摘要
针对电网铁附件抱箍产生断裂失效,首先通过对断口微观形貌观察,初步确定断裂起源;其次通过无损检测、化学成分分析、硬度试验、金相检验等方法对电网抱箍断裂失效进行了相关检测,结果表明,随着Zn含量的增加,其应力腐蚀敏感性增大,同时在外力作用下导致抱箍在运行使用过程中,断裂面因外形尺寸发生变化而引起局部范围内应力显著增大,形成应力集中,最终导致抱箍断裂;最后结合本次失效分析提出了相关预防措施和建议。
In view of the fracture failure of the hoop of the power grid iron accessories,firstly,the fracture origin is preliminarily determined by observing the micro morphology of the fracture.Secondly,the fracture failure of the hoop of the power grid is detected by non-destructive testing,chemical composition analysis,hardness test,metallographic examination and other methods.The result shows that with the increase of Zn content,its stress corrosion sensitivity increases,and at the same time,it acts on the external force in the process of running and using the hoop,the internal stress of the fracture surface increases significantly in the local scope due to the change of the external dimension,forming the stress concentration,leading to the hoop fracture under the combined action of the above comprehensive factors.Finally,combined with the failure analysis,the relevant preventive measures and suggestions are put forward.
作者
武鑫
蒋菲
晏得才
Wu Xin;Jiang Fei;Yan Decai(Gansu Electric Power Research Institute Technology Center Co.,Ltd,Lanzhou 730070;Gansu Electric Power Research Institute,Lanzhou 730070)
出处
《电气技术》
2020年第6期88-90,94,共4页
Electrical Engineering
关键词
抱箍
开裂
铅黄铜
检验
措施
hoop
crack
lead brass
test
measures
