スプレイ冷却可動式金型鋳造によるAl-Pb合金の均質鋳塊の製造
1986 年 50 巻 1 号 p. 98-107
詳細
1986 年 50 巻 1 号 p. 98-107
Al-8%Pb alloy ingots 20 to 40×10−3 m in diameter and 180×10−3 m in height were cast in a movable metal mold with water spraying at mold moving speed of 0.5 to 3.0×10−3 m/s at a casting temperature of 1273 K. Cooling rate and temperature gradient of these ingots within a temperature range in which two liquid phases coexist were 2.5 to 15.5 K/s and 5 to 4.5×103 K/m respectively and rate of monotectic solidification was 500 to 4500 μm/s. When cooling and solidification modes were the intermediate type between solidification by water dipping and unidirectional soliclification, gravity segregation was reduced in these ingots. This solidification mode is to cool the liquid phase from the side wall of a metal mold and to cool unidirectionally by a solidified layer beneath it. Based on this cooling mode, the homogeneous ingot could be produced according to the solidification mode which solidify steadily in the vertical unidirection into a L1+L2 region with high heat gradient. The casting condition was 40×10−3 m in diameter, 1.0×10−3 m/s in mold moving speed and 1273 K in casting temperature.
