Modeling hydrogen-assisted fatigue crack growth in low-carbon steel focusing on thermally activated hydrogen-dislocation interaction.

IF 7.4 3区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Advanced Materials Pub Date : 2024-12-20 eCollection Date: 2025-01-01 DOI:10.1080/14686996.2024.2436345

Osamu Takakuwa, Yuhei Ogawa

引用次数: 0

Abstract

Hydrogen-assisted (HA) fatigue crack growth (FCG) occurs in ferritic steels, wherein H-dislocation interaction plays a vital role. We aim to model the HAFCG mechanism based on the obstruction of dislocations within the crack tip zone. Our modeling framework is as follows: H is condensed into crack tip and trapped by dislocations; these H significantly decrease dislocation mobility; stress relief via crack blunting is suppressed; localized brittle fracture triggers HAFCG. This model was substantiated experimentally in H₂ gas at various load frequencies and temperatures. Theoretical formulations were established considering the thermal equilibrium of H-trapping and dislocation breakaway from the H atmosphere.

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基于热激活氢-位错相互作用的低碳钢氢辅助疲劳裂纹扩展模型。

铁素体钢发生氢辅助（HA）疲劳裂纹扩展（FCG），其中h位错相互作用起重要作用。我们的目标是建立基于位错在裂纹尖端区域内阻碍的HAFCG机制模型。我们的建模框架如下：H被压缩到裂纹尖端并被位错捕获；这些H显著降低了位错迁移率；裂纹钝化引起的应力释放受到抑制；局部脆性断裂触发HAFCG。该模型在不同负载频率和温度下的H2气体中得到了实验证实。建立了考虑氢捕获和位错脱离氢大气热平衡的理论公式。

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

Science and Technology of Advanced Materials 工程技术-材料科学：综合

CiteScore

10.60

自引率

3.60%

发文量

审稿时长

4.8 months

期刊介绍： Science and Technology of Advanced Materials (STAM) is a leading open access, international journal for outstanding research articles across all aspects of materials science. Our audience is the international community across the disciplines of materials science, physics, chemistry, biology as well as engineering. The journal covers a broad spectrum of topics including functional and structural materials, synthesis and processing, theoretical analyses, characterization and properties of materials. Emphasis is placed on the interdisciplinary nature of materials science and issues at the forefront of the field, such as energy and environmental issues, as well as medical and bioengineering applications. Of particular interest are research papers on the following topics: Materials informatics and materials genomics Materials for 3D printing and additive manufacturing Nanostructured/nanoscale materials and nanodevices Bio-inspired, biomedical, and biological materials; nanomedicine, and novel technologies for clinical and medical applications Materials for energy and environment, next-generation photovoltaics, and green technologies Advanced structural materials, materials for extreme conditions.