Effect of Ti on the Corrosion Behavior of Fe22Cr5Al3Mo Alloy in 500oC Superheated Steam

doi:10.11900/0412.1961.2021.00200

Acta Metall Sin

2022, Vol. 58

Issue (5): 610-622 DOI: 10.11900/0412.1961.2021.00200

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Effect of Ti on the Corrosion Behavior of Fe22Cr5Al3Mo Alloy in 500^oC Superheated Steam

SUN Rongrong¹, YAO Meiyi¹(

), LIN Xiaodong¹(

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

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

Cite this article:

SUN Rongrong, YAO Meiyi, LIN Xiaodong, ZHANG Wenhuai, QIU Yunlong, HU Lijuan, XIE Yaoping, YANG Jian, DONG Jianxin, CHENG Guoguang. Effect of Ti on the Corrosion Behavior of Fe22Cr5Al3Mo Alloy in 500^oC Superheated Steam. Acta Metall Sin, 2022, 58(5): 610-622.

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Abstract

Zirconium alloys can react with water to produce hydrogen under a loss of coolant accident, which can lead to a hydrogen explosion. Therefore, the idea of developing accident tolerant fuel (ATF) is proposed, which involves nuclear fuel and cladding. FeCrAl alloy is a promising candidate material for ATF cladding. Studying the effects of alloying elements on the corrosion behavior and mechanism of FeCrAl alloy can provide a theoretical basis and guidance for optimizing its composition. Therefore, in this study, the effect of Ti on the corrosion behavior of Fe22Cr5Al3Mo alloy in 500^oC superheated steam was investigated. Three types of Fe22Cr5Al3Mo-xTi (x = 0, 0.5, 1.0, mass fraction, %) alloys, designated as 0Ti, 0.5Ti, and 1.0Ti alloys, respectively, were fabricated and corroded in 500^oC and 10.3 MPa superheated steam using a static autoclave. The microstructure, crystal structure and composition of the samples before and after corrosion were observed using XRD, OM, FIB/SEM, EDS, and TEM. The results show that the oxide films formed on the Fe22Cr5Al3Mo-xTi alloys in 500^oC and 10.3 MPa superheated steam present a trilayer structure consisting of an outer oxide layer of Fe₂O₃, a middle layer of hcp-Cr₂O₃, and an inner layer of Al₂O₃. There is α-(Fe, Cr) in the Al₂O₃ layer near the oxide/metal interface. The ratio, R, of Cr oxide film thickness to total oxide film thickness for 0Ti, 0.5Ti, and 1.0Ti alloys follows the order R_0.5Ti > R_1.0Ti > R_0Ti, which may explain the better corrosion resistance of 0.5Ti alloy than 1.0Ti and 0Ti alloys. The addition of Ti can reduce the total thickness of the oxide films and improve the corrosion resistance of the alloys by increasing the thickness of the protective hcp-Cr₂O₃ film and inhibiting the precipitation of Cr₂₃C₆.

Key words: FeCrAl alloy Ti corrosion oxide film microstructure

Received: 12 May 2021

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51871141)

About author: YAO Meiyi, professor, Tel: 17721378029, E-mail: yaomeiyi@shu.edu.cnLIN Xiaodong, Tel: 18609825539, E-mail: xdlin@shu.edu.cn

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

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00200 OR https://www.ams.org.cn/EN/Y2022/V58/I5/610

Table 1 Compositions of alloys used in the present work

Fig.1 OM images of 0Ti (a), 0.5Ti (b), and 1.0Ti (c) alloys

Fig.2 XRD spectra of 0Ti, 0.5Ti, and 1.0Ti alloys

Alloy	Crystal plane index (hkl)						$a ¯$ / nm
	(110)		(200)		(211)
	2θ / (°)	d / nm	2θ / (°)	d / nm	2θ / (°)	d / nm
α-Fe	44.67	0.20268	65.02	0.14332	82.33	0.11702	0.28664
0Ti	44.15	0.20495	64.24	0.14487	81.45	0.11807	0.28960
0.5Ti	44.18	0.20482	64.24	0.14487	81.42	0.11810	0.28956
1.0Ti	44.28	0.20439	64.36	0.14463	81.42	0.11810	0.28920

