东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2009, Vol. 30 ›› Issue (2): 213-216.DOI: -

• 论著 • 上一篇    下一篇

低频电磁热顶铸造7050铝合金的表面质量和组织

王向杰;左玉波;赵志浩;崔建忠;   

  1. 东北大学材料电磁过程研究教育部重点实验室;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2009-02-15 发布日期:2013-06-22
  • 通讯作者: Wang, X.-J.
  • 作者简介:-
  • 基金资助:
    国家重点基础研究发展计划项目(2005CB623707)

Surface quality and structure of 7050 aluminum alloy by low frequency electromagnetic hot-top casting

Wang, Xiang-Jie (1); Zuo, Yu-Bo (1); Zhao, Zhi-Hao (1); Cui, Jian-Zhong (1)   

  1. (1) Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2009-02-15 Published:2013-06-22
  • Contact: Wang, X.-J.
  • About author:-
  • Supported by:
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摘要： 在传统热顶铸造基础上,开发了一种新的热顶铸造结晶器,并在铸造过程中施加了低频电磁场,得出了稳定铸造φ500 mm 7050高强铝合金铸锭的工艺条件;当电磁场频率为15 Hz、磁场强度为10000 At时,铸造出了表面光滑的铸锭.采用偏光显微镜(Leica DMI)观察试样,分析试样的微观组织.实验结果表明:铸造过程中施加低频电磁场能提高铸锭的表面质量,细化铸锭的内部组织,以及抑制铸锭内部裂纹的产生.总结了低频电磁铸造改善表面质量和细化组织的原因以及低频电磁场对液穴形状的影响.

关键词: 热顶铸造, 铸态组织, 表面质量, 电磁场, 铝合金

Abstract: A new hot-top casting mold was developed on the basis of conventional hot-top casting, and the low-frequency (LF) electromagnetic field was applied in the process of casting. The stable technological conditions for hot-top casting of φ500 mm 7050 high-strength aluminum ingots were gotten, i.e. smooth ingots were available, when electromagnetic frequency is 15 Hz with electromagnetic intensity 10000 At. The microstructure of ingot samples were observed by Leica DMI microscope. Experimental results showed that the LF electromagnetic field can improve the surface quality of ingot with grain refining and internal cracks suppressed, and the reasons why the quality of ingots are improved and the effect of LF electromagnetic field on the shape of melt cave were summarized.

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