电流值改变使铜包钢导线短路熔痕金相组织发生改变。模拟火场中导线短路熔痕的产生条件,设定不同的电流值制备铜包钢导线一次短路熔痕和二次短路熔痕。结果表明:随着电流的增加,一次短路熔痕金相组织中气孔体积增大,板条状马氏体数量减少,无碳化物贝氏体数量增加;随着电流的增加,二次短路熔痕金相组织中气孔体积增大,无碳化物贝氏体数量在减少,珠光体数量增加。 Changes in current value of the copper clad steel wire short-circuit melt microstructure changes. Simulate the conditions of the conductor short circuit in the fire, and set different current values ​​to prepare the copper clad steel wire once short-circuit and second short-circuit melt marks. The results show that with the increase of current, the pore volume increases, the number of lath martensite decreases and the number of carbides without bainite increases with the increase of current, Stomatal organization increased the stomatal volume, the number of carbide-free bainite decreased, the amount of pearlite increased.