研究了不同化学成分的球墨铸铁的冲击韧性,试样在加工前经720℃退火或900与720℃的两阶段退火。试验了不同温度下,含碳、硅和磷量对球铁无缺口试样冲击韧性的影响。试验结果还表明:合金元素降低球墨铸铁在-70℃下的冲击韧性,其从大到小的顺序是,铬、镍、铜、钼。 The impact toughness of ductile iron with different chemical compositions was studied. The samples were annealed at 720 ℃ or two-stage annealed at 900 and 720 ℃ before processing. The effects of different carbon, silicon and phosphorus contents on the ductility of ductile iron ductile samples at different temperatures were tested. The experimental results also show that alloying elements reduce the ductile ductile iron impact toughness at -70 ℃, in descending order of chromium, nickel, copper and molybdenum.