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The influence of yttrium addition on high-temperature performance of stress rupture property and oxidation resistance in Inconel 713C has been investigated. High-temperature stress rupture property and oxidation resistance property of Inconel 713C were dramatically improved with increasing yttrium addition content up to 0·02%yttrium, then decreased in excess of yttrium. Especially, the carbide morphology changed to discrete blocky shapes by causing improved high-temperature properties. Intermetallic compounds by excess yttrium addition made a poor stress rupture life. The high-temperature oxidation resistance of 0·02 wt-% yttrium added Inconel 713C improved more than no added yttrium Inconel 713C.

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