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Open AccessArticle

The Effect of Heat Treatment on the Oxidation Resistance of Cobalt-Based Superalloys

Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB30FS, UK
Department of Materials Science and Engineering, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, UK
Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Author to whom correspondence should be addressed.
Metals 2020, 10(2), 248;
Received: 5 January 2020 / Revised: 4 February 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
Degradation of the mechanical integrity of cobalt-based superalloys can occur as the carbide network is progressively oxidised during high temperature service. In this study, a heat-treatment aimed at redistributing the carbides was tested on two similar commercial Co-based superalloys, one with high C content (Co-101) and one with low C content (Stellite-21), to determine its influence on oxidation resistance. It was found that the carbide phases in the lower C-containing alloy could be solutioned more readily than the higher C-containing alloy, enabling the continuity of the carbide network to be reduced. This resulted in a reduced attack of the carbides down the interdendritic channels during oxidation testing, but increased thickness of the oxide overscale.
Keywords: cobalt-based superalloys; heat treatment; oxidation cobalt-based superalloys; heat treatment; oxidation
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MDPI and ACS Style

Moffat, J.P.; Whitfield, T.E.; Christofidou, K.A.; Pickering, E.J.; Jones, N.G.; Stone, H.J. The Effect of Heat Treatment on the Oxidation Resistance of Cobalt-Based Superalloys. Metals 2020, 10, 248.

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