海上油田电泵连接螺栓断裂原因  

Causes of fracture of electric pump connecting bolt in offshore oilfield

作　　者：冯电稳 何泽宇 杨中娜 杨阳 徐志刚 徐振东 高海宾 FENG Dianwen;HE Zeyu;YANG Zhongna;YANG Yang;XU Zhigang;XU Zhendong;GAO Haibin(CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,China;Tianjin Beihai Oil Human Resource Consulting Service Co.,Ltd.,Tianjin 300452,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)

机构地区：[1]中海油(天津)管道工程技术有限公司,天津300452 [2]天津北海油人力资源咨询服务有限公司,天津300452 [3]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《理化检验（物理分册）》2024年第6期51-55,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某海上油田电泵连接螺栓发生断裂现象,采用宏观观察、断口分析、化学成分分析、硬度测试、金相检验等方法分析螺栓断裂的原因。结果表明:螺栓的断裂模式为疲劳断裂,在服役过程中,螺栓根部发生点腐蚀,进而引起应力腐蚀微裂纹,在电泵振动应力的作用下,腐蚀微裂纹进一步扩展,直至螺栓断裂。The connecting bolt of electric pump in an offshore oilfield was fractured.The causes of bolt fracture were analyzed by means of macroscopic observation,fracture analysis,chemical composition analysis,hardness test and metallographic examination.The results show that the fracture mode of the bolt was fatigue fracture.During the service process,pitting corrosion occured at the root of the bolt,which in turn induced stress corrosion microcracks.Under the action of the vibration stress of the electric pump,the corrosion microcracks further expanded until the bolt broke.

关 键 词：点腐蚀 微裂纹 疲劳断裂 表面锈蚀 显微组织 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]