The vacuum arc remelting (VAR) process of 300 mm diameter γ-TiAl alloy ingot was studied by numerical simulation methods. The influence of the melting pool shape

temperature field

and stress field during VAR process of TiAl alloy under different conditions was obtained. The results showed that at the initial stage of VAR

the melting pool had a flattened shape

and it became deeper and V-shape during the stable melting stage. During the melting process

there were tensile stress zones on the surface of the solidified region of the ingot

and the tensile stress increased with the progress of melting

reaching a maximum of 430 MPa. During the subsequent cooling process

the tensile stress decreased

and at 400 s after the end of melting

the maximum tensile stress decreased to 180 MPa. The melting process was simulated separately at melting speeds of 3 kg/min

6 kg/min

9 kg/min

and 12 kg/min. As the melting speed increased

the melting pool became deeper

and the shape of the melting pool changed from V-shaped to U-shaped. At 500 s after the end of melting

the maximum tensile stress on the surface of the ingot prepared at a melting rate of 3 kg/min is 120 MPa

and the maximum tensile stress on the surface of the ingot prepared at a melting rate of 12 kg/min is 235 MPa. The heat transfer coefficient had a certain influence on the shape of the melting pool

with the increase of heat transfer coefficient

the shape of bottom of the molten pool changes from wide to shape

but it has little effect on the depth of the melting pool and a relatively small impact on the stress field in the ingot.