氢环境下X52管线钢的抗氢性能

doi:10.11896/cldb.19070188

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Abstract As a new technology for hydrogen transporting, hydrogen and compressed nature gas (HCNG) has significance on the realization of large-scale hydrogen transportationby pipeline network. However, the presence of hydrogen will lead to the mechanical properties degradation of pipeline metal, which seriously threatens the safe use of pipeline network. X52 pipeline steel was chosen as the research object. The influence of hydrogen charging current density on the tensile property of X52 was studied by simultaneous cathodic charging and slow straining rate test. The influence of electrolytic hydrogen environment on crack growth rate of X52 was studied through fatigue crack growth test. In addition, the fracture morphology of tensile and fatigue specimens was observed by means of SEM to analyze the mechanism of X52 hydrogen embrittlement fracture. Test results show that electrochemical hydrogen charging has effect on mechanical properties of X52. As charging current density elevates, the strength of materials enhances slightly but its plasticity decreases significantly. Changes in the microstructure of the tensile specimen section indicated that the fracture mode of material transforms from dimple ductile fracture to quasi-dissociative brittle fracture with elevated hydrogen charging current density. Electrolytic hydrogen environment will accelerate the crack growth rate of X52. Micro fractures indicate that hydrogen embrittlement mechanism dominates the crack propagation process.

Key words： pipeline steel electrochemical hydrogen charging slow strain rate tension (SSRT) fatigue crack growth hydrogen embrittlement

Published: 02 December 2020

CLC number:

TG172

Fund:This work was supported by Zhejiang Province Key Research and Development Project (2020C01119).

About author:: Yun Liis a professor and doctoral supervisor of chemical engineering department, School of Chemical Engineering and Technology of Xi'an Jiaotong University (XJTU). She has been engaged in research and deve-lopment of efficient fluid machinery, energy conservation research of heat pump system, multiphase reaction simulation and analysis in coal chemical industry, and energy integration technology of process system. Hosted and participated in the National 863 Plan, the National Natural Science Foundation of China, Shaanxi Province Science and Techno-logy Key Projects, and more than 30 horizontal cooperation projects. She has published more than 60 academic papers in domestic and foreign academic journals and conferences, among which 40 are included in SCI and EI. It has obtained 6 patents for invention and 5 patents for utility model. As the fifth accomplisher, “theory, key technology and application of heat pump energy saving in special dielectric energy system” won the second prize of science and technology of Shaanxi Province in 2009.

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	BAI Guangqian
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Cite this article:

BAI Guangqian,WANG Qiuyan,DENG Haiquan, et al. Hydrogen Resistance of X52 Pipeline Steel Under Hydrogen Environment[J]. Materials Reports, 2020, 34(22): 22130-22135.

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http://www.mater-rep.com/EN/10.11896/cldb.19070188 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22130

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