Abstract
High temperature oxidation behavior of a Nibase superalloy, PWA1480, developed for use as single crystal blades and vanes in advanced gas turbines has been assessed. Isothermal and cyclic oxidation tests up to 200 hours were conducted at 1323, 1410, and 1473 K. The alloy was evaluated as to sample weight change, type of scale formed, type and amount of spall, and microstructural changes. The oxidation attack was more severe in cyclic as compared with isothermal oxidation. Also, enormous growth of the γ’ precipitate was observed at 1423 K during cyclic oxidation.
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