Hydrogen Resistance of X52 Pipeline Steel Under Hydrogen Environment

被引：0
|
作者：
Bai G. [1 ]
Wang Q. [2 ]
Deng H. [2 ]
Li D. [2 ]
Li Y. [1 ]
机构：
[1] School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an
[2] Sinopec Petroleum Engineering Zhongyuan Corporation, Puyang
来源：
Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 22期
基金：
中国国家自然科学基金;
关键词：
Electrochemical hydrogen charging; Fatigue crack growth; Hydrogen embrittlement; Pipeline steel; Slow strain rate tension (SSRT);
D O I：
10.11896/cldb.19070188
中图分类号：
学科分类号：
摘要：
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. © 2020, Materials Review Magazine. All right reserved.
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页码：22130 / 22135
页数：5
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