500 kV输电线路耐张线夹钢锚断裂分析  

Analysis of Steel Anchor Fracture of Tension Strain Clamp on 500 kV Transmission Line

作　　者：徐望圣 孙志林 谢亿 陈亮平 何朋非 XU Wang-sheng;SUN Zhi-lin;XIE Yi;CHEN Liang-ping;HE Peng-fei(Guiyang Bureau,CSG EHV Power Transmission Company,Guiyang 550081,Guizhou,China;Electric Power Research Institute,State Grid Hunan Electric Power Company,Changsha 410007,Hunan,China;Hunan Xiangdian Boiler Pressure Inspection Center Co Ltd,Changsha 410004,Hunan,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司贵阳局,贵州贵阳550081 [2]国网湖南省电力公司电力科学研究院,湖南长沙410007 [3]湖南省湘电锅炉压力容器检验中心有限公司,湖南长沙410004

出　　处：《矿冶工程》2020年第2期144-146,153,共4页Mining and Metallurgical Engineering

摘　　要：采用宏观检查、化学成分分析、力学性能测试、显微组织观察等方法分析了某500 kV线路耐张线夹钢锚断裂的原因。结果表明,钢锚断裂的原因主要是压接工艺控制不当,在第一模部位产生了应力集中;钢锚压接后加工硬化效应明显,相较压接前钢锚硬度提高了72%,达到了210HB,室温冲击韧性降低了58%,为31 J,致使钢锚抵御冲击载荷能力降低,最终在应力集中部位断裂。The reasons for the steel anchor fracture of tension strain clamp on 500 kV transmission line were analyzed by using macro-morphology inspection,chemical composition analysis,mechanical properties test and microstructure observation.The results show that an improper cramping can result in stress concentrated in the first mold position.The steel anchor presents an obvious work hardening effect after cramping,with hardness increased by 72%to 210 HB.And its impact toughness at room temperature is reduced by 58%to 31 J.Consequently,the ability of steel anchor to resist fracture due to impact load is reduced,leading to the final failure in the stress concentration area.

关 键 词：输电线路 耐张线夹 钢锚 断裂 断口形貌 失效分析 Q235A 

分 类 号：TG111[金属学及工艺—物理冶金]