循环载荷作用下X70管线钢在近中性溶液中应力腐蚀裂纹的扩展行为
SCC Propagation Behaviour of X70 Pipeline Steel under Cyclic Loading in Near-neutral Solution
摘 要
研究了在循环载荷作用下V形和线形缺口X70管线钢试样在近中性溶液中的应力腐蚀裂纹的扩展行为.结果表明:线形缺口比V形缺口更容易使裂纹扩展,其原因是线形缺口试样的应力集中系数大于V形缺口试样的,且裂纹扩展速度随应力比的降低而增加;在裂纹扩展初期,环境是主要的影响因素,随着裂纹扩展的不断进行,力学作用逐渐增强,当应力强度因子幅ΔK达到某一值时,裂纹由稳定扩展转变为不稳定的快速扩展.
循环载荷
缺口
应力集中系数
裂纹扩展
X70 pipeline steel
cyclic loading
notch
stress concentration factor
crack propagation
Abstract
SCC propagation behavior of X70 pipeline steel specimens with V-shape and linear shape notches under cyclic loading in near-neutral solution was studied. The results show that linear shape notch made the cracks propagate easier than V-shape notch because the stress concentration factor of linear shape notch specimen was larger than that of V-shape notch specimen. And the crack propagation rate increased with the decrease of stress ratio. The environment was dominant affecting foctor of crack propagation at the beginning,and the mechanical role was enhanced gradually with the continuous propagation of cracks. When stress intensity factor amplitude ΔK reached a certain value,the propagation of cracks transferred from a stable stage to an unstable quick period.
中图分类号 TG172.8
所属栏目 试验研究
基金项目 国家重点基础研究专项经费资助项目(G19990650);青岛农业大学博士启动基金资助项目(630509)
收稿日期 2008/4/28
修改稿日期 2008/12/8
网络出版日期
作者单位点击查看
备注郭浩(1971-),男,山东青岛人,副教授,博士.
引用该论文: GUO Hao,LIU Yu-gao,LI Guang-fu,YANG Wu. SCC Propagation Behaviour of X70 Pipeline Steel under Cyclic Loading in Near-neutral Solution[J]. Materials for mechancial engineering, 2009, 33(4): 39～42
郭浩,刘玉高,李光福,杨武. 循环载荷作用下X70管线钢在近中性溶液中应力腐蚀裂纹的扩展行为[J]. 机械工程材料, 2009, 33(4): 39～42
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参考文献
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【3】CHEN W,KING F,VOKES E. Characteristics of near neutral pH stress corrosion cracks in an X65 pipeline[J].Corrosion,2002,58(3):267-275.
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【5】DELANTY B,OBEIRNE J. Major field study compares pipeline SCC with coatings[J].Oil & Gas Journal,1992,15(6):39-44.
【6】PARKINS R N,BLANCHARD J W K,DELANTY B S. Transgranular stress corrosion cracking of high-pressure pipelines in contact with solutions of near neutral pH[J].Corrosion,1994,50(5):394-408.
【7】CHEN W X,WANG S H,KING F,et al. Hydrogen permeation behavior of X-70 pipeline steel in a near-neutral pH soil environment[C]//2000 International Pipeline Conference-Volume 2. Calgary,Alberta,Canada: ASME,2000:953-960.
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【9】郭浩,李光福,蔡洵,等.X-70管线钢在不同温度近中性pH溶液中的应力腐蚀破裂行为[J].金属学报,2004,40(9):967-971.
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【11】刘宝琛.实验断裂、损伤力学测试技术[M].北京:机械工业出版社,1994:298.
【2】YUNOVICH M,XIA Z,SZKLARSKA-SMIALOWSKA Z. Factors influencing stress corrosion cracking of carbon steel in diluted bicarbonate environments[J].Corrosion,1998,54(2):155-161.
【3】CHEN W,KING F,VOKES E. Characteristics of near neutral pH stress corrosion cracks in an X65 pipeline[J].Corrosion,2002,58(3):267-275.
【4】GU B,YU W Z,LUO J L,et al. Transgranular stress corrosion cracking of X-80 and X-52 pipeline steels in dilute aqueous solution with near-neutral pH[J].Corrosion,1999,55(3):312-319.
【5】DELANTY B,OBEIRNE J. Major field study compares pipeline SCC with coatings[J].Oil & Gas Journal,1992,15(6):39-44.
【6】PARKINS R N,BLANCHARD J W K,DELANTY B S. Transgranular stress corrosion cracking of high-pressure pipelines in contact with solutions of near neutral pH[J].Corrosion,1994,50(5):394-408.
【7】CHEN W X,WANG S H,KING F,et al. Hydrogen permeation behavior of X-70 pipeline steel in a near-neutral pH soil environment[C]//2000 International Pipeline Conference-Volume 2. Calgary,Alberta,Canada: ASME,2000:953-960.
【8】LU B T,LUO J L,MCCRADY B. Near-neutral pH SCC initiation and early propagation of X70 pipeline steel[C]//Proceedings of IPC′02 (4th international pipeline conference). Calgary,Alberta,Canada: ASME,2002.
【9】郭浩,李光福,蔡洵,等.X-70管线钢在不同温度近中性pH溶液中的应力腐蚀破裂行为[J].金属学报,2004,40(9):967-971.
【10】西田正考.应力集中[M].李安定,郭廷玮,张诚文,等译.北京:机械工业出版社,1986:40.
【11】刘宝琛.实验断裂、损伤力学测试技术[M].北京:机械工业出版社,1994:298.
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