Microstructural evolution of the inner oxide layer of a Si-modified austenitic stainless steel exposed to oxygen-saturated lead-bismuth eutectic (LBE): Toward the origin of LBE penetration

被引：1
|
作者：
Xie, Ang [1 ,2 ]
Chen, Shenghu [1 ]
Yin, Lichang [3 ]
He, Neng [3 ]
Chen, Chunlin [3 ]
Rong, Lijian [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 237卷
基金：
中国国家自然科学基金;
关键词：
Si-modified austenitic stainless steel; Lead-bismuth eutectic; Internal oxidation; Dissolution corrosion; Atom probe tomography; LIQUID PB-BI; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; CORROSION BEHAVIOR; OXIDATION BEHAVIOR; DEGREES-C; FERRITIC/MARTENSITIC STEELS; STRUCTURAL-MATERIALS; ELECTRON-MICROSCOPY; FE-9CR-1MO STEEL;
D O I：
10.1016/j.corsci.2024.112350
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructural evolution of inner oxide layer of a Si-modified austenitic stainless steel exposed to oxygensaturated static lead-bismuth eutectic (LBE) at 550 degrees C up to 3000 h has been investigated. A dual-phase separated structure consisting of Fe-Cr spinel and (Fe, Cr)1-xNix phase is formed in inner oxide layer, attributed to partitioning of Ni and Cr associated with Fe-Cr spinel formation. SiO2 is preferentially formed preceding the FeCr spinel at internal oxidation frontier, leading to dispersed SiO2 nanoparticles within Fe-Cr spinel. The mechanism of LBE penetration into inner oxide layer is further developed based on preferable dissolution process of (Fe, Cr)1-xNix phase.
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页数：18
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