Corrosion fatigue crack initiation mechanism and life prediction model of 316LN considering thermal aging effect in simulated PWR water environment

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

Corrosion Science Pub Date : 2025-10-13 DOI:10.1016/j.corsci.2025.113412

Y.G. Zhao, X.F. Zhang, Y.H. Lu, Z.H. Li, T.G. Liu, T. Shoji

引用次数: 0

Abstract

The effect of thermal aging (0 h- 10000 h at 400 °C) on the corrosion fatigue behavior of domestic 316LN stainless steel in a simulated PWR water environment was investigated. Results demonstrated that thermal aging had a significant influence on the crack initiation mechanism. After thermal aging, the dislocation structure of 316LN gradually became ordered, formed planar dislocation arrays, extended dislocations, and stacking faults. During the corrosion fatigue process, the cyclic deformation mechanism of 316LN shifted from cross slip to dominant single slip, accompanied by the formation of deformation twinning, which reduced crack initiation sources, hindered crack propagation, and increased the corrosion fatigue life. A corrosion fatigue life environmental correction factor (Fen) model considering thermal aging time parameters of 316LN is proposed.

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模拟压水堆水环境中考虑热老化效应的316LN腐蚀疲劳裂纹萌生机理及寿命预测模型

研究了国产316LN不锈钢在模拟压水堆水环境中的热时效（0 h ~ 10000 h, 400℃）对腐蚀疲劳行为的影响。结果表明，热时效对裂纹萌生机制有显著影响。热时效后，316LN的位错结构逐渐有序，形成平面位错阵列、扩展位错和层错。在腐蚀疲劳过程中，316LN的循环变形机制由交叉滑移转变为以单滑移为主，并伴有变形孪晶的形成，减少了裂纹起裂源，阻碍了裂纹扩展，提高了腐蚀疲劳寿命。提出了考虑316LN热老化时间参数的腐蚀疲劳寿命环境校正因子（Fen）模型。

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.