Precipitation Behaviors in the Diffusion Affected Zone of TLP Bonded Single Crystal Superalloy Joint

doi:10.1016/j.jmst.2014.11.008

Abstract

Abstract: The single crystal superalloys were joined by transient liquid phase (TLP) bonding. The precipitating behavior in the diffusion affected zone (DAZ) was studied and the hardness across the DAZ was analyzed. Results have shown that there existed M₃B₂, M₅B₃ and M₂₃B₆ borides in the DAZ. With increasing bonding time, fine M₃B₂ precipitates formed first near the isothermal solidification zone (ISZ)/matrix interface. Then, the dendritic M₅B₃ precipitates formed with an obvious orientation relationship with the substrate. The acicular precipitates were constituted by M₂₃B₆ and M₅B₃ phases with continuous or discontinuous morphologies. The hardness of the DAZ reached a summit in the fine M₃B₂ region and decreased with the increase of the distance away from the ISZ/matrix interface.

Key words: Single crystal superalloy, Transient liquid phase bonding (TLP), Microstructure, Micro-hardness

Naicheng Sheng, Jide Liu, Tao Jin, Xiaofeng Sun, Zhuangqi Hu. Precipitation Behaviors in the Diffusion Affected Zone of TLP Bonded Single Crystal Superalloy Joint[J]. J. Mater. Sci. Technol., 2015, 31(2): 129-134.

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