# US 11,898,228 B2 · Alloy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,228 B2 - Document ID: US11898228B2 - Status: Granted - Kind: B2 - Application number: 17/402,699 - Filed: 2021-08-16 - Published: 2023-04-27 - Granted: 2024-02-13 - Earliest claimed: 2020-08-20 - Assignees: ROLLS-ROYCE plc - Applicants: ROLLS-ROYCE plc - Inventors: Mark C Hardy; David Dye; Lucy Reynolds; Thomas McAuliffe; Ioannis Bantounas - Web page: https://patentgrep.com/patent/US11898228B2 ## CPC - C22C 19/05: with chromium - C22C 30/00: Alloys containing less than 50% by weight of each constituent - C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%} - C22C 19/057: {with the maximum Cr content being less 10%} - C22F 1/10: of nickel or cobalt or alloys based thereon - C22C: ALLOYS (treatment of alloys C21D, C22F) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) ## Abstract A nickel-cobalt based superalloy composition consisting of by weight (wt.): 33.5 to 54 percent Ni; 19.5 to 36 percent Co; 9 to 12 percent Cr; 3.9 to 5.5 percent Al; 4.5 to 9.5 percent W; up to 5.5 percent Fe; 2 to 3.5 percent Mo; 0.6 to 5 percent Ta; 0.15 to 2.2 percent Ti; up to 1.75 percent Nb; up to 0.1 percent Hf; 0.005 to 0.03 percent C; 0.001 to 0.02 percent B; 0.005 to 0.06 percent Zr; up to 0.3 percent Si; up to 0.6 percent Mn; and the balance being impurities. ## Claims ### Claim 1 A nickel-cobalt based superalloy composition consisting of, by weight: 33.5 to 54 percent nickel; 19.5 to 36 percent cobalt; 9.0 to 12.0 percent chromium; 3.9 to 5.5 percent aluminium; 5.39 to 9.5 percent tungsten; up to 5.5 percent iron; 2 to 3.5 percent molybdenum; 0.6 to 5 percent tantalum; 0.15 to 2.2 percent titanium; up to 1.75 percent niobium; up to 0.1 percent hafnium; 0.005 to 0.03 percent carbon; 0.001 to 0.02 percent boron; 0.005 to 0.06 percent zirconium; up to 0.3 percent silicon; up to 0.6 percent manganese; and the balance being impurities. ### Claim 2 (depends on 1) A nickel-cobalt based superalloy according to claim 1, wherein the nickel and cobalt (Ni:Co) are present in the ratio between 1:1 and about 2.6:1 in atomic percent. ### Claim 3 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1 comprising by atomic percentage: 9-11.5 percent aluminium; 1.5 to 3 percent tungsten; 0.25-1.6 percent tantalum; 0.3-2.5 percent titanium; and up to 1 percent niobium; wherein a combined atomic percentage of aluminium, tantalum, titanium, niobium and 0.62 of tungsten in the nickel-cobalt based superalloy is between 12.5 and 16.25 percent to provide substantially 50 to 65 percent by volume gamma prime precipitates. ### Claim 4 (depends on 1) A nickel-cobalt based superalloy according to claim 1 comprising by atomic percentage: 1.5-3 percent tungsten; 1.3-2 percent molybdenum; wherein a combined atomic percentage of Mo+0.38 of W in the nickel-cobalt based superalloy is at least 2.44 percent. ### Claim 5 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein: the density at ambient temperature is less than 8.5 grams per cubic centimetre; and a combined atomic percentage of Mo+0.38 is no greater than 2.5 percent and a combined atomic percentage of W+Ta+Nb is no greater than 3.8 percent. ### Claim 6 (depends on 1) A nickel-cobalt based superalloy according to claim 1, wherein the nickel-cobalt based superalloy has a gamma prime solvus temperature of 1020 to 1125° C. ### Claim 7 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, and comprising by weight: 47 to 54 percent nickel; and 19.5 to 25 percent cobalt. ### Claim 8 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 35.5% cobalt; 10.5% chromium; 5.4% tungsten; 2.9% molybdenum; 4.15% aluminium; 3% tantalum; 1.5% niobium; 1.5% titanium; 0.015% carbon; 0.009% boron; 0.039% zirconium; and the balance being nickel and impurities. ### Claim 9 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 31.1% cobalt; 10.5% chromium; 5.4% tungsten; 2.9% molybdenum; 4.15% aluminium; 3% tantalum; 1.5% niobium; 1.5% titanium; 0.015% carbon; 0.009% boron; 0.039% zirconium; and the balance being nickel and impurities. ### Claim 10 