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Effects of Yttrium on the Oxidation Behavior of Low Sulfur Content Fe–Cr–Al Alloys for Heat Resistant Wires

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Abstract

The melting of FeCrAl–Y alloy in an electric furnace allows for a very low sulfur content to be obtained, of around 5 ppm or less. So, the question of the necessary quantity of yttrium to add in this ferritic alloy to reach the application requirements is once again of interest. Laboratory heats of FeCrAl with yttrium additions from 0 to 1,510 ppm and ≤6 ppm of sulfur content were melted, processed and studied. Oxidation kinetics in dry air were measured, using thermogravimetric measurements. High resolution scanning electron micrographic examinations provided a good description of the alumina oxide scales. These investigations were completed with a quantification of secondary phases according to the yttrium content of each melt. The results were analyzed using the oxidation mechanisms in relation to the yttrium content. Finally, a moderate level of yttrium was defined to reach the longest lifetime during the cyclic oxidation test of the commercial Resistohm® Y grade.

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Acknowledgments

The authors are grateful to the staff of the Aperam Research Centre, involved in the study. First to Dr. S. Witzke, M. M. G. Colas and R. Gaudry for supplying the high-purity model alloys, to Mrs. N. Vieira for the technical monitoring of the study, associated to M. C. Lazerne for the realization of the oxidation tests. The work of Dr. P. L. Reydet and M. P. Guichard to develop a quantitative analysis method of second phase particles are gratefully acknowledged, as well as that of M. R. Vigneron for the quality of the micrographic examinations.

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Correspondence to Richard Bousquet.

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Bousquet, R., Fayeulle, D., Bruyere, E. et al. Effects of Yttrium on the Oxidation Behavior of Low Sulfur Content Fe–Cr–Al Alloys for Heat Resistant Wires. Oxid Met 80, 13–24 (2013). https://doi.org/10.1007/s11085-013-9403-1

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  • DOI: https://doi.org/10.1007/s11085-013-9403-1

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