加热时间和温度对过负荷铜导线金相组织的影响

模拟火灾现场的热环境对过负荷铜导线在不同温度下加热不同时间,冷却后得到一系列近似于火灾现场中遗留的过负荷铜导线试样。通过分析过负荷铜导线试样的金相组织,找出过负荷之后的加热温度和加热时间对其金相组织的影响。结果表明,过负荷铜导线在火灾现场继续受热时,随着受热温度的升高和时间的延长,其晶粒会进一步增大。在实际进行火灾原因判断时,为了准确反映火灾事实,应根据现场调查取证情况,结合鉴定结论进行综合分析,不断提高火灾调查工作的科学性和准确性。

Metallographic Microcosmic Characteristics Analysis on Overload Copper Wire Heated in the Fire Scene for Different Time at Different Temperature

Simulating the forming and remaining progress of overload copper wire in fire scene,the overload copper wire was heated at different time and different temperature.The metallurgical structure of the overload copper wire was observed and the effect of the temperature and the time on the metallurgical structure was obtained.The results showed that the metallurgical structure of the overload copper wires changed with the increase of the temperature and extension of the time.In order to reflect the fact of fire...