アルミニウム合金dc鋳造における各穘合金元素が及ぼす割れ感受性予測方法

摘要

アルミニウム合金の鋳造工程でみられる鋳造rn割れは，その後の加工熱処理工程での修復は非常に困難rnで，そのほとんどがスクラップとなるため，鋳造を経るrn工業プロセスの大きな問題点のーつである。%Since it has been difficult to predict crack sensitivity during aluminum DC casting depending on alloy composition, a new prediction method using the relation between solid fractions and the temperature inherent in alloys was developed. The method is based on indexes which are temperature dropping value and temperature dropping speed difference within high solid fraction region. It is confirmed that the indexes suitably represent the crack sensitivities through DC casting experiments.