Φ815mm法兰盘断裂失效分析  

Failure Analysis on Fracture of Φ815 mm Flange

作　　者：张铁军[1] 陈明铭[1,2] 刘亮[1,2,3] 涂铭旌[1,2] 

机构地区：[1]重庆文理学院新材料技术研究院,重庆永川402160 [2]重庆理工大学材料科学与工程学院,重庆400050 [3]重庆新泰机械有限责任公司,重庆402160

出　　处：《热加工工艺》2017年第3期258-260,共3页Hot Working Technology

基　　金：重庆文理学院科研项目(R2012RCJ19);重庆市永川区科技基金资助项目(Ycstc;2015ac4002;2013nc8005)

摘　　要：法兰盘是石油井口设备中的关键零件。根据准815mm法兰盘的工况,采用力学性能检测、显微组织和断口分析等方法对其断裂失效的原因进行了分析。结果表明:由于法兰盘组织中存在混晶,降低其力学性能;同时,由于热加工工艺不当,使热应力在厚大部位依次累积增大超过其热强度而产生微裂纹,在加压试验时,应力诱发引起裂纹快速扩展,沿径向从中间向两边扩展而断裂失效。Flange is a key part in oil wellhead equipment. According to the working condition of the Ф815 mm flange, the reason for fi-aeture failure was analyzed by mechanical properties testing, microstrueture and fracture analysis. The results show that due to the existence of mixed crystals in the flange plate, its mechanical properties are reduced; at the same time, due to improper heat treatment process, thermal stress is accumulated in thick and large parts, and magnified, micro-cracks produce after exceeding the thermal strength. During the pressure test, the stress induces crack fast propagation extending along the radial direction from the center to the two sides which couses fracture failure.

关 键 词：法兰盘 失效分析 试压 断裂 

分 类 号：TG111.91[金属学及工艺—物理冶金]