Abstract
This work investigated the oxidation behaviour of 18-8 austenitic stainless steel under cyclic steam oxidation condition. The results indicate that grain boundaries not only promote the chromium outward diffusion, but also provide the fast diffusion paths for the oxygen penetration. Thus, oxide inward growth occurs when the chromium content at scale-matrix interface cannot sustain the continuous chromia scale. In addition, the grain boundaries promote the Fe outward diffusion, accompanied with the fast growth of interfacial voids between two oxide layers. As a result, the oxide scale exfoliates once the voids grow to a critical value.
Original language | English |
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Pages (from-to) | 409-424 |
Number of pages | 16 |
Journal | Oxidation of Metals |
Volume | 85 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2016 Apr 1 |
Externally published | Yes |
Keywords
- Interface
- Oxide inward growth
- Scale spallation
- Thermal cycling
ASJC Scopus subject areas
- Inorganic Chemistry
- Metals and Alloys
- Materials Chemistry