NICKEL-BASED SUPERALLOY, MONOCRYSTALLINE BLADE AND TURBOMACHINE Russian patent published in 2022 - IPC C22C19/05 F01D5/28 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to nickel-based superalloys for gas turbines, in particular for stationary blades or movable blades of a gas turbine, for example, in the aerospace industry. The nickel-based superalloy consists of, wt.%: from 4.0 to 5.5 of rhenium, from 3.5 to 12.5 of cobalt, from 0.30 to 1.50 of molybdenum, from 3.5 to 5.5 of chromium, from 3.5 to 5.5 of tungsten, from 4.5 to 6.0 of aluminum, from 0.35 to 1.50 of titanium, from 8.0 to 10.5 of tantalum, from 0.15 to 0.30 of hafnium, from 0.05 to 0.15 of silicon, the rest is nickel and unavoidable impurities, and it has a spotting absent parameter (hereinafter – SAP) of SAP = [%Ta + 1,5%Hf + 0,5%Mo – 0,5%Ti)]/[%W + 1,2%Re)] equal to 0.7 or more, where %Ta, %Hf, %Mo, %Ti, %W, and %Re are levels of content of corresponding components of the superalloy, wt.%. The alloy has a monocrystalline structure including separations of γ'-Ni₃(Al,Ti,Ta) dispersed in γ-matrix with a size of 300-500 nm in amount of 50-70 vol.%.

EFFECT: alloy is characterized by high resistance to creep at a high temperature, high resistance to oxidation, as well as has a stable microstructure in a superalloy volume with low sensitivity to the formation of TPU structures and stability of microstructure under a connecting layer of thermal barrier coating.

24 cl, 3 dwg, 7 tbl, 14 ex