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- Title
Effect of SO Addition on Air Oxidation Behavior of CM247 and CMSX-4 at 1050°C.
- Authors
Jalowicka, A.; Nowak, W.; Naumenko, D.; Quadakkers, W.
- 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.% SO at 1050°C has been studied. The corrosion reactions in the presence of SO 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 SO 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% SO.
- Subjects
OXIDATION; CHROMIUM-cobalt-nickel-molybdenum alloys; IGNEOUS intrusions; GAS turbines; EMISSION spectroscopy
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2016, Vol 68, Issue 11, p2776
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-016-2072-1