The research on delayed fracture behavior of high-strength bolts in steel structure

2nd International Conference on Design, Materials, and Manufacturing

材料科学;机械制造

Li, Guo Dong^1 ; Li, Nan^1

Equipment Management Department, Suzhou Nuclear Power Research Institute, Shenzhen

518000, China^1

关键词: Anti-corrosion;    Delayed fracture;    Fracture analysis;    High strength bolts;    Mechanical analysis;    Metallurgical analysis;    Pumping stations;    Stress corrosion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/220/1/012005/pdf
DOI  :  10.1088/1757-899X/220/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

High-strength bolts have been widely used in power plants. However, the high-strength bolts which being employed in pumping station, steel structure and pipeline anti-whip structure have been found delayed fracture for many times in a power plant, this will affect the reliability of steel fracture and bring blow risk caused by falling objects. The high-strength bolt with delayed fracture was carried out fracture analysis, metallurgical analysis, chemical analysis, mechanical analysis, as well as bolts installation analysis, it can be comprehensively confirmed that the direct cause of high-strength bolts delayed fracture is the stress corrosion, and the root cause of high-strength bolts delayed fracture should be the improper installation at the initial and the imperfect routine anti-corrosion maintenance.