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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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Effect of low frequency electromagnetic field on microstructures and macrosegregation of horizontal direct chill casting aluminum alloy
ZHAO Zhi-hao(赵志浩), CUI Jian-zhong(崔建忠), DONG Jie(董 杰), 
ZHANG Hai-tao(张海涛), ZHANG Bei-jiang(张北江)

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, 
Northeastern University, Shenyang 110004, China

Abstract: The influences of low frequency electromagnetic field on cast surface, microstructures and macrosegregation in horizontal direct chill(HDC) casting process were investigated experimentally. The cast surfaces, microstructures and macrosegregation of the ingots manufactured by conventional HDC and low frequency electromagnetic HDC casting were compared. The results show that low frequency electromagnetic field significantly improves the surface quality, refines the microstructures and reduces macrosegregation. Further more, increasing electromagnetic intensity or decreasing frequency is beneficial to the improvement. In the range of ampere-turns and frequency employed in the experiments, the optimum ampere-turns is found to be 10000A•turn and the frequency to be 30Hz.

 

Key words:  horizontal direct chill casting; low frequency electromagnetic field; microstructure; macrosegregation

ISSN 1672-7029
CN 43-1423/U

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