镁蠕墨铸铁高的铁素体化的倾向导致其强度和耐磨性降低,这就限制了这种材料的应用范围。为了探求控制蠕墨铸铁性能的方法,研究了它的金属基体的形成规律。用镁球铁回炉料和碳钢组成的炉料重熔制得的铸铁含有C2.8～3.2％,Si2.2～2.4％,Mn0.5～0.7％,S≤0.61％,P≤0.08％,用90％的铁硅镁合金-2(含Mg6％)和10％的含铈混合稀土合金(—2)的混合物在浇包中和型内处理铁水,将处理结果进行比较。用壁厚5、35毫米的阶梯试样进行金相研究。用少量的变质剂(0.4、0.6％)处理铁水时,在组织中出现大于85％的蠕虫状石墨,而变质剂增加到0.8％时, The high ferritization of magnesium vermicular cast iron leads to a decrease in its strength and wear resistance, which limits the range of applications of this material. In order to explore the method of controlling the performance of vermicular graphite iron, the formation of its metal matrix was studied. Iron cast iron with magnesia ductile iron and carbon steel remelted cast iron containing C2.8 ~ 3.2%, Si2.2 ~ 2.4%, Mn0.5 ~ 0.7%, S≤0.61%, P≤0.08% The results of the treatments were compared in a ladle neutralizing type with a mixture of 90% FeSi2 (containing Mg6%) and 10% cerium-containing misch metal (-2). Metallographic studies were conducted on stepped specimens with a wall thickness of 5 and 35 mm. With a small amount of modifier (0.4, 0.6%) treatment of hot metal, the occurrence of more than 85% worm-like graphite in the organization, and the modifier increased to 0.8%