PROCESS OF PRODUCTION OF COMPLEX-SHAPED CASTINGS FROM HIGH- TEMPERATURE ALLOYS BASED ON NICKEL Russian patent published in 1998 - IPC

FIELD: foundry, specifically manufacture of rotors. SUBSTANCE: prepared ceramic casting mould manufactured by cast models is formed in moulding box with bearing filling agent displaying high heat conduction, for instance, metal rust-inhibiting grits. Ratio of thickness of layer of bearing filling agent to thickness of casting is 1:2.0-2.5. Grained grog of various fractions is used as filling agent of upper part of casting mould. Formed ceramic casting mould is calcinated at temperature of 950-1050 C, is placed into vacuum smelting plant. When temperature of casting mould reaches 700-800 C high- temperature alloy on nickel base having temperature of 1560-1580 C is poured. After pouring and cooling casting of rotor is subjected to thermal treatment ( homogenization ). Casting is heated to temperature of 1170-1180 C with rate of 8-12 C/min, is soaked in the course of 60 min and then heated to temperature of 1225 C with rate of 0.6-1.0 C/min. Cooling is conducted in air with rate of 15-25 C/min. Process provides for formation of optimal hardening γ′-phase and optimal ratio of indices of tensile strength, yield strength and impact elasticity. EFFECT: increased efficiency of process. 13 cl, 4 dwg, 6 tbl