CAST HEAT-RESISTANT NICKEL ALLOY WITH MONOCRYSTALLINE STRUCTURE Russian patent published in 2022 - IPC C22C19/05 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy – to production of cast heat-resistant nickel alloys intended for casting blades and other critical parts of gas turbines having a single-crystal structure. Cast heat-resistant nickel alloy with monocrystalline structure contains carbon, chromium, cobalt, tungsten, molybdenum, aluminum, tantalum, rhenium, boron, cerium, lanthanum, yttrium, magnesium, it differs by the fact that it additionally contains hafnium, manganese, silicon, scandium, titanium, niobium, zirconium at the following ratio of components, wt%: carbon 0.002–0.1, chrome 2.8–6.0, cobalt 3.0–6.5, tungsten 2.0–5.0, molybdenum 1.5–3.5, aluminum 5.4–6.3, titanium 0.1–1.2, niobium 0.1–1.0, tantalum 7.2–9.0, hafnium 0.1–0.3; rhenium 4.3–7.0, boron 0.005–0.01, zirconium 0.005–0.03, cerium 0.001–0.1, lanthanum 0.001–0.1, yttrium 0.001–0.1, magnesium 0.01–0.03, manganese 0.01–0.2, silicon 0.01–0.2, scandium 0.005–0.03, nickel – the rest, subject to the following conditions: 44.2≥3.0C_Mo+1.6C_W+2.3C_Ta+1.3C_Re+10.0C_Hf, where C_Mo, C_W, C_Ta, C_Re, C_Hf – concentration of corresponding alloying elements in alloy, wt%, and C_Al/(C_Ti+C_Nb+C_Ta+C_Hf+0.57C_W+0.46C_Mo)≥1.0 (at.%/at.%), where C_Al, C_Ti, C_Nb, C_Ta, C_Hf, C_W, C_Mo – concentration of corresponding elements in γ'-phase, at.%.

EFFECT: reduced specific weight of alloy at maintaining high level of heat resistance.

1 cl, 2 tbl