摘要
针对某电厂高压调整门弹簧的断裂失效故障,对断裂弹簧进行了宏观分析、材质分析、硬度试验、金相试验、脱碳层测量和断口微观形貌分析,结果表明弹簧折弯的结构、运行产生位移和振动是导致弹簧断裂失效的直接原因,属于疲劳断裂。通过硬度试验和材质分析,表明材料碳量高于标准要求,回火温度低导致材料硬度高于标准,使得材料韧性降低脆性增加,利于初期裂纹的萌生和扩展,是弹簧失效的主要原因。
In view of the fracture failure of the high-pressure regulating door spring in a power plant,the macroscopic analysis,material analysis,hardness test,metallographic test,decarburization layer measurement and fracture micro morphology analysis are carried out for the fracture spring.The results show that it belongs to fatigue fracture,and the displacement and vibration caused by bending structure and operation of spring are the direct causes of fracture failure of spring.The main reason of spring failure is that the carbon content of the material is higher than the standard and the hardness is higher than the standard,which makes the toughness of the material decrease and the brittleness increase,which is conducive to the initiation and propagation of the initial crack.The tempering microstructure of low carbon SiMn material at 350℃ ~500℃cannot judge whether the tempering temperature meets the process requirements.
作者
敬尚前
康永胜
董国振
李文彬
李国维
王勇
徐雪霞
JING Shangqian;KANG Yongsheng;DONG Guozhen;LI Wenbin;LI Guowei;WANG Yong;XU Xuexia(State Grid Hebei Energy Technology Service Co.,Ltd.,Shijiazhuang 050021,China;Hebei Xibaipo Power Generation Co.,Ltd.,Shijiazhuang 050400,China)
出处
《河北电力技术》
2020年第5期59-62,共4页
Hebei Electric Power
关键词
弹簧钢
断裂失效
材质分析
硬度
金相
微观形貌
回火托氏体
spring steel
fracture failure
material analysis
hardness
metallography
micromorphology
tempered tortuella
