电磁场对铅黄铜水平连铸坯组织及偏析的影响  

Effect of electromagnetic field on solidification structures and segregation of lead brass billets by horizontal continuous casting

作　　者：曹志强[1] 康纪龙[1] 李廷举[1] 王同敏[1] 

机构地区：[1]大连理工大学铸造工程研究中心,辽宁大连116024

出　　处：《功能材料》2012年第2期166-169,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51071035);高等学校博士学科点专项科研基金资助项目(20100041110030)

摘　　要：研究了铅黄铜在无磁场、低频交变电磁场下水平连铸得到的铸坯横截面宏观组织、微观组织形貌及合金元素Pb的分布,并对其机理进行了分析。试验结果表明,在铅黄铜水平连铸的过程中施加低频交变电磁场能有效地细化晶粒及影响合金元素在横截面上的分布,并且电磁场有效地抑制了在常规水平连铸过程中出现的铸坯横截面上中下部位组织分布不均匀的现象。表现在铸坯横截面的凝固组织由上方主要为细小柱状晶、下方为粗大柱状晶变为均为细小的等轴晶,铸锭上部凝固滞后的现象消除;合金元素Pb的宏观偏析得到抑制,并且电流为30Hz、100A的组织优于30Hz、80A的组织。The macrostructure,microstructure and distribution of Pb element of horizontal continuously cast billets of lead brass were investigated,which was solidified under the actions of no electromagnetic field and with electromagnetic field,separately,and theoretically interpreted.Experimental results show that the structure of lead brass is refined effectively and distribution of Pb element is affected with the application of electromagnetic field during horizontal continuous casting,what,s more,the phenomenon that the uneven distribution of structure over the cross-section of the traditional horizontal continuous casting is suppressed,that is,the solidification structure of the top mainly being small columnar crystal,the bottom being coarse columnar grains changes to all of fine equiaxial ones.When the electromagnetic field is added,the solidification lag of ingot,s upper is eliminated;the macro-segregation of Pb element is suppressed,and the solidification structure of 30Hz,100A is better than that of 30Hz,80A.

关 键 词：铅黄铜 电磁场 水平连铸 凝固组织 宏观偏析 

分 类 号：TG249.7[金属学及工艺—铸造]