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

1
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB30FS, UK
2
Department of Materials Science and Engineering, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, UK
3
Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Metals 2020, 10(2), 248; https://doi.org/10.3390/met10020248
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
  • Externally hosted supplementary file 1
    Doi: https://doi.org/10.17863/CAM.48711
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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