高压氢作用下高强钢裂纹闭合对疲劳裂纹扩展的抑制作用

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-08-11 DOI:10.1016/j.ijfatigue.2025.109235

Aman Arora , Akinobu Shibata , Hisao Matsunaga

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引用次数: 0

摘要

以抗拉强度为1500 MPa的3Mn-0.2C马氏体钢为材料，在90 MPa的氢气条件下，研究了氢对疲劳裂纹扩展的影响。令人惊讶的是，在特定的载荷条件下，这种钢在氢气中表现出明显的裂纹闭合，导致与空气中相比，FCG率大大降低。在相对较低的应力强度因子下，由粗糙度和塑性引起的裂纹闭合显著延缓了氢介质中的FCG。然而，除去裂纹闭合的影响，氢确实降低了固有的FCG阻力。进一步分析表明，块体边界内聚强度的降低取决于塑性区大小和块体纵轴与宏观FCG方向的倾角。因此，即使在高压氢环境下的高强度钢中，氢增强的塑性介导的脱粘也会导致FCG的循环依赖加速。

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Fatigue crack growth retardation due to crack closure in high-strength steel under high-pressure hydrogen

The influence of hydrogen on fatigue crack growth (FCG) was investigated in 90 MPa hydrogen gas using a 3Mn-0.2C martensitic steel with a tensile strength of 1500 MPa. Surprisingly, this steel exhibited significant crack closure in hydrogen gas under specific loading conditions, resulting in considerably lower FCG rates compared to those in air. The roughness- and plasticity-induced crack closure markedly retarded the FCG in hydrogen in a relatively low stress intensity factor regime. However, intrinsic FCG resistance, excluding the effect of crack closure, was indeed degraded by hydrogen. Further analysis revealed that the reduction in cohesive strength of block boundaries depended on the plastic zone size and the inclination angle between the longitudinal axis of the blocks and the macroscopic FCG direction. Consequently, hydrogen-enhanced plasticity-mediated decohesion led to cycle-dependent acceleration of FCG, even in such high-strength steel under high-pressure hydrogen environments.

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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.