Abstract
The aluminum deoxidation equilibrium in molten Fe-36 mass pct Ni and Fe-46 mass pct Ni alloys was experimentally determined at 1773 K and 1873 K to obtain the thermodynamic parameters around the liquidus temperature, which is required to predict the deoxidation reaction for the ingot-casting process. Automatic SEM-EDS inclusion analysis was performed to estimate the undissolved oxygen content. Thermodynamic analysis on Al deoxidation was carried out using Miki and Hino’s formula, which is based on Darken’s quadratic formalism and the Redlich–Kister polynomial. From the composition dependence of the apparent equilibrium constant in Fe-Ni alloy, the necessity of the third-order interaction parameter of Ni-Al was found. Then, the interaction parameters of Fe-Al, Al-O and Ni-Al were evaluated.
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Acknowledgments
The authors thank Dr. J.P. Verhoeven and A. Potargent in Heraeus Electro-Nite, Ltd., for hel** with the oxygen analysis and Mr. T. Nonaka in Japan Steel Works, Ltd., for hel** with the SEM-EDS inclusion analysis.
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Manuscript submitted January 23, 2018.
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Fukaya, H., Kajikawa, K., Malfliet, A. et al. Aluminum Deoxidation Equilibrium of Fe-Ni Alloy at 1773 K and 1873 K. Metall Mater Trans B 49, 2389–2399 (2018). https://doi.org/10.1007/s11663-018-1336-2
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DOI: https://doi.org/10.1007/s11663-018-1336-2