理化检验-物理分册2026，Vol.62Issue(8)：82-86,5.DOI:10.11973/lhjy-wl260208
核电厂汽轮机压盖螺栓断裂原因
Reasons for the fracture of turbine gland bolts in nuclear power plants
李心刚 1王力 2郭凯 1高腾飞 1陈文浩2
作者信息
- 1. 大亚湾核电运营管理有限责任公司,深圳 518124
- 2. 苏州热工研究院有限公司,苏州 215000
- 折叠
摘要
Abstract
The turbine gland bolt made of 300M steel fractured after 6 months of service in a nuclear power plant.The causes of bolt fracture were analyzed using macroscopic observation,chemical composition analysis,mechanical property testing,metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that the bolt underwent hydrogen-induced delayed fracture,and the fracture located at the transition fillet between the hexagonal head and the shank.The crack initiation region exhibited intergranular fracture features,accompanied by chicken claw-like cracks and secondary cracks,indicated hydrogen embrittlement characteristics.The stress concentration caused by the transition fillet and the surface hole defects of the material induced crack initiation and propagation.The residual hydrogen element content around the fracture surface was relatively high,and hydrogen elements enrichment and diffusion toward the high stress concentration area,accelerated the crack propagation rate and ultimately caused brittle fracture of the bolt.关键词
压盖螺栓/300M钢/氢致延迟断裂/孔洞/应力集中Key words
gland bolt/300M steel/hydrogen-induced delayed fracture/hole/stress concentration分类
通用工业技术引用本文复制引用
李心刚,王力,郭凯,高腾飞,陈文浩..核电厂汽轮机压盖螺栓断裂原因[J].理化检验-物理分册,2026,62(8):82-86,5.
