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

Published version
Peer-reviewed

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Authors

Moffat 
Whitfield 
Christofidou 
Pickering 
Jones 

Abstract

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.

Description

Keywords

cobalt-based superalloys, heat treatment, oxidation

Journal Title

Metals

Conference Name

Journal ISSN

2075-4701

Volume Title

10

Publisher

MDPI