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.

引用

页数：15

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