CREM法半连铸铝合金初凝壳与磁场强度的关系  

Relationship between electromagnetic intensity and initial solidified shell height of aluminum alloy produced by CREM process

作　　者：张勤 路贵民[1] 崔建忠[1] 张北江[1] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,沈阳110004

出　　处：《中国有色金属学报》2002年第1期48-51,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家重大基础研究发展规划资助项目 (G19990 64 90 5 0 1)

摘　　要：研究了不同强度交变电磁场作用下 ,70 75合金凝固壳高度及铸锭表面质量的变化规律。结果表明 ,随着磁场强度增加 ,熔体与结晶器的接触高度以及凝固壳高度减小 ,初凝壳形成位置点降低 ,铸锭表面质量提高。采用晶粒游离理论解释了电磁场作用下初凝壳的形成机制 ,认为电磁场作用下 ,晶粒从结晶器壁游离数量增加 ,稳定初凝壳难以形成 ,是延缓初凝壳形成时间和降低初凝壳形成位置的根本原因。Under the effect of electromagnetic field with low frequency, the evolutions of solidified shell height and surface aspects, bearing on 7075 aluminum alloy produced by CREM process, have been investigated. The results show that the gradual enhancement of the electromagnetic intensity allows a decrease in the height of solidified shell and in the contact height between melt and mold, which improve surface aspects of the ingot. Crystal dissociating theory are used to explain the formation mechanism of initial solidified shell under the effect of electromagnetic field. It is pointed out that under the effects of electromagnetic field, the decrease of crystal particles dissociated from the crystallizer wall results in the difficulty of formation of solidified shell, which is the key reason that delay the time and decrease the position of forming the initial solidified shell.

关 键 词：CREM法 半连续铸造 铝合金 初凝壳 电磁铸造 磁场强度 

分 类 号：TG292[金属学及工艺—铸造] TG249.7