METHOD FOR CASTING Ti-Al BASED ALLOY

Abstract

The objective of the present invention is to improve non-defective product yield by reducing shrinkage cavities inside small-diameter ingots, in a method for casting active metals. In this Ti—Al based alloy casting method for casting an ingot of Ti—Al based alloy by tapping molten metal from a tapping hole ( 5 ) provided in a bottom portion of a water-cooled copper crucible ( 2 ), in an induction melting furnace ( 3 ) employing said crucible ( 2 ), into a casting mold ( 4 ), the degree of vacuum inside the induction melting furnace ( 3 ) when the Ti—Al based alloy is being melted or cast is in a range of 80 to 700 Torr, and the Al concentration in the cast ingot is within ±1.0 mass % of a target value.

1 . A method for casting a Ti—Al based alloy comprising:
 tapping molten metal from a tapping hole provided in a bottom portion of a water-cooled copper crucible in an induction melting furnace; and 
 casting an ingot of Ti—Al based alloy, wherein 
 a degree of vacuum in the induction melting furnace at the time of melting or casting the Ti—Al based alloy is set within a range of 80 Torr to 700 Torr, and 
 a concentration of Al of the cast ingot is set within ±1.0 mass % of a target value.