Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 68, Issue -, Pages 91-102Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.08.013
Keywords
Alumina-forming austenitic steel; High-temperature oxidation; Cold rolling; Oxidation mechanism
Funding
- National Natural Science Foundation of China
- Shanghai Baosteel Group Company [U1960204]
- National Natural Science Foundation of China [51871042, 51501034]
- Fundamental Research Funds for the Central Universities [N2023026]
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The oxidation behavior and mechanism of as-received and 30% cold-rolled alumina-forming austenitic steel were studied. Both types of steel demonstrated improved high-temperature oxidation resistance due to the formation of dense Al2O3 oxide scale. Gradual spallation of outer scale led to the formation of continuous and dense alumina scale.
The oxidation behavior and mechanism of as-received and 30 % cold-rolled alumina-forming austenitic (AFA) steel were investigated in dry air at 700 degrees C. The results show that the mass gain per unit area curves of as-received and 30 % cold-rolled steels subject to near-parabolic law before 100 h oxidation time. Two samples both show higher high-temperature oxidation resistance due to the formation of dense Al2O3 oxide scale. Gradual spallation of outer scale results in the formation of continuous and dense alumina scale. Dislocations can act as short-circuit diffusion channel for the diffusion of Al from alloy matrix to surface, and also provide nucleation sites for B2-NiAl phase, which ensure the continuous formation of Al2O3 scale. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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