Abstract
The morphology of γ′(Ni3Al) phase is essential for the performance of laser additive manufacturing repaired Ni-based single crystal superalloy, thereby, it is of crucial significance to manipulate γ′ phase in order to optimize the corrosion performance of laser cladded component. In this research, the morphology of γ′ phase is tuned via different heat treatments. The microstructure and corrosion behaviors of laser repaired superalloy are analyzed by electron microscopy and electrochemical measurements. It is found that the electrochemical corrosion resistance of as-deposited part is superior than that of the substrate, and the dominant morphology of γ′ phase changes from spherical shape to cuboidal shape and to rafted morphology with increasing heat treatment temperature. The corrosion resistance peaks at 1050 °C, attributing to the combined effects of decreased volume fraction of γ′ phase and favored distribution of Cr, W, and Al. Our results offer a practical means for the post-repair heat treatment of single crystal turbine blades.
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