Aiming at the problems of misrun and coarse columnar crystal defects at the exhausting side of a K418 B turbine guide under gravity investment casting

the centrifugal casting process was designed and simulated

and actual casting verification as well as grain size observation of the guide were carried out.The results show that the centrifugal casting process can improve effectively the filling capacity of the guide and eliminate the casting defects at the exhaust side.At the same time

under the action of centrifugal force field

fine equiaxed grains are formed in the blade during the solidification process

which fundamentally inhibits the formation of coarse columnar crystal defects and improves the comprehensive mechanical properties of the guide.