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| Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite |
| Ming-ming Wang 1, Xiu-hua Gao 1, Li-ying Song 1, Cheng-lin Zhu 1, Lin-xiu Du 1, Raja Devesh Kumar Misra 2 |
| 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 |
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Abstract 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 cm2/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 2068 Ω cm2, respectively. Increased fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.
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Ming-ming Wang,Xiu-hua Gao,Li-ying Song, et al. Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite[J]. Journal of Iron and Steel Research International, 2022, 29(10): 1683-1693.
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2022, Vol. 29 
