Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 564, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2022.153696
Keywords
ATF claddings; Nuclear-grade FeCrAl; High-temperature steam oxidation; Oxidation kinetics
Funding
- HGF nuclear safety program NUSAFE at KIT of Germany
- Korea Nuclear International Cooperation Foundation (KONICOF) - Ministry of Science and ICT
- MOTIE/KETEP project of the republic of Korea [20171510101990]
Ask authors/readers for more resources
The oxidation mechanism and kinetics of two nuclear-grade FeCrAl alloys were studied in high-temperature steam. The formation kinetics of slow alpha-alumina matched well in the temperature range of 1000°C to 1300°C. Below 1000°C, transient alumina formation resulted in faster kinetics. Excessive Fe-rich oxide formation was observed on the inner surface at 600°C due to surface roughness. Convoluted alpha-alumina was easily spalled at temperatures above 1300°C, causing faster oxidation kinetics. The spallation of oxide led to Cr and Al depletion and catastrophic oxidation above 1400°C, forming Fe-rich oxide with a liquid phase that significantly changed the tube segment geometry.
The oxidation mechanism and kinetics of two nuclear-grade FeCrAl alloys were investigated in steam up to 1500 degrees C by transient and isothermal oxidation tests. The slow alpha-alumina formation kinetics well matched only for the temperature range from 1000 degrees C to 1300 degrees C. Below 1000 degrees C, formation of transient alumina caused faster kinetics. In addition, an excessive Fe-rich oxide formation was observed on the inner surface due to rough surface at 600 degrees C. Above 1300 degrees C, convoluted alpha-alumina was easily spalled and caused faster kinetics. Moreover, the oxide spallation caused Cr and Al depletion and catastrophic oxidation above 1400 degrees C by the formation of Fe-rich oxide. The catastrophic oxidation caused a liquid phase in Fe-rich oxides, which significantly changed the tube segment geometry. (C) 2022 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available