NICKEL-BASE ALLOY FOR SINGLE CRYSTAL SEEDS AND METHOD OF ITS SMELTING Russian patent published in 2000 - IPC

FIELD: nonferrous metallurgy. SUBSTANCE: alloy offered for production of single crystal refractory seeds contains, wt%: one element from group including rhenium and rhodium 25-50; yttrium 0.001-0.100; the balance, nickel. Method of alloy smelting includes charging of mixture, its melting under vacuum, multiple thermocycling of melt by its heating to temperature of 1660- 1780 C, holding at this temperature and cooling down to temperature of 1630-1650 C with simultaneous electromagnetic stirring, deoxidation of melt and its pouring. In so doing, duration of heating and holding of melt relates to period of cooling and stirring of melt as (2-3):(1-1.5). EFFECT: extended potentialities of production process due to use of seeds from nickel alloy with high melting point, higher working temperature in casing of single crystal blades of gas turbine engines and gas turbine installations of preset crystallography orientation, increased yield of product by macrostructure by 7-10%. 4 cl, 2 tbl