Investigation of the Effect of Chill Surface Roughness, Coating and Location on Heat Transfer During Solidification of Modified Al-Si Alloys

摘要

In the present work, the effect of chill parameters on heat transfer during solidification of Al-Si alloys is investigated. Modified alloys exhibited higher heat flux transients on coated chills due to improved wetting Wetting behaviour of the coating material had a significant effect on the estimated heat flux. Roughness of the chill had significant effect on heat flux transients particularly for unmodified alloys. Heat flux transients were lower for top chilled castings due to the absence of gravity effect. The peak heat flux obtained with bottom chilled castings is nearly three times compared to top chill experiments.