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- Title
Size Effects on Dissolution Kinetics of Y-Enriched Precipitates in FeCrAlY Alloys During High-Temperature Oxidation.
- Authors
Li, Jian; Cao, Guang-Ming; Cui, Chun-Yuan; Wang, Hao; Li, Cheng-Gang; Liu, Zhen-Yu
- Abstract
Our previous work demonstrated that the size of Y-enriched precipitates in FeCrAlY alloys have significant effects on their oxidation resistance. In the present work, the precipitate dissolution kinetics during isothermal oxidation at 1200 °C was studied. During oxidation, an almost uniform precipitate-free zone (PFZ) beneath the substrate/scale interface was formed due to the dissolution and transportation of Y from intermetallic precipitates. It was observed that after the Y in alloy was completely depleted, Y-rich oxides in the scale could attain the maximum size, and after this point, the average oxidation kinetics decreased. Based on the Y flux balance between precipitate dissolution and consumption in the PFZ, the modeling of precipitate dissolution kinetics with oxidation time was established, and the size effect of precipitates was taken into accounts. The PFZ depth in the sample with small precipitates was calculated to be greater than that in the sample with large precipitates throughout the oxidation test. By using this model, the transitional times of oxidation kinetics for the samples with different precipitate sizes were accurately predicted.
- Subjects
OXIDATION kinetics; ALLOYS
- Publication
Metallurgical & Materials Transactions. Part B, 2022, Vol 53, Issue 1, p627
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-021-02407-z