Dual role of hydrogen in fatigue life of 316L austenitic stainless steel

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-06 DOI:10.1016/j.ijfatigue.2025.108975

Chenyu Zhao , Lisheng Deng , Shuang Wu , Weijie Wu , Yawei Peng , Xiaowei Wang , Yong Jiang , Jianming Gong

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Abstract

The presence of hydrogen can significantly alter the fatigue behavior of materials, posing a serious threat to the safe and reliable operation of components. In this study, an electrochemical in-situ hydrogen charging fatigue testing method was used to examine the effect of hydrogen on the fatigue strength and lifetime of 316L austenitic stainless steel. The impact of hydrogen on fatigue fracture behavior was analyzed using scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). The results indicated that, compared to specimens tested in air, in-situ charging increases the fatigue lifetime at higher stress amplitudes but significantly reduces it at lower stress amplitudes. Regardless of the testing environment, the crack initiation lifetime constitutes the majority of the total fatigue lifetime. Notably, at higher stress amplitudes, hydrogen greatly extends the fatigue crack initiation lifetime, whereas, at lower stress amplitudes, it has the opposite effect. This is attributed to the influence of hydrogen on dislocation motion patterns, which lowers the critical stress for dislocation plane slip. Hydrogen plays a dual role in the fatigue behavior of 316L steel.

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氢在316L奥氏体不锈钢疲劳寿命中的双重作用

氢气的存在会显著改变材料的疲劳行为，对部件的安全可靠运行构成严重威胁。采用电化学原位充氢疲劳试验方法，研究了氢气对316L奥氏体不锈钢疲劳强度和寿命的影响。采用扫描电镜（SEM）和电子背散射衍射（EBSD）分析了氢对疲劳断裂行为的影响。结果表明，与在空气中测试的试样相比，原位充装能提高试样在高应力幅值下的疲劳寿命，但显著降低试样在低应力幅值下的疲劳寿命。无论在何种试验环境下，裂纹起裂寿命都占总疲劳寿命的大部分。值得注意的是，在高应力幅值下，氢能显著延长疲劳裂纹萌生寿命，而在低应力幅值下，则相反。这是由于氢对位错运动模式的影响，降低了位错平面滑移的临界应力。氢在316L钢的疲劳行为中起双重作用。

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

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.