1. The Effect of Tungsten Addition to Fe-9Cr Alloy on Steam Oxidation Behavior at 923 K.
- Author
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Utami, Lidyana and Ueda, Mitsutoshi
- Subjects
- *
LAVES phases (Metallurgy) , *OXIDATION , *ALLOYS , *PARTIAL pressure , *GAS mixtures , *TUNGSTEN , *TUNGSTEN bronze - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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