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《Materials for Mechanical Engineering》 2009-04
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SCC Propagation Behaviour of X70 Pipeline Steel under Cyclic Loading in Near-neutral Solution

GUO Hao1,LIU Yu-gao1,LI Guang-fu2,YANG Wu2(1.Qingdao Agricultural University,Qingdao 266109,China;2.Shanghai Research Institute of Materials,Shanghai 200437,China)  
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.
【Fund】: 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)
【CateGory Index】: TG142.15
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1 GUO Hao, LI Guangfu CAI Xun YANG Wu College of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030 Shanghai Research Institute of Materials, Shanghai 200437;STRESS CORROSION CRACKING BEHAVIOR OF X70 PIPELINE STEEL IN NEAR-NEUTRAL pH SOLUTIONS AT DIFFERENT TEMPERATURES[J];Acta Metallrugica Sinica;2004-09
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