Numerical simulation of vacuum arc remelting process of TiAl alloy with 180 mm in diameter was carried out to understand effects of melting temperature

melting velocity and cooling rate on temperature gradient in metal pool

melting pool shape and mushy zone width. The results show that with increasing in melting temperature

depth of melting pool is increased

and its shape is transformed from bowl shape to V-shape. Meanwhile

melting temperature has the slight effects on temperature gradient in melting pool and mushy zone width at solidification front. With the increase of melting velocity

temperature gradient is greatly decreased

and mushy zone width and melting pool depth are obviously decreased also. With the improvement of cooling rate

mushy zone width is greatly decreased with the slight decrease of temperature gradient and melting pool depth.