Assessment of the impact of hydrogen on the stress developed ahead of a fatigue crack

被引：24

作者：

Wang, Shuai ^{[1
,2
]}

Nagao, Akihide ^{[3
,4
]}

Sofronis, Petros ^{[3
,5
]}

Robertson, Ian M. ^{[1
,6
]}

机构：

[1] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA

[2] Southern Univ Sci & Technol, Dept Mech & Energy Engn, 1088 Xueyuan Blvd, Shenzhen 518055, Peoples R China

[3] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Moto Oka, Fukuoka, Fukuoka 8190395, Japan

[4] JFE Steel Corp, Steel Res Lab, Mat Surface & Interface Sci Res Dept, Kawasaki Ku, 1-1 Minamiwatarida Cho, Kawasaki, Kanagawa 2100855, Japan

[5] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA

[6] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

来源：

ACTA MATERIALIA | 2019年 / 174卷

基金：

美国国家科学基金会;

关键词：

Hydrogen embrittlement; Low-carbon steel; Fatigue-crack growth; Plastic zone; Stress magnitude; Electron microscopy; PLASTIC ZONE SIZE; DISLOCATION-STRUCTURES; STRAIN; GROWTH; CARBON; EMBRITTLEMENT; DEFORMATION; PROPAGATION; MECHANISM;

D O I：

10.1016/j.actamat.2019.05.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure generated in a low carbon steel under cyclic loading in air and a 40 MPa gaseous hydrogen environment has been compared as a function of distance from the crack tip. The presence of hydrogen resulted in the formation of a smaller and more equiaxed dislocation cell structure that extended further from the crack tip than the one generated in air. This enhancement and extension of the dislocation structure by hydrogen is consistent with it modifying the generation rate and mobility of dislocations as well as dislocation interactions. Qualitative assessment of the dislocation structure ahead of the crack tip found the stress ahead of the crack tip to vary linearly as In(1/x), where x is the distance from the crack tip irrespective of the test environment. Hydrogen caused a shift to higher stresses, implying the critical damage level for crack propagation will be achieved more rapidly with a concomitant increase in the crack propagation rate. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：181 / 188

页数：8

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