High-Temperature Steam Oxidation Behavior of Fe22Cr5Al3Mo-xY Alloy Under Simulated LOCA Condition

doi:10.11900/0412.1961.2021.00420

Acta Metall Sin

2023, Vol. 59

Issue (7): 915-925 DOI: 10.11900/0412.1961.2021.00420

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High-Temperature Steam Oxidation Behavior of Fe22Cr5Al3Mo-xY Alloy Under Simulated LOCA Condition

SUN Rongrong¹, YAO Meiyi¹(

), WANG Haoyu¹, ZHANG Wenhuai¹, HU Lijuan¹, QIU Yunlong², LIN Xiaodong¹, XIE Yaoping¹, YANG Jian³, DONG Jianxin⁴, CHENG Guoguang⁵

¹Institute of Materials, Shanghai University, Shanghai 200072, China
²Zhongxing Energy Equipment Co., Ltd., Haimen 226126, China
³State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
⁴School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
⁵State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

SUN Rongrong, YAO Meiyi, WANG Haoyu, ZHANG Wenhuai, HU Lijuan, QIU Yunlong, LIN Xiaodong, XIE Yaoping, YANG Jian, DONG Jianxin, CHENG Guoguang. High-Temperature Steam Oxidation Behavior of Fe22Cr5Al3Mo-xY Alloy Under Simulated LOCA Condition. Acta Metall Sin, 2023, 59(7): 915-925.

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Abstract

An increased temperature causes the breakaway oxidation of zirconium alloys and the loss of structural integrity under the loss of coolant accident (LOCA). Thus, to enhance the inherent safety of nuclear reactors, the idea of developing accident-tolerant fuel (ATF) is proposed. One of the promising candidate materials for ATF cladding is FeCrAl alloy. The theoretical basis and guidance for FeCrAl alloy's composition optimization can be obtained by investigating the effects of alloying elements on the oxidation behavior and mechanism. Thus, the effect of Y on the oxidation behavior of Fe22Cr5Al3Mo alloy in 1000 and 1200^oC high-temperature steam was investigated in this study. Two types of Fe22Cr5Al3Mo-xY (x = 0, 0.15, mass fraction, %) alloys, denoted as 0Y and 0.15Y, respectively, were fabricated and oxidized in 1000 and 1200^oC high-temperature steam for 2 h, employing a simultaneous thermal analyzer. The microstructure, crystal structure, and composition of the samples before and after oxidation were analyzed using XRD, FIB, EDS, and TEM. The findings indicate that adding 0.15%Y increases the weight gain rate of FeCrAl alloy in 1000^oC high-temperature steam, but decreases the weight gain rate of FeCrAl alloy in 1200^oC high-temperature steam. Furthermore, adding 0.15%Y can inhibite the formation of ridge morphology on the surface of oxide film and improve the thickness uniformity and interface flatness of oxide film. The oxide films formed on the 0Y and 0.15Y alloys are both α-Al₂O₃ under the condition of 1000 and 1200^oC high-temperature steam for 2 h. In the Al₂O₃ oxide film, there is hcp-(Cr, Fe)₂O₃ paralleled to the oxide/metal (O/M) interface. AlYO₃, Y₂O₃, and Fe(Cr, Al)₂O₄ are present in the Y-rich oxides growing toward the matrix in 0.15Y alloy oxidized in 1200^oC steam. The effect of Y on the oxidation behavior of FeCrAl alloy at various temperatures was discussed from the viewpoint of the influence of Y on the microstructure evolution of oxide film.

Key words: FeCrAl alloy Y high-temperature steam loss of coolant accident (LOCA) microstructure

Received: 08 October 2021

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51871141)

Corresponding Authors: YAO Meiyi, professor, Tel: 17721378029, E-mail: yaomeiyi@shu.edu.cn

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	SUN Rongrong
	YAO Meiyi
	WANG Haoyu
	ZHANG Wenhuai
	HU Lijuan
	QIU Yunlong
	LIN Xiaodong
	XIE Yaoping
	YANG Jian
	DONG Jianxin
	CHENG Guoguang

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00420 OR https://www.ams.org.cn/EN/Y2023/V59/I7/915

Table 1 Chemical compositions of FeCrAl alloys

Fig.1 XRD spectra of 0Y and 0.15Y alloys

Fig.2 Oxidation kinetics curves of 0Y and 0.15Y alloys oxidized in 1000 and 1200^oC steam for 2 h

Table 2 Parabolic rate constants of 0Y and 0.15Y alloys oxidized in 1000 and 1200^oC steam for 2 h

Fig.3 SEM images of surface morphologies of oxide films formed on 0Y (a, b) and 0.15Y (c, d) alloys oxidized in 1000^oC (a, c) and 1200^oC (b, d) steam for 2 h (The elliptic regions in Figs.3c and d stand for the granular oxide and the angular oxide, respectively)

Fig.4 High-angle annular dark field (HAADF) images of the cross-sectional oxide films formed on the 0Y (a, b) and 0.15Y (c, d) alloys oxidized in 1000^oC (a, c) and 1200^oC (b, d) steam for 2 h (the positions of dotted line in Fig.3) (Region indicated by arrow in Fig.4c stands for pores, the area of D1 in Fig.4d stands for the HAADF image of the cross-sectional angular oxide in Fig.3d)

Fig.5 HAADF images and corresponding EDS mapping of cross-sectional oxide films formed on 0Y (a, b) and 0.15Y (c, d) alloys oxidized in 1000^oC (a, c) and 1200^oC (b, d) steam for 2 h

Fig.6 EDS line scanning corresponding to line 1 in Fig.5a

Fig.7 TEM images, selected area electron diffraction (SAED) and fast Fourier transformation (FFT) patterns (insets) of different areas in the cross-sectional oxide films formed on 0.15Y alloy oxidized in 1000^oC (a, b) and 1200^oC (c-e) steam for 2 h (hcp—hexagonal close packed, o—orthorhombic, bcc—body centered cubic, fcc—face centered cubic)

Fig.8 Schematics of oxidation process of FeCrAl alloys in high-temperature steam
(a) Fe _x O _y is preferentially formed on the alloy surface
(b) the mixed oxide region of Cr and Al is formed
(c) Cr₂O₃ formed at the interface between Fe _x O _y and the mixed oxide region of Cr and Al, while the Al₂O₃ formed at the oxide/metal (O/M) interface
(d) at high temperature, Cr₂O₃ converts to CrO₃ and evaporates, and Fe _x O _y reacts with high-temperature steam to produce volatile hydroxide
(e) as the oxidation goes on, the γ-Al₂O₃ transforms into α-Al₂O₃
(f) the oxide film of FeCrAl alloy is α-Al₂O₃ under the condition of high-temperature steam

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