阻尼冷却管法制备A356铝合金半固态浆料的研究

A356 Aluminum Alloy Semisolid Slurry Prepared by Damper Cooling Tube Process

摘要:

介绍了阻尼冷却管法制备半固态浆料工艺的实验装置及其原理，采用A356铝合金进行了不同浇注温度的系列实验。铸件微观结构中晶粒尺寸和形状因子测算分析结果表明：由于阻尼冷凝管的冷却和搅拌作用，熔体浇注温度越低，在两相温度区间内生成的游离晶核就越多，浇铸的铸件晶粒尺寸和形状因子数值就越小，晶粒球化程度越高。阻尼冷凝管法制备的合金浆料或铸坯能够应用于下一步半固态成形加工。

Abstract:

The setup and principle od damper cooling tube (DCT) process to prepare the semisolid slurry of A356 aluminum alloy were introduced in different pouring temperatures. The results of measured and calculated grain size and shape factor in castings microstructure show that they are directly related to the pouring temperature, the lower the pouring temperature, the smaller the grain size and shape factor, due to the formation of stray nucleus and the cooling and stir of DCT. The semisolid slurry or billet produced by DCT processis are suitable for the semisolid processing owing to the fine grain size and spherical primary particles.