Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite  

作　　者：Ming-ming Wang Xiu-hua Gao Li-ying Song Cheng-lin Zhu Lin-xiu Du Raja Devesh Kumar Misra 

机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,110819,Liaoning,China [2]Laboratory for Excellence in Advanced Steel Research,Department of Metallurgical,Materials and Biomedical Engineering,University of Texas at El Paso,El Paso,TX,79968,USA

出　　处：《Journal of Iron and Steel Research International》2022年第10期1683-1693,共11页

基　　金：This study is financially supported by the National High Technology Research and Development Program of China(863 Program)(Grant No.2015AA03A501).

摘　　要：Hydrogen trapping behavior of V–N microalloyed X80 pipeline steels was studied by means of hydrogen permeation and hydrogen induced cracking(HIC)tests.In addition,the electrochemical performance of the steels in 3.5 wt.%NaCl solution was investigated.Results indicated that the microstructure of experimental steels mainly consisted of acicular ferrite and polygonal ferrite(PF).When the fraction of PF was 9.1%and 30.4%,hydrogen effective diffusion coefficient was 1.624×10^(−6) and 3.121×10^(−6) cm^(2)/s,respectively.The pipeline steels were not susceptible to HIC.Numerous potential hydrogen traps distributed in homogeneous dispersion were conducive to high HIC resistance.With increasing the fraction of PF from 9.1%to 30.4%,the corrosion current density increased from 5.39×10^(−6) to 9.49×10^(−6) A cm^(−2),the corrosion potential decreased from−0.48 to−0.57 V,and the charge transfer resistance decreased from 2301 to 2068Ωcm^(2),respectively.Increased fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.

关 键 词：Pipeline steel V-N microalloying Hydrogen induced cracking susceptibility Hydrogen permeation Electrochemical corrosion 

分 类 号：O646[理学—物理化学]