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 inHigh temperature corrosion of materials Vol. 101; no. 2; pp. 211 - 223
Main Authors Xie, Yun, Du, Lingxiao, Liang, Juanjuan, Li, Longfei
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.04.2024
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