Hydrogen induced cracking of X80 pipeline steel

查看全文 作　　者：Chao-fang Dong Kui Xiao Zhi-yong Liu Wen-jing Yang Xiao-gang [1]Li

机构地区：[1]Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2010年第17卷第5期,共8页

基　　金：supported by the National Natural Science Foundation of China (No.50401016) 摘　　要：The hydrogen-induced cracking (HIC) behavior of X80 pipeline steel was studied by means of electrochemical charging, hydrogen permeation tests, tension test, and scanning electron microscopy (SEM). The experimental results indicate that the increase of charging time and charging current density or the decrease of the solution pH value leads to an increase of the hydrogen content in X80 steel, which plays a key role in the initiation and propagation of HIC. It is found that the majority of macro-inclusions within the as-used X80 steel do not constitute a direct threat to HIC except aluminum oxides, which directly or indirectly lead to HIC. The hydrogen trap density at room temperature is estimated to be pretty high, and this is an essential reason why the steel is sensitive to HIC. After hydrogen charging, the elongation loss rate and area reduction of X80 steel decline obviously, taking a noticeable sign of hydrogen-induced plasticity damages. It is demonstrated that the losses of these plastic parameters have a linear relation to the fracture size due to hydrogen. 关键词：X80管线钢氢致开裂扫描电子显微镜 X80钢充电时间 HIC 渗透试验拉伸试验

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Hydrogen induced cracking of X80 pipeline steel

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