电磁搅拌对C3604铜合金水平连铸坯组织性能的影响  

Effect of Electromagnetic Stirring on Solidification Structures and Properties of C3604 Brass Alloy Billets by Horizontal Continuous Casting

作　　者：王继军 刘庆 曹安琪[2] 王同敏[2] 曹志强[2] 李廷举[2] 

机构地区：[1]宁波博威合金材料股份有限公司,浙江宁波315137 [2]大连理工大学铸造中心,辽宁大连116024

出　　处：《铸造》2014年第6期536-540,共5页Foundry

基　　金：国家自然科学基金(51071035@51375070);高等学校博士学科点专项科研基金(20100041110030)

摘　　要：研究了C3604铜合金在有无电磁搅拌下水平连铸得到的铸坯横截面宏观组织、微观组织形貌及硬度的分布。试验结果表明,在C3604铜合金水平连铸的过程中施加电磁搅拌能有效地细化晶粒并使得横断面上中下三点铅分布和硬度也趋于一致。在所选择的频率和电流强度范围内,35 Hz和100 A的搅拌效果最佳。施加电磁搅拌之后,铸锭表面着水线由原先与水平成一定角度变为垂直。说明上下凝固界面在结晶器内同一位置,消除了因上下冷却程度不均匀造成最终凝固位置偏离中心线向上偏离的现象。施加电磁搅拌后切削的铜屑大小均匀,切削性能好。矫直效果稳定且直度均匀,不会发生弯曲,其产品交检合格率高于以往产品的交检合格率。The macrostructure,microstructure and hardness of horizontal continuously cast billets of C3604 brass alloy were investigated,which was solidified under the actions of no electromagnetic stirring and with electromagnetic stirring,separately.The experimental results show that the structure ofC3604 brass alloy with electromagnetic stirring is refined effectively and the distribution of Pb element and the hardness over the cross-section tends to uniform.Among the used currents and frequencies,the stirring effect of 35Hz and 100A is the best.The touching waterlines appearing on ingot surface change from a certain angle with the horizontal to vertical after the application of electromagnetic stirring.It illustrates that the solidification interface of upper and bottom locates at the same place in the crystallizer,which is helpful to eliminate the phenomenon of terminal solidification zone drifting upward the geometrical center without stirring resulting from the differential cooling effect between bottom and top.With the application of electromagnetic stirring,the size of copper drilling scraps is uniform and the machinability is good.The effect of straightening is stable with homogeneous straightness,not bending and the strip product qualified rate is higher than before.

关 键 词：C3604铜合金 电磁搅拌 水平连铸 组织 硬度 

分 类 号：TG249.7[金属学及工艺—铸造]