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.
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This work was financial supported by State Key Laboratory for Mechanical Behavior of Materials (No. 20141613) and the National Science Foundation of China (No. 51301131)
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Yan, J., Gao, Y., Gu, Y. et al. Role of Grain Boundaries on the Cyclic Steam Oxidation Behaviour of 18-8 Austenitic Stainless Steel. Oxid Met 85, 409–424 (2016). https://doi.org/10.1007/s11085-015-9603-y
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DOI: https://doi.org/10.1007/s11085-015-9603-y