Effects of chill casting processes on secondary dendrite arm spacing and densification of Al-Si-Mg a

• 作 者: MI Guo-fa LIU Xiang-yu ZHU Zhao-jun WANG Hong-wei
• 机 构: School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;Sch
• 出 处: 中国有色金属学会会刊（英文版）
• 发表日期: 2007年5期
• 关键词: chill processes secondary dendrite arm spacing densification Al-Si-Mg alloy

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 chillheat 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.