Failure Analysis of Bolts in Pumped Storage Power Station
The top bolt of pumped storage power station plays a vital role in the safe operation of the unit.The 35CrMo bolt with quenched and tempered state has been fractured in a pumped storage power station,the fracture causes of bolts were analyzed by means of metallographic microscope,scanning electron microscope and tensile test,et.al.The results showed that,the bolt has a 3mm deep fatigue crack before the last instable fracture.The large stress action and the tip stress concentration formed by the fatigue crack are the reasons for the rapid instability fracture of the bolt.The fatigue crack of the bolt begins at the root of the thread,the large stress action beyond the fatigue limit of the material and the machining defect on the thread surface are the causes of the fatigue cracking of the bolt from the root of the thread.
bolt fracture morphology fatigue crack
Lin Shuangping Zhao Lin Zhong Zhenqian Zheng Kai
Central Iron and Steel Research Institute,Beijing 100081,China;Post Doctoral Research Workstation of Central Iron and Steel Research Institute,Beijing 100081,China 714 Institute of China Shipbuliding Industry Corporation,Beijing 100097,China
国际会议
北京
英文
2063-2068
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）