Abstract
The oxidation behavior of three commercial Fe–Cr–Al alloys, Kanthal APM, Kanthal A1, and Kanthal AF (containing alloying additions of yttrium), has been investigated during isothermal exposures in air at 1173 K. After an initial transient stage, a diffusional process appears to predominantly control the oxidation kinetics of both alloys. During the transient stage, relatively important mass gains have been registered and the presence of yttrium does not seem to have a significant effect on the oxidation rate. On the contrary, the reactive element markedly influences the parabolic oxidation rate and the composition of the oxide scale. In situ X-ray diffraction (XRD) shows that yttrium promotes the transformation of transition alumina into α-Al2O3, leading to the formation of a more protective oxide scale.
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Cueff, R., Buscail, H., Caudron, E. et al. Influence of Yttrium-Alloying Addition on the Oxidation of Alumina Formers at 1173 K. Oxidation of Metals 58, 439–455 (2002). https://doi.org/10.1023/A:1020511304401
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DOI: https://doi.org/10.1023/A:1020511304401