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Study of the Cyclic Oxidation Resistance of Superalloy IN-625: Lifetime Predicted by COSP-Modelling Program

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Abstract

Cyclic-oxidation tests were performed on IN-625 in order to evaluate its oxidation resistance. IN-625 showed a strong cyclic-oxidation resistance at 900°C. At 1000°C, there was evaporation of chromium oxide leading to Cr depletion due to a reoxidation effect. Long-term exposure leads to microstructural modification; it seems to be detrimental. The chromia scale losses its protective properties and then IN-625 exhibits lower cyclic-oxidation resistance. The computer simulation by the COSP model, after 1000 cycles, predicts good cyclic -oxidation resistance of IN-625 at 900°C.

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Acknowledgements

The authors want to express their gratitude to Dr. J. Smialek from NASA for the COSP computer program.

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Correspondence to F. J. Pérez.

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N’dah, E., Hierro, M.P., Borrero, K. et al. Study of the Cyclic Oxidation Resistance of Superalloy IN-625: Lifetime Predicted by COSP-Modelling Program. Oxid Met 68, 9–21 (2007). https://doi.org/10.1007/s11085-006-9048-4

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  • DOI: https://doi.org/10.1007/s11085-006-9048-4

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