电磁连续铸造Sn-Pb空心管坯质量控制  

Control of macrostructure and surface quality during electromagnetic continuous casting of Sn-Pb hollow billets

作　　者：李丘林[1] 李廷举[1] 金俊泽[1] 

机构地区：[1]大连理工大学铸造工程研究中心,辽宁大连116023

出　　处：《材料科学与工艺》2003年第2期148-150,共3页Materials Science and Technology

基　　金：国家自然科学基金-上海宝钢'钢铁联合研究基金'资助项目(50270417).

摘　　要：为获得高质量的空心管坯,提出了在连续铸造过程中施加电磁场的空心管坯电磁连铸方法,并采用低熔点Sn-4 5%Pb(质量分数)合金模拟高熔点金属,研究了浇注系统及电磁场对空心管坯表面质量和宏观组织的影响.结果表明:在连续铸造过程中施加电磁场,可获得内外质量良好的空心管坯;当施加0 1kW的小功率电磁场时,可获得与强迫对流方向相反的V字型柱状晶组织;当功率增大到0 3kW时,内外相向生长的柱状晶变细变短,并在中部得到细小的等轴晶组织;采用小直径多浇口的雨淋式浇注系统和施加交变电磁场,有利于消除管坯内腔热节瘤,并得到周向均匀性较高的宏观凝固组织.In order to obtain high quality hollow billets, it is proposed to impose electromagnetic field during electromagnetic continuous casting process of hollow billets. Sn-45%mass Pb alloy was used to simulate higher melting melt to study the effect of pouring system and electromagnetic field on quality of hollow billets. The results of researches indicated that higher quality hollow billets can be obtained by imposing an electromagnetic field during electromagnetic continuous casting; V-shaped columnar grains are dominant in the macrostructure when the electric power of 01 kW is imposed; fine equiaxed grains grow face to face between columnar grains and become slender and shorter; and fine equiaxed grains are formed while electric power is increased to 03 kW; heat burls in hollow billets can be eliminated by of imposing an electromagnetic field, and so uniform macrostructures in the circumferential direction of billets can be gained.

关 键 词：电磁连续铸造 Sn—Pb空心管坯 质量控制 浇注系统 柱状晶 宏观凝固组织 结晶器 

分 类 号：TG249[金属学及工艺—铸造]