スプレイ冷却した金型に鋳造したAl-8%Pb系合金の凝固過程

概要

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Al-8%Pb-Cu and Al-8%Pb-4%Si alloy ingots were produced by casting into a movable metal mold with water spraying, and tehir cooling and solidification processes were clarified by thermal analysis. To obtain ingots with no gravity segregation of Pb and uniform dispersion of fine Pb phase, it was required that the narrow ranges of L1+L2 liquids and semi-molten states move quickly from the bottom to the top of the mold at the speed which is apporoximately equal to the moving speed of the mold. It was important that the temperature gradient was steep in both the higher temperature range of the L1+L2 region in which the diffusion growth of L2 phase is dominant and the lower temperature range in which the coalescing growth appeared. Therefore, it is recomended for casting ingots of hyper-monotectic Al-Pb system alloys that the diameter of ingots is 40mm, the mold speed is 1.0mm/s, the thickness of coating is as thin as possible and the casting temperature is just above the L1+L2 separating temperature.
日本鋳造工学会の論文