Table 2 XRD characteristic peak parameters (the diffraction half angle of θ, the interplanar crystal spacing of d) and average lattice constant (

a ¯

) of α-Fe, 0Ti, 0.5Ti, and 1.0Ti alloys

Fig.3 TEM images (a1-a6) and SAED patterns of P1-P6 (b1-b6) of typical second phase particles in 0Ti (a1, a2), 0.5Ti (a3, a4), and 1.0Ti (a5, a6) alloys (fcc—face centered cubic, o—orthorhombic, hcp—hexagonal close packed, c—primitive cubic, mc—base centered monoclinic)

Table 3 Statistics of size for typical second phase particles in 0Ti, 0.5Ti, and 1.0Ti alloys

Fig.4 EDS mappings of TiN in the matrix of 0.5Ti (a) and 1.0Ti (b) alloys corroded in 500^oC and 10.3 MPa superheated steam for 1000 h

Fig.5 SEM images of surface morphologies of oxide films formed on 0Ti (a1^[24]-a3), 0.5Ti (b1-b3), and 1.0Ti (c1-c3) alloys corroded in 500^oC and 10.3 MPa superheated steam for 3 h (a1^[24]-c1), 500 h (a2-c2), and 1000 h (a3-c3)

Fig.6 HAADF images of the cross-sectional oxide films formed on the 0Ti (a1^[24], a2^[24], a3), 0.5Ti (b1-b3), and 1.0Ti (c1-c3) alloys corroded in 500^oC and 10.3 MPa superheated steam for 3 h (a1^[24]-c1), 500 h (a2^[24]-c2), and 1000 h (a3-c3)

Table 4 Average thicknesses of oxide films formed on the 0Ti, 0.5Ti, and 1.0Ti alloys corroded in 500^oC and 10.3 MPa superheated steam for 3 h, 500 h, and 1000 h

Fig.7 HAADF image and EDS mappings of cross-sectional oxide film formed on 0.5Ti alloy corroded in 500^oC and 10.3 MPa superheated steam for 1000 h

Fig.8 TEM images and SAED patterns of different areas (insets) in the cross-sectional oxide films formed on 0Ti (a), 0.5Ti (b-f), and 1.0Ti (g) alloys corroded in 500^oC and 10.3 MPa superheated steam for 500 h (a-c, g) and 1000 h (d-f) (m—monoclinic, bcc—body centered cubic)

Table 5 Crystal structures of oxide films formed on 0Ti, 0.5Ti, and 1.0Ti alloys corroded in 500^oC and 10.3 MPa super-heated steam for 3 h, 500 h, and 1000 h

Fig.9 Schematics of corrosion process of FeCrAl alloys in 500^oC and 10.3 MPa superheated steam
(a) Fe₂O₃ is preferentially formed on the thin original mixed layer of oxides
(b) the mixed oxide region of Cr and Al is formed
(c) Cr₂O₃ formed at the interface between Fe₂O₃ and the mixed oxide region of Cr and Al, while the Al₂O₃ formed at the O/M interface
(d) unoxidized Fe and Cr near O/M interface exist in the form of α-(Fe, Cr)

Table 6 Average thicknesses of iron oxide film, chromium oxide film, aluminum oxide film, and overlap area formed on the 0Ti, 0.5Ti, and 1.0Ti alloys corroded in 500^oC and 10.3 MPa superheated steam for 500 h

Table 7 Ratios of chromium oxide film thickness to total oxide film thickness for the 0Ti, 0.5Ti, and 1.0Ti alloys corroded in 500^oC and 10.3 MPa super-heated steam for 3 h, 500 h, and 1000 h

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