Abstract
The surface cracking of ingot is happened by the influence from the chemical compositions.
This report is on the study of hot cracking of alloys ingots cast by ring casting method. Al-Fe-Si cast alloys and Al-Mg-Si alloys are used for this experiment where Ti or Cu is added to these alloys and composition-cacking graphs are prepared for each system of the alloys. With these graphs, the effects of Ti are examined by comparison. When 0.04-0.15% Ti is added, the effect is well recogniged at 0.04% Ti. Effect of Cu to Al-Mg-Si system is examined with various quantities of Cu. It was found out from the examination, the cracking increased when 0.3% Cu is added, but if 2% Cu is added it is rather decreased.
