理化检验-物理分册2026，Vol.62Issue(8)：50-53,76,5.DOI:10.11973/lhjy-wl260185
某核电厂装卸料机气管卷筒发条弹簧断裂原因
Reasons for the fracture of the winding spring of the gas tube drum of a loading and unloading machine in a nuclear power plant
刘君 1徐科 2聂振华 3王坤3
作者信息
- 1. 中核运维技术有限公司,杭州 311215
- 2. 中核核电运行管理有限公司,嘉兴 314000
- 3. 苏州热工研究院有限公司,苏州 215004
- 折叠
摘要
Abstract
The winding spring of the gas tube drum of a loading and unloading machine in a nuclear power plant broke during the unloading process of the unit during major maintenance.The cause of spring fracture was analyzed using macroscopic observation,chemical composition analysis,metallographic examination,hardness testing and scanning electron microscopy analysis.The results show that the local annealing process temperature at the inner end of the spring was too high,which caused the microstructure to transform into lamellar pearlite+intermittent network ferrite,while also producing severe surface decarburization,low carbon content,significant decrease in hardness,and significant deterioration of mechanical properties of the material.There was stress concentration at the bending angle of the inner hook of the spring.When the working stress exceeded the material bearing limit in this area,a ductile brittle mixed fracture mainly characterized by ductile fracture occurred at this location.关键词
发条弹簧/60Si2MnA钢/退火工艺/脱碳/韧性断裂Key words
winding spring/60Si2MnA steel/annealing process/decarbonization/ductile fracture分类
通用工业技术引用本文复制引用
刘君,徐科,聂振华,王坤..某核电厂装卸料机气管卷筒发条弹簧断裂原因[J].理化检验-物理分册,2026,62(8):50-53,76,5.
