The structure dependence of grain boundary passivation of Alloy 690 in high temperature water

被引：15
作者：
Feng, Xingyu [1 ,2 ]
Zhang, Shihao [1 ]
Liu, Pengshuai [1 ]
Kuang, Wenjun [1 ]
机构：
[1] Xi An Jiao Tong Univ, Ctr Adv Mat Performance Nanoscale CAMP Nano, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Xian Rare Met Mat Inst Co Ltd, Xian 710016, Peoples R China
来源：
ACTA MATERIALIA | 2023年 / 261卷
基金：
中国国家自然科学基金;
关键词：
Alloy; 690; STEM; Grain boundary structure; Grain boundary diffusion; Internal/external oxidation transition; STRESS-CORROSION CRACKING; INTERGRANULAR OXIDATION; DIFFUSION; ORIENTATION; NI; MIGRATION; BEHAVIOR; CR; SUSCEPTIBILITY; DISLOCATION;
D O I：
10.1016/j.actamat.2023.119368
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The oxidation behavior of grain boundaries (GBs) was investigated on Alloy 690 after exposure to simulated pressurized water reactor primary water. The tendency to form passive film above GB is positively related to Cr diffusivity along GB which is determined by GB structure. Highly-ordered GB like twin boundary is subject to penetrative oxidation as Cr diffusivity is very low. GBs with misorientation angle theta <= 17.4 degrees can't support fast diffusion of Cr either and also show penetrative oxidation. When theta ranges between 17.4 degrees and 28.7 degrees, Cr diffusivity is enhanced a little and GB shows unstable passivation. Meanwhile, the Cr diffusivity along GB is also related to the atomic packing density of GB planes. GB with higher atom packing density exhibits lower Cr diffusivity and deeper intergranular oxide depth. As theta increases above 28.7 degrees, Cr diffusion is fast enough to support the formation of protective film above GB.
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页数：11
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