Ta-containing Fe-Ni based superalloys with high strength and oxidation resistance for high-temperature applications

US11255003B2 · kind B2 · utility

Assignee

• UT-BATTELLE, LLC · US

Inventors

• Ying Yang · Knoxville, US
• Bruce A. Pint · Knoxville, US
• Jonathan D. Poplawsky · Knoxville, US
• Lizhen Tan · Knoxville, US

Key dates

• Filing date: Mar 30, 2020
• Grant date: Feb 22, 2022
• Expiry date: Apr 21, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/48
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A Fe—Ni based alloy comprising, in weight percent: Ni 30-35; Cr 12-14; Al 3-5; Ti 0-2; Ta 2-8; C<=0.05; B<=0.005; Zr<=0.2; Si<0.5; where Cr/(Cr+Fe+Ni)=0.125-0.145; Al/(Al+Ti+Ta)=0.15-0.5; and Fe≥Ni; balance Fe, the alloy having a face-centered cubic (fcc) matrix with from 25 to 30 vol. % of L12-type γ′-Ni3M (M=Al, Ta, Ti and mixtures thereof) precipitates.