The effect of nano-sized precipitates on stress corrosion cracking propagation of Alloy 718 under constant loads in PWR primary water

被引：0
|
作者：
Wang, Jiamei [1 ]
Zhu, Tianyu [1 ]
Wu, Yule [1 ]
Chen, Kai [1 ]
Guo, Xianglong [1 ]
Ren, Quanyao [2 ]
Li, Yuanming [2 ]
Tang, Chuanbao [2 ]
Yi, Hongpu [2 ]
Ye, Liang [4 ]
Xu, Shihao [4 ]
Zhang, Jing [3 ]
Tian, Wenxi [3 ]
Zhang, Lefu [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China
[2] Nucl Power Inst China, Sci & Technol Reactor Syst Design Technol Lab, Chengdu 610213, Peoples R China
[3] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
[4] China Nucl Power Technol Res Inst Co Lto, Shenzhen 518000, Peoples R China
来源：
CORROSION SCIENCE | 2025年 / 242卷
关键词：
Alloy; 718; Precipitates; Stress corrosion cracking; Crack growth rate; TEM; TKD; STAINLESS-STEEL; HYDROGEN EMBRITTLEMENT; HEAT-TREATMENT; NICKEL-ALLOYS; GROWTH RATE; TEMPERATURE; SCC; BEHAVIOR; MICROSTRUCTURE; PREDICTION;
D O I：
10.1016/j.corsci.2024.112577
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The stress corrosion cracking (SCC) propagation behavior of solution-annealed and precipitation-hardened Alloy 718 was investigated. The results show gamma '' and gamma ' precipitates are beneficial on retarding its crack growth under constant loads. Nano-sized precipitates at grain boundary (GB) tend to impede GB migration and oxidation beyond the crack tip, thereby compensating for the detrimental effect of a steeper strain gradient resulting from prominent elevated yield strength. The observed 2-40 times increase in CGR in hydrogenated water (near the Ni/ NiO boundary) primarily attributes to the preferential GB oxidation and instability of the oxides during phase transition.
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页数：15
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