Fe22Cr5Al3Mo-xY合金在模拟LOCA下的高温蒸汽氧化行为

doi:10.11900/0412.1961.2021.00420

金属学报

2023, Vol. 59

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

研究论文

本期目录 | 过刊浏览

Fe22Cr5Al3Mo-xY合金在模拟LOCA下的高温蒸汽氧化行为

孙蓉蓉¹, 姚美意¹(

), 王皓瑜¹, 张文怀¹, 胡丽娟¹, 仇云龙², 林晓冬¹, 谢耀平¹, 杨健³, 董建新⁴, 成国光⁵

¹上海大学材料研究所上海 200072
²中兴能源装备有限公司海门 226126
³上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室上海 200444
⁴北京科技大学材料科学与工程学院北京 100083
⁵北京科技大学钢铁冶金新技术国家重点实验室北京 100083

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

引用本文:

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

全文: PDF(3324 KB) HTML

摘要:

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。

关键词 ： FeCrAl合金, Y, 高温蒸汽, 失水事故, 显微组织

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

收稿日期: 2021-10-08

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51871141)

通讯作者: 姚美意，yaomeiyi@shu.edu.cn，主要从事核燃料包壳材料锆合金和容错燃料(ATF)包壳材料的研究

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

作者简介: 孙蓉蓉，女，1993年生，博士

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	孙蓉蓉
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	张文怀
	胡丽娟
	仇云龙
	林晓冬
	谢耀平
	杨健
	董建新
	成国光
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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00420 或 https://www.ams.org.cn/CN/Y2023/V59/I7/915

表1 FeCrAl合金的化学成分 (mass fraction / %)

图1 0Y和0.15Y合金的XRD谱

图2 0Y和0.15Y合金在1000和1200℃的高温蒸汽条件下恒温2 h的氧化动力学曲线

表2 0Y和0.15Y合金在1000和1200℃高温蒸汽条件下恒温2 h的抛物线速率常数 (mg2·dm-4·s-1)

图3 0Y和0.15Y合金在1000和1200℃的高温蒸汽条件下恒温2 h的氧化膜外表面显微组织的SEM像

图4 0Y和0.15Y合金在1000和1200℃高温蒸汽条件下恒温2 h的氧化膜截面显微组织的高角环形暗场(HAADF)像(图3中虚线位置)

图5 0Y和0.15Y合金在1000和1200℃高温蒸汽条件下恒温2 h的氧化膜截面的HAADF像和EDS面扫描图

图6 图5a中Line 1 EDS线扫描图

图7 0.15Y合金在1000和1200℃的高温蒸汽条件下恒温2 h的氧化膜截面不同区域的TEM像及选区电子衍射(SAED)和快速Fourier变换(FFT)花样

图8 FeCrAl合金在高温蒸汽中的氧化过程示意图

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