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Citation: YUAN Wei, HUANG Feng, LIU Jing, DONG Yangyang. Study on Hydrogen Induced Cracking of X120 Pipeline Steel by Electrochemical Methods[J]. Chinese Journal of Applied Chemistry, ;2012, 29(9): 1065-1069. doi: 10.3724/SP.J.1095.2012.00465 shu

Study on Hydrogen Induced Cracking of X120 Pipeline Steel by Electrochemical Methods

1.
School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Corresponding author: HUANG Feng,
Received Date: 21 October 2011
Available Online: 9 January 2012
Fund Project: 国家自然科学基金面上项目资助(50871077) (50871077)湖北省教育厅中青年人才项目(Q20121101) (Q20121101)

The electrochemical hydrogen permeation dynamic behavior of X120 pipeline steel was investigated by Davanathan-Stachursky dual cell system.Electrochemical hydrogen charging method was used for prefabricating micro-cracks,and scanning electron microscope(SEM) was employed to observe inclusions and hydrogen induced cracking in X120 pipeline steel.The results demonstrate that the saturated anode current I_∞,hydrogen flux J_∞ and hydrogen effective diffusion coefficient D_eff increase with the increase of charging current density.The effect of inclusions in the steel on the crack initiation depends on their chemical compositions.There are three kinds of inclusions,such as Al/Mn contained sulfide/oxide,Ti/Nb contained nitride complex and Ca-Al-O-S mixed inclusions in the experimental X120 pipeline steel.Hydrogen induced cracking is initiated easily at the sites of Al/Mn contained inclusions,the cracks nucleate and then grow along with the rolling direction.
- X120 pipeline steel,
- hydrogen permeation dynamics,
- hydrogen induced cracking,
- inclusions
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