通过一体化高温炉、光学显微镜和IPP图像分析软件等工具, 研究了某截面尺寸为4 mm2的多股铜导线在不同受热环境下的晶粒尺寸变化及分布规律。结果表明: 加热温度、加热时间以及冷却方式对多股铜导线的晶粒面积及分布情况均有不同程度的影响, 且呈现一定的量化规律；通过对受热多股铜导线进行金相定量分析, 可以为火灾物证鉴定提供一定的参考依据。

By applying heating box, metallographic microscope, the Image Pro-Plus image analysis software and other tools, the change and distribution rule of the grain area of multi-thread copper wires, which were heated under different thermal environment were studies. The results show that the grain area and its distribution were affected by the heating temperature, heating time and cooling ways in different ranges, within some rules of quantification. Through the quantitative metallography analysis of multi-thread copper wires, some references for the identification of material evidence for fire trace could be obtained.