研究論文
OCCプロセスにより鋳造したAl-Fe系合金線材の凝固形態に及ぼす冷却速度の影響
2019 年 91 巻 1 号 p. 14-20
詳細
2019 年 91 巻 1 号 p. 14-20
Unidirectional solidified Al-Fe alloy wires, 6 mm in diameter, were produced by Ohno Continuous Casting (OCC). The alloy composition used was 0.7 to 3.0% Fe and the casting speeds were 0.83 to 8.3 mm/s. The effect of the cooling rates on the solidification structures of the Al-Fe alloy OCC wires was studied. The cooling rate of the cast wires increased proportionally with the casting speed. In all the Al- (0.7 to 1.6%) Fe hypoeutectic alloy wires, the cast structures consisted of unidirectional solidified α-aluminum dendrites and eutectic structures. In the Al-1.9%Fe hypereutectic alloy wires, the cast structures were similar with primary crystals of hypoeutectic compositions. However, in the Al-3.0%Fe hypereutectic alloy wires cooled at the low rate of 4.62K/s, the cast structures consisted of unidirectional solidified eutectic cells. At cooling rates above 44.4K/s, the cast structures exhibited α-aluminum dendrites and eutectic structures. In the Al-1.9, 3.0%Fe hypereutectic alloys, primary intermetallic compounds (primary crystals of hypereutectic composition) were not observed. The shape of the solid-liquid interface of the wires was almost perpendicular to the casting direction.
