超低碳等温淬火球墨铸铁变质剂的研究.pdfVIP

学兔兔 Feb．201O 铸 造 VOI．59 NO_2 FO RY 超低碳等温淬火球墨铸铁变质剂的研究 魏笑一，’刘金海，李国禄，杨 敏，贤福超，马世杰 (河北工业大学材料学院，天津300130) 摘要：根据相关文献对变质剂中组成元素进行分类，分析了有关元素在铁液中的作用及行为，设计出四种不同成分的 变质剂，对超低碳等温淬火球墨铸铁 (ADI)进行变质处理。试验结果表明，SC变质剂变质效果最好，能够在铸态得 到圆整度好、数量少、分布均匀的细小石墨球，并且基体组织中不存在碳化物。对SC变质剂加入量进行优化，探索不 同变质剂含量对超低碳ADI的石墨球数、石墨球大小以及基体组织的影响。但是，SC变质剂加入量的改变，对石墨球 数和石墨球大小的影响并不明显。 关键词：超低碳ADI；SC变质剂；石墨球 中图分类号：TG255 文献标识码：A 文章编号：1001—4977(2010)02—0141—04 Research on Modifiers of Ultra-Low Carbon Austempered Ductile Iron WEI Xiao—yi，LIU Jin—haj，LI Guo-lu，YANG Min，XIAN Fu—chao，MA Shi-jie (Department of Material，Hebei University of Technology，Tianjin 3001 30，China) Abstract：Based on relevant Iiteratures。the components in the nodulizer are classified，and their role and behavior in the molten iron has been analyzed．Four kinds of modifiers with different components are designed for modifying of the ultra．1ow carbon ductile iron．The experiment results show that the SC modifier has the most excellent effect：a smalI amount of uniformly distributed roundness．refined nodular graphites are obtained in as—cast state and no carbide exists in the matrix after modification．Then，a study on optimizing the content of the SC modifier has been made to study the e仟ect of modifier content on amount and size of nodular graphite and matrix structure of ultra—low carbon ductile iron．But the SC content iS found has no obvious effect on the number and size of nodular graphite． Key WOrds：ultra-low carbon austempered ductile iron；SC modifier；graphite nodule ADI作为一种良好的耐磨材料，已广泛的应用于矿 金成分为1．0％～1．4％C、2．0％～3．0％Si、0．45％Mn、 山、汽车、建筑、