Abstract:
The cast process of superalloy double-properties cast integral turbine wheels was introduced.The form method,control means and pour parameters of grain structure of double-properties cast wheels were investigated.At the same time,the selection of double-properties cast wheels alloy material and the effect of heat treatment conditions on mechanical properties were also investigated.The results showed that the overheat temperature of molten metal ΔT and the mould revolution velocity n were 160～290℃ and K+270～K+300 rpm respectively.The directionally solidified columnar grain in airfoil and equiaxed fine grain in hub could be obtained.The heat treatment condition of double-properties cast wheels was 1180℃/2h+1230℃/3h,AC+1100℃/4h,AC+870℃/20h,AC.
