Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 765, Issue -, Pages 1148-1157Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.275
Keywords
Cobalt-nickel-base superalloy; SEM; Interfaces; Oxidation
Categories
Funding
- Science Fund for Distinguished Young Scholars of Hunan Province, China [2016JJ1016]
- project of Innovation and Entrepreneur Team Introduced by Guangdong Province, China [201301G0105337290]
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Oxidation behavior of a novel cobalt-nickel-base superalloy in air from 600 to 900 degrees Cis investigated in details. The results indicate a two-layer oxide film formed on the surface after oxidation: the external layer of oxide film is mainly composed of Cr2O3 and a few of other oxides, and the inner layer dominantly contains Al2O3. During oxidation at higher temperature and long duration, evaporation of Mo-containing oxide leads to void formation and local failure in external oxide layer, characterized by roughening of oxide film. A formation mechanism of oxide film on this alloy during oxidation is proposed for the first time. (C) 2018 Elsevier B.V. All rights reserved.
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