Abstract
Three oxide features: the thin and smooth protective oxide, reactive element (Ti-, Zr- or Y-rich) particles, and patches of thick oxide surrounding the Y-rich reactive element particles, were observed on a commercial FeCrAlRE alloy, Kanthal AF, exposed at 900 °C. The microstructural development of the patches of thick oxide was investigated on samples exposed for 24 or 168 h in either dry O2 or O2 + 40% H2O. Analytical transmission electron microscopy in combination with site-precision TEM sample preparation by FIB/SEM was used. In all patches a thin but continuous inward growing α-Al2O3 layer was formed under a thick outward growing alumina layer, which initially consisted only of γ-Al2O3. In dry O2, transformation of γ-Al2O3 (in the outer layer) to α-Al2O3 had started during 24 h and a considerable amount of γ-Al2O3 had transformed after 168 h. The transformation originated immediately above the inward growing α-Al2O3. No such transformation occurred in O2 + H2O. The possible effects of the Y-rich RE particles, as well as the effects of water vapour, on the oxidation were discussed.
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Acknowledgements
The authors are grateful to Bo Jönsson at Kanthal AB for discussions and advice throughout this work. This work was carried out within the Swedish High Temperature Corrosion Centre (HTC). It was supported by Kanthal AB and Sandvik Materials Technology AB and the National Graduate School in Materials Science at Chalmers University of Technology.
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Liu, F., Götlind, H., Svensson, JE. et al. TEM Investigation of the Microstructure of the Scale Formed on a FeCrAlRE Alloy at 900 °C: The Effect of Y-rich RE Particles. Oxid Met 74, 11–32 (2010). https://doi.org/10.1007/s11085-010-9195-5
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DOI: https://doi.org/10.1007/s11085-010-9195-5