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Oxidation kinetics of nuclear-grade FeCrAl alloys in steam in the temperature range 600-1500°C

Kim, C.; Tang, C.; Große, M.; Steinbrück, M. ORCID iD icon

Abstract (englisch):

Thin FeCrAl tubes are promising candidates for ATF cladding application. In this study, the high-temperature oxidation in steam of two nuclear-grade FeCrAl alloys developed by ORNL (B136Y3 and C26M2) was investigated over a wide temperature range. Transient oxidation tests from 500°C to 1250°C were conducted as well as isothermal experiments from 600°C to 1500°C. The well-accepted and in severe accident codes applied low oxidation kinetics determined by the formation of a protective α-alumina scale was confirmed only for the temperature range 1000-1250°C. At lower temperatures, the oxidation kinetics of both alloys followed rather the kinetics of transient alumina such as θ-alumina. At temperatures from approx. 1350°C, protective alumina formation failed resulting in much faster oxidation kinetics determined by the formation of iron oxides. This faster oxidation at low and high temperatures should be taken into account in codes for simulation of accident scenarios. Special effects of small open tube segments allowing oxidation of the inner surfaces and of thin wall thickness are discussed.

Preprint §
DOI: 10.5445/IR/1000141509
Veröffentlicht am 23.12.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Publikationsmonat/-jahr 10.2021
Sprache Englisch
Identifikator KITopen-ID: 1000141509
HGF-Programm 32.12.02 (POF IV, LK 01) Beyond Design Basis and Emergency Management
Erschienen in Proceedings of TOPFUEL 2021 Conference
Veranstaltung TopFuel (2021), Santander, Spanien, 24.10.2021 – 28.10.2021
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