研究了不同脉宽的电脉冲(ECP)处理对亚共晶铁碳合金中石墨的影响。结果表明,ECP处理能使石墨分布更加均匀、细小,石墨的形核率增加。随着ECP处理脉宽的增大,石墨的形核率进一步增加,石墨也随之细化。分析表明,ECP处理可以增加石墨的形核位置,降低碳原子在奥氏体中的扩散激活能和形核势垒,并缩短石墨的形核孕育期,从而提高了石墨的形核率。 The effects of different pulse width electrical pulse (ECP) treatments on graphite in hypoeutectic iron-carbon alloys were investigated. The results show that ECP treatment can make graphite distribution more uniform and smaller, and the nucleation rate of graphite increases. With the increase of ECP processing pulse width, the nucleation rate of graphite further increases and graphite is also refined. The analysis shows that ECP can increase the nucleation position of graphite, decrease the diffusion activation energy and nucleation barrier of carbon atoms in austenite and shorten the period of nucleation of graphite, thus improving the nucleation rate of graphite.