抄録
Titanium alloy was continuously cast by an induction heating making use of a segmented conductive cold crucible. In this process, the electromagnetic coupling between the coil and the metallic change is promoted through the gaps between the segments. A liquid titanium alloy is confined detached from the crucible wall accompanied with the induction heating and the magnetic stirring. The controlled supply of the raw materials and the simultaneous continuous withdrawal of the ingot enabled the stable casting.
A technique of casting titanium alloy ingot by the supply of titanium turnings mixed with the alloy elements was demonstrated. This is of great advantage to the increase of titanium alloy species which can be cast. There was neither increase in copper contents nor decrease in volatile elements such as aluminum.
Suitable casting parameters resulted in the crack free surface with the unevenness as flat as ±5 μm. For the achievement of good surface quality, the casting velocity is so chosen that the solidification front on the periphery of the ingot is to be adjusted to the point where the melt and the crucible wall meet each other.
