二次相对718合金在模拟压水堆一次水中SCC萌生的影响

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-04-17 DOI:10.1016/j.corsci.2025.112930

Tianyu Zhu , Jiamei Wang , Miao Song , Quanyao Ren , Xi Qiu , Yuanming Li , Chuanbao Tang , Hongpu Yi , Jing Zhang , Wenxi Tian , YU Ang , Xianglong Guo

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引用次数: 0

摘要

在模拟压水堆原生水环境下，采用慢应变速率拉伸试验（SSRT）研究了含不同析出相的718合金的应力腐蚀开裂（SCC）萌生行为。发现纳米相（γ′，γ”相）和δ相均能提高SCC的敏感性。纳米析出物显著抑制了内部滑移，增加了晶界处的局部应力集中，促进了晶间裂纹的萌生。垂直于加载方向的GBs有利于IG裂纹扩展。δ相的优先氧化和δ/γ界面的优先氧化是裂纹萌生的前兆，从而增加了SCC的敏感性。δ相的形状影响氧化程度，针状δ相的氧化程度更为严重。

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The role of secondary phases on SCC initiation of Alloy 718 in simulated PWR primary water

Stress corrosion cracking (SCC) initiation behavior of Alloy 718 with different precipitates was studied by slow strain rate tensile testing (SSRT) in a simulated pressurized water reactor (PWR) primary water environment. It was found that both nano-precipitates (γ', γ'' phases) and δ phases enhanced the SCC susceptibility. Nano-precipitates significantly suppressed the interior slip and increased the local stress concentration at grain boundaries (GBs), thus promoting the initiation of intergranular (IG) cracks. GBs oriented perpendicular to the loading direction favored IG crack propagation. Preferential oxidation of the δ phases and the δ/γ interface were precursors to crack initiation, thereby increasing the SCC susceptibility. The shape of δ phases affected the oxidation degree, and more severe oxidation was observed on needle-like δ phases.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.