FIELD: manufacture of castings with directed and monocrystalline structure, for example blades of gas-turbine engines of air crafts, stationary gas turbine plants and other important designation parts.
SUBSTANCE: intermetallide nickel alloy is used as nickel alloy for casting. Method comprises steps of super heating melt before casting it by 250 - 290 C higher than liquidus temperature of alloy; soaking it no more than 3 min; then superheating alloy by 170 - 220°C higher than liquidus temperature of alloy and soaking it no more than 10 min; cooling alloy until temperature of pouring it at rate 10 - 50°C/min and pouring alloy into hot molds. Directed crystallization of alloy is realized due to moving mold from heating zone to zone for cooling at rate 40 - 240°C/min. After crystallization mold with casting is moved back from cooler to heater and it is soaked at temperature 1100 - 1150°C no less than for 15 -20 min.
EFFECT: less loss of yield, enhanced mechanical properties of alloys.
1 dwg, 1 tbl, 3 ex
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