Unveiling remarkable hydrogen accumulation near ferrite crack tip: Role of unloading effect

被引：4
作者：
Wu, Weijie [1 ,2 ]
Deng, Junfeng [1 ,2 ]
Zhao, Chenyu [1 ,2 ]
Wang, Xiaowei [1 ,2 ]
Li, Jinxu [3 ]
Gong, Jianming [1 ,2 ]
机构：
[1] Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
[2] Jiangsu Key Lab Design & Manufacture Extreme Press, Nanjing 211816, Peoples R China
[3] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Corros & Protect Ctr, Beijing 100083, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 895卷
基金：
中国国家自然科学基金;
关键词：
Ferrite; Stress -driven diffusion; Hydrogen trapping; Crack; MICROPRINT TECHNIQUE; EMBRITTLEMENT; STEEL; THERMODYNAMICS; VISUALIZATION; MULTISCALE; DIFFUSION; TRANSPORT; GROWTH;
D O I：
10.1016/j.msea.2024.146253
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We investigate the effect of stress state and hydrogen traps on hydrogen distribution proximity to ferrite crack tip. The results of hydrogen microprint and microstructure characterization indicate that diffusible hydrogen accumulates within crack wake, but the region of hydrogen enrichment ahead of crack tip is tiny according to Ag distribution. By comparing experimental data and numerical calculations, we conclude that the unloadinginduced compressive stress region ahead of the crack tip leads to the formation of an overall diffusible Hdepleted zone, thereby inhibiting the forward progression of the Ag enrichment zone ahead of the crack tip, whereas the extended size of Ag clustering area within crack plastic wake is primarily attributed to the level of crack plasticity generating dislocation and vacancy traps.
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页数：6
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