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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建模。

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

作者信息

Takakuwa Osamu, Ogawa Yuhei

机构信息

Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan.

Research Center for Structural Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan.

出版信息

Sci Technol Adv Mater. 2024 Dec 20;26(1):2436345. doi: 10.1080/14686996.2024.2436345. eCollection 2025.

DOI:10.1080/14686996.2024.2436345
PMID:39777124
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11703130/
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 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 H 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.

摘要

氢辅助（HA）疲劳裂纹扩展（FCG）发生在铁素体钢中，其中氢与位错的相互作用起着至关重要的作用。我们旨在基于裂纹尖端区域内的情况对氢辅助疲劳裂纹扩展机制进行建模。我们的建模框架如下：氢在裂纹尖端聚集并被位错捕获；这些氢显著降低位错迁移率；通过裂纹钝化实现的应力释放受到抑制；局部脆性断裂引发氢辅助疲劳裂纹扩展。该模型在不同载荷频率和温度的氢气中通过实验得到了证实。考虑到氢捕获的热平衡和位错从氢气氛中的脱离，建立了理论公式。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/a7957fd5f537/TSTA_A_2436345_F0008_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/bbea20794393/TSTA_A_2436345_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/540ead10d9ac/TSTA_A_2436345_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/a1725d012390/TSTA_A_2436345_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/97d1c8556765/TSTA_A_2436345_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/9950abed68f5/TSTA_A_2436345_F0004_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/92efd9d91757/TSTA_A_2436345_F0005_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/bb06edbaa1f7/TSTA_A_2436345_F0006_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/0a225a7e65b3/TSTA_A_2436345_F0007_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/a7957fd5f537/TSTA_A_2436345_F0008_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/bbea20794393/TSTA_A_2436345_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/540ead10d9ac/TSTA_A_2436345_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/a1725d012390/TSTA_A_2436345_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/97d1c8556765/TSTA_A_2436345_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/9950abed68f5/TSTA_A_2436345_F0004_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/92efd9d91757/TSTA_A_2436345_F0005_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/bb06edbaa1f7/TSTA_A_2436345_F0006_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/0a225a7e65b3/TSTA_A_2436345_F0007_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/873d/11703130/a7957fd5f537/TSTA_A_2436345_F0008_OC.jpg

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本文引用的文献

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Hydrogen-enhanced cracking revealed by micro-cantilever bending test inside environmental scanning electron microscope.环境扫描电子显微镜内微悬臂梁弯曲试验揭示的氢致开裂
Philos Trans A Math Phys Eng Sci. 2017 Jul 28;375(2098). doi: 10.1098/rsta.2017.0106.
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A review of strain analysis using electron backscatter diffraction.利用电子背散射衍射进行应变分析综述。
Microsc Microanal. 2011 Jun;17(3):316-29. doi: 10.1017/S1431927611000055. Epub 2011 Mar 22.