Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 516, Issue -, Pages 317-326Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2019.01.041
Keywords
ODS; High-temperature oxidation; Alumina scale; Reactive elements
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Effects of Zr and excessive oxygen addition on the oxidation behavior of FeCrAl-ODS alloys are evaluated by high-temperature air and steam oxidation tests together with analyses using the thermochemical multiphase computer software FactSage. Zr addition to improve the strength of FeCrAl-ODS alloys increases the oxidation rate, but the oxidation rate can be reduced by increasing the excessive oxygen content to the appropriate level. From thermochemical multiphase calculations, Zr activity becomes lower in the alloy matrix with increasing excessive oxygen, and preventing ZrO2 formation within the alumina scale can decelerate oxygen inward diffusion through ZrO2 . Addition of Zr and excessive oxygen can also improve adhesion of the alumina scale at 1400 degrees C. Once the protective alumina scale is lost during oxidation at 1500 degrees C, Fe-O direct reaction with exothermic heat takes place and an oxidation reaction with partial melting rapidly proceeds within 30 min. (C) 2019 Elsevier B.V. All rights reserved.
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