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김정길(Jeong Kil Kim),박해지(Hae Ji Park),심덕남(Deog Nam Shim) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.3
Transient liquid phase (TLP) bonding is essential technology to repair micro-cracking on the airfoil of blades and vanes for gas turbines. Understanding of the characteristics of TLP bonding of the superalloys is necessary in the application of the technology for repairing these components. In this study, the focus was on investigating TLP bonding characteristics of γ′ precipitation strengthened Ni based superalloy. TLP bonding was carried out with an amorphous filler metal in various bonding conditions, and the microstructural characterization wasinvestigated through optical microscopy (OM) and electron probe micro-analysis (EPMA). The experimantal results explained clearly that bonding temperatures had critical effects on the TLP bonding behaviors, and that isothermal solidication of the joints made at higher temperatures than 1170 ℃ was controlled by Ti diffusion instead of B.