本文研究了碳当量、硫量及混合稀土加入量对灰铸铁凝固和组织的影响.测得和分析了各种铸铁的冷却曲线,并论述了其温度特征值与组织的关系.确定了碳当量、硫量和混合稀土加入量的合适配合,以期获得细小共晶团和A型石墨的灰铸铁.探讨了稀土金属对灰铸铁孕育作用的机理. In this paper, the effects of carbon equivalent, sulfur content and mixed rare earth addition on the solidification and microstructure of gray cast iron were investigated.The cooling curves of various cast irons were measured and analyzed, and their relationship between temperature eigenvalues ​​and microstructure was discussed.The carbon equivalent , The amount of sulfur and the amount of rare earth mixed with the hope to obtain a small eutectic and graphite A gray cast iron.The mechanism of rare earth metal inoculation of gray cast iron was discussed.