节流阀阀套断裂失效分析

Renyong ZHANG,Hui CHAI,Daiyan SHI,Fang JIANG,Tianlei LI,Yongbin CHEN,Xiaoyan CAO

Physical Testing and Chemical Analysis Part A:Physical Testing（2017）

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Abstract

国外某气田单井的井口节流阀阀套在运行10 d(天)左右后便发生了断裂失效.为了研究阀套的失效原因,对其宏观形貌、化学成分、显微组织、硬度和断口形貌等方面进行了分析.结果表明:阀套主要呈脆性断裂特征,表现形式为沿晶断裂,断裂与环向应力和轴向应力相关;裂纹从阀套外表面的点蚀坑底部萌生,沿壁厚方向扩展,阀套在受到较大的环向应力时发生应力腐蚀开裂.

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