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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Effects of chill casting processes onsecondary dendrite arm spacing and densification of Al-Si-Mg alloy
MI Guo-fa(米国发)1, LIU Xiang-yu (刘翔宇)1, ZHU Zhao-jun(朱兆军)2, WANG Hong-wei(王宏伟)2

1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;2. School of Materials Science and Engineering, Harbin Institute of Technology,Harbin 150001, China

Abstract:Based on the resin bonded sand casting process, the effects of chill processes on the secondary dendrite arm spacing(SDAS) and densification of Al-Si-Mg alloy were studied. The influences of the chill thickness and effective distance of chill operating on the SDAS were researched; and the effect of chill heat capacity on SDAS was investigated. The result reveals that, SDAS decreases with increasing the thickness of chill but the effect of chill is finite. The effective distance of chill operating for the chill with different thickness were obtained, and the functional relations among modulus, length of castings and thickness of chill were discussed, and the synthetical network chart of the relation among them was plotted. The relationship between local solidification rate and SDAS was defined by means of quadratic polynomial regression.

 

Key words: chill processes; secondary dendrite arm spacing; densification; Al-Si-Mg alloy

ISSN 1672-7029
CN 43-1423/U

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