摘要
导线熔痕类型的判断对火调人员在认定火灾原因方面具有很大的依据和指导作用。由于火灾现场环境复杂,铝导线在形成短路熔痕后依然受到火灾现场高温的影响,其内部金相组织也会发生改变。通过模拟火灾现场环境制备铝导线二次短路熔痕,对其金相组织特征进行观察分析,并且使用高温金相显微镜对铝导线二次短路熔痕进行升温观察。结果表明:不同电流下铝导线熔痕金相组织具有差异性,当温度在500~600℃时,铝导线二次短路熔痕内部晶粒会变大,部分气孔缩小甚至消失。
The judgment of the type of wire melt marks provide a basis and guidance for the fire investigation personnel in determining the cause of the fire.Due to the complex environment of the fire scene,the aluminum wire will be affected by the high temperature of the fire site after the formation of the short circuit melt marks,and the internal metallographic structure will also change.The secondary short circuit melting marks of aluminum wires were prepared by simulating the fire scene environment,and the metallographic characteristics were observed and analyzed.The high temperature metallographic microscope was used to observe the increased temperature of the secondary short circuit melt marks of aluminum wire.The results show that the metallographic structure of aluminum wire melt marks is different under different currents.When the temperature is between 500℃and 600℃,the inner grain of the secondary shortcircuit melt marks of the aluminum wire will become larger,and some of the pores will shrink or even disappear.
作者
孟威
MENG Wei(China People’s Police University,Langfang,Hebei Province 065000,China)
出处
《武警学院学报》
2019年第8期19-23,共5页
Journal of the Armed Police Academy
关键词
铝导线
二次短路
金相分析
高温金相
显微组织
aluminum wire
secondary short circuit
metallographic analysis
high temperature metallography
microstructure
