Abstract
Two nickel-based superalloys with and without minor Nb were prepared using double vacuum melting. The comparison of microstructure, isothermal-oxidation, and hot corrosion behavior under molten Na2SO4/Na2SO4+25 wt% NaCl at 900°C was evaluated. Results indicated that Nb accelerated the formation of chromia scale in a short transient stage, leading to a lower scaling rate. Nb also inhibited the internal oxidation/nitridation. Both significantly improved the hot corrosion resistance under Na2SO4. However, the beneficial effect of Nb is slight under mixed salts with NaCl. The beneficial effects of Nb on oxidation and hot corrosion are discussed in detail.
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