High Temperature Oxidation Behavior of a Novel γ′-Strengthened CoNi-Base Superalloy

The high-temperature oxidation behavior of a novel γ′-strengthened CoNi-base superalloy was investigated by isothermal oxidation in air at 700 °C and 900 °C. The results show that the superalloy formed a multilayered oxide scale at the two temperatures, exhibiting parabolic oxidation kinetics. Theor...

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Bibliographic Details
Published in:High temperature corrosion of materials 2024-04, Vol.101 (2), p.211-223
Main Authors: Xie, Yun, Du, Lingxiao, Liang, Juanjuan, Li, Longfei
Format: Article
Language:English
Subjects:
Aluminum oxide
High temperature
Oxidation
Reaction kinetics
Scale (corrosion)
Scale formation
Superalloys
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Summary:The high-temperature oxidation behavior of a novel γ′-strengthened CoNi-base superalloy was investigated by isothermal oxidation in air at 700 °C and 900 °C. The results show that the superalloy formed a multilayered oxide scale at the two temperatures, exhibiting parabolic oxidation kinetics. Theoretical calculations suggest that the alloy Al content was insufficient to form a protective alumina scale and elevating temperature was beneficial for reducing the critical Al concentrations required for alumina scale formation. In agreement with the predications, a discontinuous alumina band was developed at the oxidation front as the temperature was increased from 700 to 900 °C.
ISSN:2731-8397
0030-770X
2731-8400
1573-4889
DOI:10.1007/s11085-023-10214-x