Fe22Cr5Al3Mo-xY合金在模拟LOCA下的高温蒸汽氧化行为
收稿日期: 2021-10-08
修回日期: 2021-12-20
网络出版日期: 2022-05-20
基金资助
国家自然科学基金项目(51871141)
High-Temperature Steam Oxidation Behavior of Fe22Cr5Al3Mo-xY Alloy Under Simulated LOCA Condition
Received date: 2021-10-08
Revised date: 2021-12-20
Online published: 2022-05-20
Supported by
National Natural Science Foundation of China(51871141)
利用带蒸汽发生器的同步热分析仪对Fe22Cr5Al3Mo-xY (x = 0、0.15，质量分数，%)合金分别进行1000和1200℃下恒温2 h的高温蒸汽氧化实验。采用XRD、FIB、EDS和TEM观察分析氧化前后样品的显微组织、晶体结构和成分。结果表明，添加0.15%Y使FeCrAl合金在1000℃下的氧化增重速率增大，但可降低FeCrAl合金在1200℃下的氧化增重速率，同时还可以抑制氧化膜表面脊状形貌的形成，并提高了合金氧化膜的厚度均匀性以及界面平整度；2种合金在1000和1200℃的高温蒸汽下恒温2 h后形成的氧化物膜均为α-Al2O3，在Al2O3膜中平行于氧化膜/基体(O/M)界面的Fe、Cr富集区为hcp-(Cr, Fe)2O3；Fe22Cr5Al3Mo-0.15Y合金在1200℃下恒温2 h后氧化膜中朝向基体一侧生长的富Y氧化物中存在AlYO3、Y2O3和Fe(Cr, Al)2O4尖晶石氧化物。从Y影响氧化膜显微组织演化的角度探讨了Y对不同温度下FeCrAl合金氧化行为的影响机制。
孙蓉蓉 , 姚美意 , 王皓瑜 , 张文怀 , 胡丽娟 , 仇云龙 , 林晓冬 , 谢耀平 , 杨健 , 董建新 , 成国光 . Fe22Cr5Al3Mo-xY合金在模拟LOCA下的高温蒸汽氧化行为[J]. 金属学报, 2023 , 59(7) : 915 -925 . DOI: 10.11900/0412.1961.2021.00420
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 1200oC 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 1200oC 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 1000oC high-temperature steam, but decreases the weight gain rate of FeCrAl alloy in 1200oC 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 1200oC 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 1200oC 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.
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