Abstract
The hot corrosion behavior of the nickel-based single crystal superalloy IC21 under different atmosphere conditions is investigated. Compared with the conventional hot corrosion, it can be concluded that the flow atmosphere can significantly reduce the hot corrosion resistance of the superalloy. The mechanism leading to this phenomenon is that the refractory metal oxides (MoO3) produced by the hot corrosion of the superalloy accelerate the fluxing process of the main oxides (NiO). At the same time, the flowing atmosphere aggravates the direct reaction between molten salt and matrix under low oxygen conditions.
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