CAJ | 학술논문

对Zn‐7Cu‐0．25M n合金在有无旋转磁场下水平连铸坯横截面宏观组织、微观组织的形貌及铜元素的分布进行比较分析，探讨旋转磁场对Zn‐7Cu‐0．25M n合金水平连铸坯组织和性能的影响。结果表明，当拉坯速度保持为53．3 mm／min时，施加频率为30 Hz、电流强度为100 A的旋转磁场，可以消除铸坯因为重力作用导致下部凝固速度大于上部凝固速度、最终凝固位置偏离中心线上移的现象；旋转磁场对水平连铸坯的凝固组织具有明显的细化作用，并且使铸坯的铜偏析现象得到明显改善；施加旋转磁场后铸坯的平均硬度较施加前略有提高。
대Zn‐7Cu‐0．25M n합금재유무선전자장하수평련주배횡절면굉관조직、미관조직적형모급동원소적분포진행비교분석，탐토선전자장대Zn‐7Cu‐0．25M n합금수평련주배조직화성능적영향。결과표명，당랍배속도보지위53．3 mm／min시，시가빈솔위30 Hz、전류강도위100 A적선전자장，가이소제주배인위중력작용도치하부응고속도대우상부응고속도、최종응고위치편리중심선상이적현상；선전자장대수평련주배적응고조직구유명현적세화작용，병차사주배적동편석현상득도명현개선；시가선전자장후주배적평균경도교시가전략유제고。
Macrostructure ,microstructure and copper distribution of horizontal continuous casting bil‐let of Zn‐7Cu‐0 .25Mn alloy with and without rotating magnetic field were investigated ,and the influ‐ences of rotating magnetic field on the microstructure and property of the casting billet were discussed in detail .The results show that when the casting speed is 53 .3 mm/min ,rotating magnetic field with 30 Hz current frequency and 100 A current intensity can effectively eliminate the phenomena of the so‐lidification rate of bottom billet larger than that of upper billet and terminal solidification zone drifting upward the geometrical center due to gravity .Rotating magnetic field can markedly result in refining of the solidification microstructure of casting billet ,and efficiently reduce copper segregation in the bil‐let .The average Vickers hardness of the billet can be improved slightly by applying rotating magnetic field to the casting process .