Effect of Cu/V multi-interlayer on the microstructure and mechanical properties of TC4/IN718 joint by laser welding
In order to realize the effective connection between TC4 and GH4169 alloy,the Cu/V multi-interlayer was applied to join TC4 and IN718 alloy by continuous laser welding.The regulating mechanism of the Cu/V multi-interlayer on the cracks,microstructure and mechanical properties of TC4/IN718 joint was analyzed.The results show that a large number of Ti-Ni brittle intermetallic compounds are generated in the weld area of TC4/IN718 joint with the conventional laser welding,resulting in the formation of a large number of longitudinal cracks in the joint.The microstructure structure of weld zone in the TC4/IN718 joint is comprised of Ti(s,s)+Ti2Ni+Ti-Cr+NiTi+Ni3Ti+Cr(s,s).When adopting the Cu/V multi-interlayer,the effective joining between TC4 and IN718 alloy is realized,the tensile strength of the joint reaches 271MP.The microstructure structure of weld zone in the TC4/Cu/V/IN718 joint is transformed into Ti(s,s)+V(s,s)+NiV3+Cr(s,s)+Cu(s,s)+unmelted copper.
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