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Taosha Liang,Lei Wang,Yang Liu,Xiu Song 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.3
The microstructure and mechanical properties of the laser welded joint of DZ125L and IN718 nickel base superalloys wereinvestigated. The results show that the fusion zone (FZ) mainly consists of fi ne dendrite structure with fi ne γ′, Laves phasesand MC carbides inhomogeneously distributed. The high welding temperature induces the partial dissolution of γ′ in theheat-aff ected zone (HAZ) of DZ125L and liquation of grain boundaries in both of the HAZs. After post-weld heat treatment(PWHT), fi ne γ″ and γ′ phases precipitate in the FZ, IN718 HAZ and IN718 base metal (BM), and fi ne γ′ precipitate in theγ channel of the HAZ and BM of DZ125L. With tensile testing, the joints after PWHT show higher strengths than that ofthe weaker DZ125L alloy. Plastic deformation mainly concentrates in the weaker DZ125L and the joint fi nally fails in theDZ125L BM.