力学与电化学作用下X80钢焊接接头SCC行为分析

谢飞; 孙岩; 王丹; 吴明

力学与电化学作用下X80钢焊接接头SCC行为分析

辽宁石油化工大学石油天然气工程学院, 抚顺 113001

基金项目: 国家自然科学基金资助项目(50771053);辽宁省教育厅科学研究基金资助项目(L2014156);辽宁石油化工大学科学基金资助项目(2013XJJ-019)

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- 收稿日期: 2013-06-19

SCC behavior of X80 steel welded joint in mechanical and electrochemical effects

College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

摘要

摘要: 采用动电位扫描技术及慢应变速率拉伸试验(slow strain rate test, SSRT)研究了X80钢焊接接头在库尔勒模拟溶液中应力腐蚀开裂(stress corrosion cracking, SCC)行为,并利用扫描电镜(scanning electron microscope, SEM)对不同应变速率下试样断口形貌进行表征.结果表明,随着应变速率的增加,X80钢焊接接头的腐蚀速率则呈现持续增大的趋势.当应变速率为1×10^-5/s时,试样的腐蚀情况最为严重. X80钢焊接接头在不同应变速率下的腐蚀机制是由电化学-力学交互作用共同决定的.试样发生应力腐蚀后断裂于焊缝处,这是由于焊接过程导致焊缝晶格存在大量的缺陷,使得晶格活性较高所致.
- X80钢 /
- 焊接接头 /
- 电化学 /
- 应变速率 /
- 应力腐蚀开裂
Abstract: Potentiondynamic polarization curves and slow strain rate testing(SSRT) were used to study the stress corrosion cracking(SCC) behavior of welded joint for X80 pipeline steel in Ku'erle soil simulated solution. Fracture appearances at different strain rate were analyzed by SEM. The results showed that the corrosion rate of welded joint increases persistently with the increase of strain rate. When the strain rate is 1×10^-5/s, the corrosion of welded joint is the most serious. The influence of stress on electrochemical corrosion plays a decisive role of welded joint. The specimen fractures at the welded joint after SCC, which is caused by lattice defects in the welded joint.
- X80 steel /
- welded joint /
- electrochemical /
- strain rate /
- stress corrosion cracking

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参考文献(9)

[1]	Albarran J L, Aguilar A,Martinez L. Corrosion and cracking behavior in an API X80 steel exposed to sour gas environment[J]. Corrosion, 2002, 58(9):783-787.
[2]	Lu B T, Luo J L. Relationship between yield strength and near-neutral pH stress corrosion cracking resistance of pipeline steels-an effect of microstructure[J]. Corrosion, 2006, 62(2):129-138.
[3]	Chen W, King F, Vokes E. Characteristics of near-neutral pH stress corrosion cracksinan X-65 pipeline[J]. Corrosion, 2002, 58(3):267-277.
[4]	Wang J Q, Atrens A. SCC initiation for X65 pipeline steel in the high pH carbonate bicarbonate solution[J]. Corrosion Science, 2003, 45(10):2199-2217.
[5]	王炳英,霍立兴,张玉凤,等. CO₃^2--HCO₃^-溶液中X80管线钢焊接接头的应力腐蚀开裂分析[J].焊接学报, 2007, 28(7):85-88. Wang Bingying, Huo Lixing, Zhang Yufeng, et al. The SCC analysis of welded X80 pipeline steel in CO₃^2--HCO₃^- solution[J]. Transactions of the China Welding Institution, 2007, 28(7):85-88.
[6]	黄毓晖,杨博,轩福贞,等. 316L不锈钢扩散焊接头在酸性氯化钠溶液中的应力腐蚀行为[J].焊接学报, 2011, 32(7):67-70. Huang Yuhui, Yang Bo, Xuan Fuzhen, et al. Stress corrosion behavior of diffusion bonding joints of 316L stainless steel in environment of acid NaCl solution[J]. Transactions of the China Welding Institution, 2011, 32(7):67-70.
[7]	周贤良,李晖榕,华小珍,等. X80管线钢埋弧焊焊接接头的组织和腐蚀性能[J].焊接学报, 2011, 32(1):37-40. Zhou Xianliang, Li Huirong, Hua Xiaozhen, et al. Microstructures and corrosion properties of submerged arc welded joint for X80 pipeline steel[J].Transactions of the China Welding Institution, 2011, 32(1):37-40.
[8]	谢飞,吴明,陈旭,等. SO₄^2-对X80管线钢在库尔勒土壤模拟溶液中腐蚀行为的影响[J].中南大学学报(自然科学版), 2013, 44(1):424-430. Xie Fei, Wu Ming, Chen Xu, et al. Effects of SO₄^2- on corrosion behavior of X80 pipeline steel in simulated Ku'erle soil solution[J]. Journal of Central South University(Science and Technology), 2013, 44(1):424-430.
[9]	孙智,江利,应鹏展.失效分析:基础与应用[M].北京:机械工业出版社, 2010.

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力学与电化学作用下X80钢焊接接头SCC行为分析

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出版历程

SCC behavior of X80 steel welded joint in mechanical and electrochemical effects

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出版历程

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