Abstract
The hot corrosion behaviors of new-type Ni–Cr-based superalloys were investigated at elevated temperature. The effect of Nb or/and Y on hot corrosion resistance was investigated by corrosion kinetics. Surface morphology of the corrosion products was observed by SEM and the phase constituents were analyzed by XRD. Results showed that the corrosion scales of the Ni–Cr-based alloys consisted of Cr2O3, Al2O3, TiO2, and NiCr2O4. NiO was only detected in the alloy without Nb and Y. With the addition of Nb or/and Y, the hot corrosion resistance of the alloy was notably improved. The action mechanisms of Nb and Y were discussed in this study.
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