摘要
研究了恒位移静加载条件下,X70管线钢的裂纹扩展行为。结果表明,在近中性pH溶液中,恒位移加载情况下,不论是在自腐蚀电位还是外加阴极电位条件下,随时间的延长,X70钢裂纹并未扩展,其应力腐蚀断裂韧度值KISCC接近于断裂韧度KIC。X70管线钢具有高的韧性,动载荷对于其应力腐蚀裂纹的扩展起重要作用。
Crack propagation behaviour of X-70 pipeline steel under static loading with constant displacement was studied. The results showed that cracks of X-70 pipeline steel under static loading with constant displacement in near-neutral pH solution did not propagate within a long duration of loading, no matter at free corrosion potential or at applied cathodic potentials. The threshold value of stress corrosion fracture toughness K(ISCC) was approximate to fracture toughness K(IC). With the feature of high toughness, dynamic loading plays an important role in the propagation of stress corrosion cracks in X70 pipeline steel.
出处
《腐蚀与防护》
CAS
2004年第12期510-512,共3页
Corrosion & Protection
基金
国家重点基础研究专项经费资助项目(G19990650)
上海市科技发展基金项目(025258036)
上海市自然科学基金项目(02ZE14031)
关键词
管线钢
近中性pH
韧性
动载荷
扩展
Pipeline steel
Near-neutral pH
Toughness
Dynamic loading
Propagation
