Unveiling the role of irradiation in stress corrosion cracking of alloy 690

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

Corrosion Science Pub Date : 2025-09-05 DOI:10.1016/j.corsci.2025.113303

Donghai Du , Tenghong Lin , Mi Wang , Miao Song , Hefei Huang , Gary S. Was

引用次数: 0

Abstract

Oxidized grain boundaries (GBs) in Alloy 690 samples from both unirradiated and irradiated regions were systematically characterized following constant extension rate tensile testing in a simulated pressurized water reactor primary water environment. Comparative analysis revealed distinct degradation mechanisms: significant chromium depletion occurred at carbide-free GBs, while crack initiation predominated at carbide-decorated GBs in irradiated specimens. Notably, irradiated regions exhibited substantially higher strain localization at both GBs and carbide/matrix interfaces compared to unirradiated GBs. These observations demonstrate that irradiation enhances stress corrosion cracking susceptibility through two synergistic mechanisms: radiation-enhanced diffusion along GBs and intensified strain localization at carbide/matrix interfaces.

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揭示辐照在690合金应力腐蚀开裂中的作用

在模拟压水堆一次水环境中进行恒定拉伸速率拉伸试验，系统表征了690合金样品中未辐照区和辐照区氧化晶界（GBs）。对比分析揭示了不同的降解机制：在辐照样品中，无碳化物的gb发生明显的铬损耗，而在有碳化物装饰的gb则主要发生裂纹萌生。值得注意的是，与未辐照的GBs相比，辐照区域在GBs和碳化物/基体界面上都表现出更高的应变局域化。这些观察结果表明，辐照通过两种协同机制提高了应力腐蚀开裂敏感性：辐射增强了沿GBs的扩散和强化了碳化物/基体界面的应变局部化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.