Accurate calculation of radiation heat transfer is one of the key factors to obtain high quality castings during directional solidification of superalloy.The finite differential mesh was modified to simulate the directional solidification heat transfer process of superalloy blades

and different process parameters were used for comparative analysis.The results show that

the mesh modification method can improve the accuracy of numerical calculation of radiative heat transfer on the outer surface of regular and irregular composite geometric models to a certain extent.When the drawing speed is 6 mm/min

the solid-liquid interface morphology of alloys presents the most stable.As the convective heat transfer coefficient between the shell and the alloy increases

the intermediate high temperature region of the blade alloy cross section is decreased gradually until the cross section temperature is tended to be uniform

and the temperature field is gradually decreased from the outside to the inside.