Effect of water vapor on the oxide growth in FeCrAl-based oxide dispersion-strengthened fuel cladding material at 1100 ℃ and 1200 ℃. (October 2021)

• Record Type: Journal Article
• Authors: Li, Qing; Song, Peng; Li, Zhenhua; Long, Dijun; Sun, Yongduo; Huang, Taihong; Li, Chao; Lu, Jiansheng
• Is Part Of: Corrosion science. Volume 191(2021)
• Publication Date: 2021-10
• Subjects: accident-tolerant fuel -- Fe-13Cr-4.5Al-ODS alloy -- oxidation -- alumina -- TEM; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109775
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: As a potential accident-tolerant fuel cladding material, the high-temperature oxidation behavior of Fe-13Cr-4.5Al-oxide dispersion-strengthened alloy was investigated in dry air and moist air at 1100–1200 ℃. The specimens were examined using a combination of gravimetry and several surface-analytical techniques, including X-ray diffraction, scanning electron microscopy, electron probe microanalysis, focused ion beam, and transmission electron microscopy. The oxidation occurred rapidly at first and then slowed down as the protective oxide layer developed. A typical two-layer alumina grain structure was observed in both environments. An oxide growth mechanism of the Fe-13Cr-4.5Al-ODS alloy is proposed, emphasizing the effect of water vapor. Highlights: The parabolic oxidation rate constant of the ODS alloy in moist air at 1100–1200 ℃ was higher than that in dry air. The phases formed in dry air were α-Al2 O3, Fe(Cr) and FeAl2 O4, whereas that in moist air lacked FeAl2 O4 spinel. Compared with dry air, the grain size of columnar alumina in moist air was much smaller. Segregation of Zr and Ti at the grain boundary, and Y enrichment at the gas/oxide interface was observed.