汽轮机机组速关阀弹簧断裂分析  

Analysis on Spring Fracture Failure of Quick-Closing Valve in a Turbine Unit

作　　者：李海霞[1] 黄亮 田宇[1] 张小伍[1] LI Haixia;HUANG Liang;TIAN Yu;ZHANG Xiaowu(Harbin Turbine Co.,Ltd.,Harbin 150046,China)

机构地区：[1]哈尔滨汽轮机厂有限责任公司,哈尔滨150046

出　　处：《热力透平》2023年第2期149-152,共4页Thermal Turbine

摘　　要：针对某电厂机组的速关阀弹簧发生断裂的事故,通过对弹簧进行宏观检查,并对其化学成分、硬度、金相显微组织、断口形貌以及断口微区成分等进行分析,确定了弹簧的断裂原因。分析结果表明,弹簧断裂的性质为腐蚀断裂,速关阀弹簧运行环境中的腐蚀介质和弹簧本身硬度较高是发生断裂的主要原因。研究成果可为同类型速关阀的故障分析提供参考。Aimed at the spring fracture failure of quick-closing valve of turbine in a power plant,the cause is verified through macroscopic inspection and analysis on its chemical composition,hardness,metallographic structure and morphology and micro components of the fracture surface.The results show that the spring fracture mechanism of quick-closing valve is corrosion cracking,and the fracture is mainly caused by the corrosive medium in the operation environment and the high hardness of spring.The research results can provide reference for analysis on similar failure of quick-closing valve.

关 键 词：速关阀 弹簧 腐蚀 硬度 

分 类 号：TG178[金属学及工艺—金属表面处理]