钇基重稀土复合蠕化剂对蠕墨铸铁组织及石墨形态影响的实验研究

The Experimental Research of the Influence of Yttrium-Based Heavy Rare Earth Compound Vermicularizing Alloy to Organization and Graphite Morphology of Vermicular Cast Iron

摘要: 本实验以钇基重稀土复合蠕化剂为研究对象，研究其对蠕墨铸铁组织及石墨形态的影响。实验结果表明，以稀土硅铁镁合金与钇基重稀土组成复合蠕化剂得到的蠕墨铸铁的组织形态是珠光体与铁素体的混合结构；当稀土硅铁镁合金加入量不变时，随着钇基重稀土含量的增加，石墨团的体积都有变小的趋势，而且分布数量减少。当稀土硅铁镁合金含量由0.14%提高到0.18%时，钇基重稀土抑制石墨球化的作用逐渐加强。因此采用钇基重稀土可以起抑制石墨球化的作用。

Abstract: This experiment is based on yttrium-based heavy rare earth compound vermicularizing alloy, the influence of yttrium-based heavy rare earth compound vermicularizing alloy on organization and graphite morphology of vermicular cast iron is studied. The experimental results show that the microstructure of vermicular cast iron with rare earth ferrosilicon alloy and yttrium-based heavy rare earth is the mixture structure of pearlite and ferrite. When the amount of rare-earth ferrosil-icon magnesium alloy addition remains the same, the volume of graphite ball has smaller trends, and decreased in the number and distribution along with the increase of the content of yttri-um-based heavy rare earth. When the content of rare-earth ferrosilicon magnesium is from 0.14% to 0.18%, the action of yttrium-based heavy rare earth to inhibit the graphite spheroidizing has gradually strengthened. Therefore, the use of yttrium-based heavy rare earth can inhibit the spherification of graphite.