Abstract
This study focuses on the effect of tungsten as a Laves phase forming element on the steam oxidation behavior of the Fe-9Cr alloy. Steam oxidation tests of the Fe-9Cr alloys with different tungsten concentrations were conducted in an Ar-15%H2O gas mixture at 923 K for up to 345.6 ks. The results showed that tungsten addition significantly improved the oxidation resistance of the Fe-9Cr alloy. By forming FeWO4 in the internal oxidation zone (IOZ) during oxidation, the oxygen partial pressure in this zone corresponded to Fe(W)/Fe2W/FeWO4 equilibrium, which is slightly lower than the Fe/FeO equilibrium. Therefore, the matrix of the IOZ was not being oxidized to form the inner scale, resulting in an improvement in oxidation resistance. A finer and higher fraction of the Fe2W phase produced by rapid cooling provided better Cr enrichment and improved the oxidation resistance of the alloys.
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Acknowledgements
This study was financially supported in part by JSPS KAKENHI Grant Number JP19K05055. The authors also thank the Open Facility Center, Materials Analysis Division, Tokyo Institute of Technology for conducting the XRF measurements.
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Utami, L., Ueda, M. The Effect of Tungsten Addition to Fe-9Cr Alloy on Steam Oxidation Behavior at 923 K. Oxid Met 97, 341–358 (2022). https://doi.org/10.1007/s11085-021-10093-0
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DOI: https://doi.org/10.1007/s11085-021-10093-0