Ichiji Obinata, Kensuke Kurihara, Yô Takeuchi and Rokuro Kawanishi
Observing the process of solidification of molten aluminium droplets in water and examining also the structures and properties of the solidified granules, it has been shown that if molten aluminium or its alloys are cast into thin mould set into hot water, the ingot having homogeneous equiaxed structure may be obtained. This process of casting is named as ``Subaquatic Casting'' process or briefly ``S.A.C. process'' by the present writers. In the 1st report, macrostructures of the ingots made of Al, Al-1.2Mn, Al-4.5Cu and Al-5Mg alloys by S.A.C. process in the laboratory scale has been shown and the effect of casting conditions, that is casting temperature, pouring rate and the temperature of water, on the macrostructures have been pointed out. From the results of examination it is concluded that if suitable casting conditions may be choosen, the macrostructures of ingot by S.A.C. process is always homogeneous and no columnar crystals may be seen irrespective of the sort of alloys. The cause of formation of such homogeneous structure during the solidification in S.A.C. process has been discussed and attributed it to the homogeneous cooling effect due chiefly to the latent heat of vaporization of hot water.
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