高频电磁场对灰铸铁石墨形态的影响  

Effects of High Frequency Electromagnetic Field on Graphite Morphology in Gray Cast Iron

作　　者：陈锋[1] 范金辉[1,2] 刘瑞玲[2] 谢红顶[1] 朱世根[1] 

机构地区：[1]东华大学机械工程学院,上海201620 [2]河北科技大学材料科学与工程学院,河北石家庄050000

出　　处：《铸造》2013年第7期624-627,632,共5页Foundry

基　　金：河北省教育厅科研计划项目(2006421)

摘　　要：采用频率为50 kHz的高频电磁场对灰铸铁熔体进行处理,探讨了高频线圈匝数、通电电流和处理时间对灰铸铁凝固组织的影响。试验结果表明,高频磁场有效地改变了灰铸铁的石墨形态,使长直粗大的片状石墨变成均匀细小弯曲的形态。合适的线圈匝数和电流大小能够在短时间内达到显著的细化效果,其主要原因是电磁力引起的剧烈电磁搅拌作用和高频感应热效应。By treating the gray cast iron melt with high frequency electromagnetic field of 50 kHz, the effects of high frequency coil turns, electric current and processing time on the solidification structure of gray cast iron was discussed. The results indicate that high frequency electromagnetic field could change the graphite morphology in gray cast iron effectively, and the graphite morphology was transformed from curving and long flake to fine and crimpy flake. The appropriate coil turns and current could remarkably refine the graphite in a short time. The reasons causing those effects were attributed to electromagnetic stirring caused by electromagnetic force, and high frequency induction heat.

关 键 词：高频电磁场 灰铸铁 石墨形态 

分 类 号：TG21[金属学及工艺—铸造]