Effect of Ti on the Corrosion Behavior of Fe22Cr5Al3Mo Alloy in 500oC Superheated Steam
Received date: 2021-05-12
Revised date: 2021-09-05
Online published: 2021-09-22
Supported by
National Natural Science Foundation of China(51871141)
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 500oC 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 500oC 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 500oC 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 R0.5Ti > R1.0Ti > R0Ti, 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
Rongrong SUN , Meiyi YAO , Xiaodong LIN , Wenhuai ZHANG , Yunlong QIU , Lijuan HU , Yaoping XIE , Jian YANG , Jianxin DONG , Guoguang CHENG . Effect of Ti on the Corrosion Behavior of Fe22Cr5Al3Mo Alloy in 500oC Superheated Steam[J]. Acta Metall Sin, 2022 , 58(5) : 610 -622 . DOI: 10.11900/0412.1961.2021.00200
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