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Effect of SO2 Addition on Air Oxidation Behavior of CM247 and CMSX-4 at 1050°C

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Abstract

In the present work, the oxidation behavior of two commercial Ni-base superalloys, CMSX-4 and CM247, in synthetic air with and without 2 vol.% SO2 at 1050°C has been studied. The corrosion reactions in the presence of SO2 could not be explained simply in terms of the contents of the main scale‐forming alloying elements, Cr and Al. The far better resistance of CMSX-4 is related to the formation of a rather pure and dense alumina scale after a very short period of transient oxidation. Rapid development of an alumina scale prevents access of molecular SO2 to the metal surface thus effectively suppressing internal sulfidation. In contrast, CM247 with a similar Al-content formed an Al-rich oxide scale with local intrusions and/or inhomogeneities caused by the underlying alloy microstructure, which deteriorated its resistance to internal sulfidation and resulted in rapid failure in synthetic air + 2% SO2.

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Acknowledgements

The authors are grateful to their colleagues of the Forschungszentrum Jülich GmbH for performing the experimental work: H. Lippert and Dr. V. Nischwitz (chemical analysis); R. Mahnke, H. Cosler, and A. Kick (oxidation experiments), V. Gutzeit and J. Bartsch (metallographic studies) and Dr. E. Wessel for SEM/EDX investigations. The German Research Foundation (DFG) is acknowledged for funding this work under Grant # NA 615 2‐1.

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Jalowicka, A., Nowak, W.J., Naumenko, D. et al. Effect of SO2 Addition on Air Oxidation Behavior of CM247 and CMSX-4 at 1050°C. JOM 68, 2776–2785 (2016). https://doi.org/10.1007/s11837-016-2072-1

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  • DOI: https://doi.org/10.1007/s11837-016-2072-1

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