Abstract
Oxidation behavior and its effect on tensile properties of a powder metallurgy EP962NP superalloy have been investigated. Results show that the oxidation resistance of studied alloy has been improved by hot isostatic pressing as compared to the as-cast one. Oxidation process of the alloy powder metallurgy EP962NP is limited by diffusion of Cr3+ due to oxidation activation energy of 244.1 kJ·mol−1. In addition, the main reason for cracking and spalling during steady-state oxidation can be inferred as the rapid increase in growth stress caused by spinel. Interestingly, the tensile samples oxidized at 900 °C exhibit improved plasticity due to the refinement of γ′ caused by octet splitting.
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