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

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

Corrosion Science Pub Date : 2024-11-17 DOI:10.1016/j.corsci.2024.112577

Jiamei Wang , Tianyu Zhu , Yule Wu , Kai Chen , Xianglong Guo , Quanyao Ren , Yuanming Li , Chuanbao Tang , Hongpu Yi , Liang Ye , Shihao Xu , Jing Zhang , Wenxi Tian , Lefu Zhang

引用次数: 0

Abstract

The stress corrosion cracking (SCC) propagation behavior of solution-annealed and precipitation-hardened Alloy 718 was investigated. The results show γ″ and γ′ 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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纳米级析出物对压水堆一次水中恒定载荷下合金 718 应力腐蚀裂纹扩展的影响

研究了固溶退火和沉淀硬化合金 718 的应力腐蚀开裂（SCC）扩展行为。结果表明，γ″和γ′析出物有利于延缓恒定载荷下的裂纹生长。晶界（GB）上的纳米级析出物往往会阻碍 GB 向裂纹尖端以外的迁移和氧化，从而弥补了因屈服强度显著提高而产生的较陡应变梯度所带来的不利影响。在氢化水中（Ni/NiO 边界附近）观察到的 CGR 增加了 2-40 倍，这主要归因于 GB 在相变过程中优先氧化和氧化物的不稳定性。

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.