X60管线钢腐蚀疲劳裂纹扩展特性  

Characteristics of Corrosion Fatigue Crack Propagation of X60 Pipeline Steel

作　　者：张国军[1] 潘治国[1] 段占军[1] 王荣[1] 

机构地区：[1]辽河油田油建一公司金属公司,辽宁省盘山县124120

出　　处：《石油化工腐蚀与防护》2001年第1期53-56,共4页Corrosion & Protection In Petrochemical Industry

摘　　要：研究了不同腐蚀介质中及加载频率下X6 0管线钢的腐蚀疲劳裂纹扩展特性。在较高的加载频率f=10HZ时 ,不同腐蚀介质中裂纹扩展具有真腐蚀疲劳特性 ,并且裂纹的扩展规律可表示为 (da/dN) cf=Bcf(△K-△Kthcf) 2 。腐蚀介质主要影响腐蚀疲劳裂纹扩展门槛值△Kthcf,而对系数Bcf无显著影响 ;在较低的加载频率f=1HZ时裂纹扩展呈缓慢增加的平台———具有应力腐蚀特性。文章对建立较为通用的腐蚀疲劳裂纹扩展公式进行了探讨。The characteristics of corrosion fatigue crack propagation of X60 pipe steel at different loading frequencies and in different corrosion media were studied. At a higher loading frequency f=10 Hz, the crack propagation in different media demonstrated true corrosion fatigue characteristics and the crack propagation could be expressed by the equation (da/dN)cf=Bcf(ΔK-ΔKthcf)2. The corrosion media mainly affected the threshold value of corrosion fatigue crack propagationΔKthcf and had no marked effect on coefficient Bcf. At a lower loading frequency F=1Hz, the crack propagation increased gradually and showed stress corrosion characteristics. The establishment of a common equation for the corrosion fatigue was explored.

关 键 词：油气管道 腐蚀疲劳 裂纹扩展规律 数学模型 

分 类 号：U177[交通运输工程]