructure of the remelting layer to the base metal was realized,the thickness of the remelting layer was reduced,and the micro-hardness and wear resistance were improved.The deep physical mechanism of secondary solid solution in the microstructure transforma-tion process of remelting layer was clarified.The 85％decrease of the surface roughness occurred from the original titanium alloy surface roughness Sa=1.62 μm to Sa=243 nm after laser polishing.However,the subsequent secondary solid so-lution did not change the surface roughness of laser polishing.
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