Creep-resistant, rhenium-free nickel base superalloy

US9580774B2 · kind B2 · utility

Assignee

• MTU Aero Engines AG · DE

Inventors

• Ralf RETTIG · Erlangen, DE
• Robert Singer · Erlangen, DE
• Harald Helmer · Erlangen, DE
• Steffen NEUMEIER · Erlangen, DE

Key dates

• Filing date: Oct 23, 2013
• Grant date: Feb 28, 2017
• Expiry date: Oct 1, 2035

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01D5/28
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed is a nickel base alloy which is substantially free of rhenium and has a solidus temperature of more than 1320° C. Precipitates of a γ′-phase are present in a γ-matrix with a fraction of 40 to 50 vol % at 1050° C. to 1100° C., and a γ/γ′ mismatch at 1050° C. to 1100° C. is from −0.15% to −0.25%. The alloy comprises 11 to 13 at % aluminum, 4 to 14 at % cobalt, 6 to 12 at % chromium, 0.1 to 2 at % molybdenum, 0.1 to 3.5 at % tantalum, 0.1 to 3.5 at % titanium, 0.1 to 3 at % tungsten. The tungsten content of the γ-matrix is greater than that in the precipitated γ′-phases.