研究了可锻铸铁低温快速石墨化的机理认为,复合孕育处理带入的硅在铁水中形成较显著的浓度起伏,从而改善了形核条件、铸态组织和碳化物形态,加速了共晶渗碳体的分解和珠光体的粒状化,为石墨形核与生长提供了良好条件,因而是实现低温快速石墨化的关键. The mechanism of rapid graphitization of malleable cast iron at low temperature was studied. It is found that silicon introduced by composite inoculation process forms more significant concentration fluctuation in molten iron, thus improving the nucleation conditions, the as-cast microstructure and the carbide morphology, accelerating the eutectic cementite Decomposition and pearlite granulation, graphite nucleation and growth provides a good condition, and therefore is the key to achieving rapid graphitization at low temperature.