Safran

Centre National De La Recherche Scientifique

Office National D'etudes Et De Recherches Aerospatiales

Université Paris Est Creteil Val De Marne

Anne-Laure Rouffie

Jean-Michel Patrick Maurice Franchet

Pierre Jean Sallot

Didier Locq

Clara Desgranges

Loic Perriere

Ivan Georges Guillot

Mathilde Madeleine Louise Laurent

Guy Dirras

Thomas Philippe Joseph Rieger

Jean-Marc Eric Joubert

Jean-Philippe François Couzinie

A Nickel-based superalloy, whose composition includes, in percent by weight of the total composition: Chromium: 10.0-11.25; Cobalt: 11.2-13.7; Molybdenum: 3.1-3.8; Tungsten: 3.1-3.8; Aluminium: 2.9-3.5; Titanium: 4.6-5.6; Niobium: 1.9-2.3; Hafnium: 0.25-0.35; Zirconium: 0.040-0.060; Carbon: 0.010-0.030; Boron: 0.01-0.030; Nickel: remainder as well as unavoidable impurities; the composition being free of tantalum.

Nickel-based superalloy

A nickel-based superalloy includes, in atomic percentages, 13% to 21% chromium, 15% to 26% cobalt, 4% to 8% aluminum, 4.5% to 8% titanium, 8% to 18% iron, boron in an atomic percentage less than or equal to 0.5% or no boron, carbon in an atomic percentage less than or equal to 1% or no carbon, at least one additional element selected from molybdenum, tungsten, tantalum and niobium, a total atomic content of the at least one additional element being less than or equal to 1.5% or no such at least one additional element, the remainder being nickel and unavoidable impurities, with a sum of the atomic percentages of aluminum and titanium being comprised between 8.5% and 15%. The novel superalloy composition has a limited density and exhibiting, when hot, good mechanical properties as well as good resistance to oxidation and corrosion.

Superalloy with optimized properties and a limited density

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Moissy-Cramayel, France

Anne-Laure Rouffie