Abstract
The passivation and corrosion behaviors of additive manufacturing repaired Ni-based single crystal superalloy were analyzed by comparison with the substrate. We found that the cladding layer is comprised of fine cellular dendrites (FDs) and fine cellular interdendritic zones (FIDZs) with abundant nano particles of γ′(Ni3Al) phase. The cladding layer possesses thicker passive film which gives better protection to the cladded component. The FIDZs are more sensitive to corrosion because of the dissolution of Nb-rich and Cr-Mo depleted zones in FIDZs. The γ/γ′ couples in the substrate tend to form mesh-like corrosion morphologies due to the selective dissolution of γ′ phases.
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