摘要
在电气火灾调查过程中,火场中往往会出现白铜熔痕,为鉴别白铜熔痕类型,进而帮助判断起火原因,选择一种常见白铜,制备白铜的一次短路、二次短路、火烧熔痕,通过金相显微镜观察并对三种熔痕的金相组织进行分析总结。试验结果表明:白铜一次短路熔痕金相组织气孔多,且大多为大气孔,少部分为小气孔,晶粒为细小的树枝晶;白铜二次短路熔痕金相组织气孔较多,少于一次短路熔痕金相组织气孔,小气孔居多,晶粒为粗大的树枝晶;白铜的火烧熔痕金相组织基本无气孔,晶粒为粗大的等轴晶。
In the process of investigating electrical fires,cupronickel melting marks show up in the fire field. In order to determine the cause of the fire with different cupronickel melting marks,a study was carried out to analyze metallographic structures of primary short circuited mark,secondary short circuit mark,and melted mark caused by fire of cupronickel with the use of the metallographic microscope. The results show that,cupronickel＇s primary short circuited metallographic microstructure has many pores,and the majority of which are big,a minority of which are small,and the grains are fine dendrites. Cupronickel ＇s secondary short circuit metallographic structure has less pores than primary short-circuited metallographic structure,the majority of which are small pores,and the grains are coarse dendrites. The metallographic structure of cupronickel＇s melted marks caused by fire is essentially nonporous,and the grains are coarse equiaxed crystals.
作者
雷鹏奎
LEI Pengkui(Fire Corps of Shanxi Province,Xi＇an 710016,China)
出处
《武警学院学报》
2018年第8期89-92,共4页
Journal of the Armed Police Academy
关键词
白铜
一次短路
二次短路
火烧熔痕
金相组织
cupronickel
primary short circuit
secondary short circuit
mehed mark caused by fire
metallographic structure
