REFRACTORY NICKEL-BASED ALLOY FOR CASTING GAS TURBINE HOT SECTION PARTS Russian patent published in 2014 - IPC C22C19/05 

FIELD: metallurgy.

SUBSTANCE: invention can be used for casting the gas turbine hot section parts, for example, turbine working blades with equiaxed, directed and monocrystalline structures operated in aggressive media at 700-1000°C. Proposed alloy comprises the following components in wt %: carbon 0.08-0.10, chromium 8.85-9.15, cobalt 10.4-10.8, tungsten 5.60-5.85, molybdenum 0.20-0.30, titanium 3.0-3.2, aluminium 3.7-3.9, tantalum 3.9-4.1, rhenium 2.9-3.1, niobium 0.10-0.15, cerium 0.010-0.012, yttrium 0.010-0.012, lanthanum 0.010-0.012, magnesium 0.010-0.012, hafnium 0.10-0.15, boron 0.08-0.012, nickel making the rest. Total content of cerium, yttrium, lanthanum and magnesium makes at least 0.040-0.048 wt %, total content of hafnium and niobium makes 0.2-0.3 wt % while that of aluminium and titanium equals 6.8-7.1 wt% at titanium-to-aluminium ratio making 0.81-0.825.

EFFECT: increased long-term strength, higher oxidation and corrosion resistance.

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