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 28.1% cobalt; 10.5% chromium; 5% iron; 5.4% tungsten; 2.9% molybdenum; 4.15% aluminium; 3% tantalum; 1.5% niobium; 1.5% titanium; 0.015% carbon; 0.009% boron; 0.039% zirconium; and the balance being nickel and impurities. ### Claim 11 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 28.0% cobalt; 10.5% chromium; 5% iron; 5.4% tungsten; 2.9% molybdenum; 4.15% aluminium; 3% tantalum; 1.5% niobium; 1.5% titanium; 0.5% manganese; 0.1% silicon; 0.015% carbon; 0.009% boron; 0.039% zirconium; and the balance being nickel and impurities. ### Claim 12 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 19.8% cobalt; 10.5% chromium; 6.2% tungsten; 2.8% molybdenum; 4.4% aluminium; 3.8% tantalum; 0.8% niobium; 0.8% titanium; 0.015% carbon; 0.009% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 13 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 31.0% cobalt; 10.6% chromium; 5.5% tungsten; 2.9% molybdenum; 4.2% aluminium; 3.1% tantalum; 1.9% titanium; 0.015% carbon; 0.009% boron; 0.039% zirconium; and the balance being nickel and impurities. ### Claim 14 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 34.5% cobalt; 10.3% chromium; 8.4% tungsten; 3.2% molybdenum; 4.5% aluminium; 3.75% tantalum; 1.0% titanium; 0.020% carbon; 0.008% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 15 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 34.0% cobalt; 10.4% chromium; 8.4% tungsten; 3.2% molybdenum; 4.5% aluminium; 3.75% tantalum; 1.8% titanium; 0.020% carbon; 0.008% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 16 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 34.5% cobalt; 10.3% chromium; 8.3% tungsten; 3.2% molybdenum; 4.45% aluminium; 3.7% tantalum; 0.8% niobium; 0.25% titanium; 0.020% carbon; 0.007% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 17 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 34.2% cobalt; 10.3% chromium; 8.3% tungsten; 3.2% molybdenum; 4.4% aluminium; 3.7% tantalum; 1.5% niobium; 0.25% titanium; 0.020% carbon; 0.007% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 18 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 20.3% cobalt; 10.7% chromium; 6.3% tungsten; 2.9% molybdenum; 4.5% aluminium; 0.8% tantalum; 0.4% niobium; 0.8% titanium; 0.25% silicon; 0.015% carbon; 0.009% boron; 0.030% zirconium; and the balance being nickel and impurities. ### Claim 19 (depends on 1) A nickel-cobalt based superalloy as claimed in claim 1, wherein the nickel-cobalt based superalloy consists of, by weight: 34.1% cobalt; 11.3% chromium; 8.4% tungsten; 3.2% molybdenum; 5.2% aluminium; 3.8% tantalum; 0.015% carbon; 0.015% boron; 0.060% zirconium; and the balance being nickel and impurities. ### Claim 20 A nickel-cobalt based superalloy composition consisting of, by weight: 33.5 to 54 percent nickel; 19.5 to 36 percent cobalt; 9.0 to 12.0 percent chromium; 3.9 to 5.5 percent aluminium; 4.5 to 9.5 percent tungsten; up to 5.5 percent iron; 2 to 3.5 percent molybdenum; 0.6 to 3.4 percent tantalum; 0.15 to 2.2 percent titanium; up to 1.75 percent niobium; up to 0.1 percent hafnium; 0.005 to 0.03 percent carbon; 0.001 to 0.02 percent boron; 0.005 to 0.06 percent zirconium; up to 0.3 percent silicon; up to 0.6 percent manganese; and the balance being impurities. ### Claim 21 A nickel-cobalt based superalloy composition consisting of, by weight: 33.5 to 54 percent nickel; 19.5 to 36 percent cobalt; 9.0 to 12.0 percent chromium; 3.9 to 5.5 percent aluminium; 4.5 to 9.5 percent tungsten; up to 5.5 percent iron; 2 to 3.5 percent molybdenum; 0.6 to 3.80 percent tantalum; 0.15 to 2.2 percent titanium; up to 1.75 percent niobium; up to 0.1 percent hafnium; 0.005 to 0.03 percent carbon; 0.001 to 0.02 percent boron; 0.005 to 0.06 percent zirconium; up to 0.3 percent silicon; up to 0.6 percent manganese; and the balance being impurities, wherein the nickel-cobalt based superalloy has a bimodal size distribution of γ′ precipitates that includes: secondary γ′ precipitates that are between 50 and 200 nm in size, and tertiary γ′ precipitates that are less than 35 nm in size.