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| Electrochemical investigation of hydrogen induced cracking behaviors of X70 pipeline steel and welds |
| Yingrui Zhang |
| 北京科技大学材料学院腐蚀与防护中心 |
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Cite this article:
Yingrui Zhang. Electrochemical investigation of hydrogen induced cracking behaviors of X70 pipeline steel and welds. Acta Metall Sin, 2006, 42(5): 521-527 .
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Abstract In this paper, the hydrogen induced cracking (HIC) of X70 pipeline steel was studied in different concentrations of H2SO4 solution by means of electrochemical charging. Larger current densities, longer charging time and lower pH values of solution would promote the entry of hydrogen into X70 steel. Non-metallic inclusions such as nitrides and oxides play different roles in HIC of X70 steel. Microscopic observation shows that there is no dependency relation between cracks induced by hydrogen and the inclusions of titanium nitrides. Otherwise, oxides of magnesium aluminum and calcium etc are more harmful as the sources of hydrogen induced cracks. According to the results of hydrogen permeation test, the effective diffusivity (Deff) of hydrogen at room temperature is 3.34×10-9cm2/s. Tensile specimens of X70 steel and welds shows severe plasticity loss after hydrogen charging. The plasticity of welds is not as good as X70 base metal.
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Received: 08 August 2005
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[1] Wang S H, Luu W C, Ho K F, Wu J K. Mater Chem Phys, 2002; 77: 447
[2] Lin X M. Nat Gas Oil, 2001; 19(2): 32 (林雪梅．天然气与石油,2001;19(2):32)
[3] Mi Q Z. Welded Pipe Tube, 2000; 23(6): 16 (米秋占．焊管,2000;23(6):16)
[4] Li Y T, Du Z Y, Tao Y Y, Xiong L Y. Trans Chin Weld Inst, 2003; 24(3): 76 (李云涛,杜则裕,陶勇寅,熊林玉．焊接学报,2003:24(3): 76)
[5] Lunarska E, Ososkov Y, Jagodzinsky Y. Int J Hydrogen Energy, 1997; 22 : 279
[6] Kumkum B, Chatterjee U K. Scr Mater, 2001; 44: 213
[7] Chattoraj I, Tiwari S B, Ray A K, Mitra A, Das S K. Corros Sci, 1995; 37: 885
[8] Li Y T, Du Z Y, Tao Y Y, Xiong L Y. Trans Chin Weld Inst, 2004; 25(5): 104 (李云涛,杜则裕,陶勇寅,熊林玉．焊接学报,2004;25(5): 104)
[9] Li H L, Feng Y R, Huo C Y, Ma Q R. Chin Metall, 2003; 13(4): 36 (李鹤林,冯耀荣,霍春勇,马秋荣．中国冶金,2003;13(4): 36)
[10] Li H L. Chin Mech Eng, 2001; 12: 349 (李鹤林．中国机械工程,2001;12:349)
[11] Wang C M, Wu X F. Angang Technol, 2004; (5): 21 (王春明,吴杏芳．鞍钢技术,2004;(5):21)
[12] Chu W Y. Hydrogen Attack and Delayed Fracture. Beijing: Metallurgical Industry Press, 1988: 190, 255 (褚武扬．氢损伤与滞后断裂．北京:冶金工业出版社,1988: 190,255)
[13] Kim W K, Koh S U, Kim K Y. In: Chinese Society for Corrosion and Protection ed., Proc 16th Int Corros Congress. Beijing, 2005: 10-H-21
[14] Yen S K, Huang I B. Corrosion, 2003; 59: 995
[15] Yen S K, Huang I B. Mater Chem Phys, 2003; 80: 662
[16] Chu W Y, Qiao L J, Chen Q Z, Gao K W. Fracture and Environmental Fracture. Beijing: Science Press, 2000: 100 (褚武扬,乔利杰,陈奇志,高克玮．断裂与环境断裂．北京: 科学出版社,2000:100)3 |
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