脉冲电场与稀土.doc

脉冲电场Fe-C-S系合金凝固过程影响 (，王海川，李新 (安徽工业大学 冶金与资源学院，安徽 马鞍山243002) 摘要：纯铁硫化亚铁Fe-C-S系合金熔体Fe-C-S系合金熔体凝固过程中脉冲电场及稀土的分析脉冲电场Fe-C-S系合金熔体组织分布及夹杂物性状的影响Fe-C-S系合金S元素分布，共同作用稀土有效减和细化夹杂物，夹杂物的直径μm下降到μm以下，夹杂物形貌条状硫化物转变球状硫化物。 关键词：Fe-C-S系合金脉冲电场稀土夹杂物 doi:10.3969/j.issn.1671-7872.2013.03 Effects of Electric Pulse and RE on the Solidification Process of Fe-C-S System Alloy LIAO Zhiyou，WANG Haichuan，LI Xin (School of Metallurgy Resources，Anhui University of Technology， Maanshan，Anhui， 243002,China) Abstract：The paper carries out the research of the effect of pulsed electric field and rare earth on the solidification process of Fe-C-S alloy which is prepared with industrial pure iron, graphite, iron sulfide and other raw materials. It analyses the impact of pulsed electric field and rare earth on solidification organization、sulfur distribution and inclusions properties of the melt.The results show that both pulsed electric field and rare earth can reduce the grain boundary and improve solidification organization. Element sulfur distribution in the melt is also optimized .Co-action of pulsed electric field and rare earth is more effective than rare earth alone. Both pulsed electric field and rare earth can reduce and refine the inclusions. The diameter of the inclusions reduce from 35-50 μm to below 25 μm. The morphologyof inclusion is better controlled,Most strip sulfide inclusions turn into globular sulfide inclusions. Key words: Fe-C-S system alloy ；pulsed electric field；are earth；nclusions 脉冲电流技术是指在液态金属凝固过程中施加电场来控制材料凝固组织和性能的一种方法[1-]，近20多年来，电脉冲处理发展迅猛范金辉[4]研究表明采脉冲电流能够明显细化和改善过共灰口铸铁的凝固组织，使石墨由粗的片状变为小块状或小片状分布更加均匀尖角钝化甚至呈近似球形[5]通过改变脉冲电场的电压对钢液进行处理,研究了脉冲电场处理对钢液凝固元素迁移特性和晶粒细化的影响；李平等[6]在连铸中间罐内对09CuPCrNi钢水进行电脉冲孕育处理，发现连铸坯的凝固组织可以明显细化，柱状晶长度明显缩短，一次枝晶臂间距明显减小，而且连铸坯的中心等轴晶区扩大,中心缩孔得到明显改善。已有文献脉冲电的加入可显著细化晶粒组织，改善材料的宏观特性，由于电场的作用机理尚不明确，对高熔点钢液研究仍处于起步阶段。稀土作为添加剂正被广泛应用钢铁生产中，净化钢液细化晶粒减少成分偏析及微合金化从而提高钢材质量[]。但目前研究将脉冲电场共同应用到熔体凝固过程中来改善钢材性质。基于此，开展Fe-C-S系合金熔体凝固过程施加脉冲电场添加的研究分析脉冲电场和稀土熔体组织元素分布特性以及夹杂物性状的影响纯铁石墨硫化亚铁纯铁Fe 99.85%，C 0.02%，Si