螺旋磁场对金属凝固过程中成分偏析的影响  

Effects of Spiral Magnetic Field on the Composition Segregation in the Metal during Solidification Process

作　　者：赵倩[1] 房灿峰[1] 侯晓光[2] 韩彦博[1] 张楠[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院 [2]宝山钢铁股份有限公司

出　　处：《特种铸造及有色合金》2011年第6期495-500,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50875031);宝钢高新技术项目(10K029ECES)

摘　　要：通过模拟钢连铸金属凝固的条件,以低熔点合金为研究对象,分析了螺旋磁场对凝固组织的影响。发现螺旋磁场能够消除成分偏析、碎断枝晶和细化凝固组织。同时,对比研究了不同磁场方式对凝固组织的影响。在相同电磁搅拌参数下,螺旋磁场比旋转磁场更能减小铸锭上下部成分之间的差异并细化晶粒,对促进铸锭成分均匀化有更好的效果;螺旋磁场电磁力分布更有利于形成较大区域的均匀搅拌,对形成等轴晶有明显的促进作用,且晶粒排列的方向性比旋转磁场处理下的更小,即各向同性效果更好。Effects of spiral magnetic field on solidification structure of the continuous casting low point alloy were investigated. It is found that the spiral magnetic field can effectively relieve the macro-segregation and cause the broke of dendrite and refinement of solidification structure. Meanwhile, effects of different magnetic fields on solidification structure were analyzed comparatively. The results reveal that, at the same electromagnetic stirring parameters, compared with rotating magnetic field, spiral magnetic field exhibits the better effect in decreasing composition segregation between the bottom and the top of ingot, refining grain size and promoting the homogenization of ingot composition. Distribution of electromagnetic force in the spiral magnetic field is more beneficial for the uniform stirring of the larger zone to effectively promote the formation of equiaxed grain. Meanwhile, orientation of grain arrangement in the spiral magnetic field is lower than that in rotating magnetic field, exhibiting the more acceptable isotropy.

关 键 词：螺旋磁场 旋转磁场 成分偏析 低熔点合金 

分 类 号：TG244.3[金属学及工艺—铸造]