薄壁球墨铸铁白口组织的形成及影响石墨化的因素
Formation of Chill Microstructure and Influencing Factors of Graphitization in Thin-wall Ductile Cast Iron
马晓丽， 雷富军， 王 珊
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作者单位：青海大学 机械工程学院，青海 西宁 810016
中文关键字： 薄壁；球墨铸铁；白口组织；石墨化
英文关键字：thin-wall; ductile cast iron；chill microstructure；graphitization
中文摘要： 简述了薄壁球墨铸铁容易产生白口组织的原因，抑制白口组织的生成应促进石墨化、增加石墨球数。介绍了化学成分C、Si、S、Mn、稀土元素及球化、孕育处理对石墨化的影响。应通过严格控制铁液成分、加强孕育并适当添加稀土元素，促使铁液充分石墨化，增加石墨球数来有效抑制白口生成。
英文摘要：It is described the reasons of chilling microstructure is easy to produce in the thin-wall ductile cast iron; in order to suppress the microstructure, the graphitization should be promoted and the amount of spherical graphite should be increased. Then the effects of chemical composition of C, Si, S, Mn, rare earth elements and spheroidization-inoculation on graphitization are introduced. To effectively restrain chill microstructure generation, graphitization should be prompted and the number of spherical graphite is increased by strictly controlling the composition of melting iron, strengthening inoculation and addinng appropriate RE.