Mtu Aero Engines Ag

Ralf Rettig

Robert Singer

Thomas Goehler

Steffen Neumeier

Ernst Affeldt

Rainer Voelkl

Michael Weiss

Harald Helmer

Mathias Goeken

Ernst Fleischmann

Uwe Glatzel

Nils Ritter

Robert F Singer

Thomas Göhler

The invention relates to a nickel-based alloy having a microstructure with a matrix of &#x3b3;-phase and precipitates of &#x3b3;'-phase. The &#x3b3;&#x2032;-phase comprises a percentage by volume of from 50 vol % to 80 vol % in the temperature range of from 1000&#xb0; C. to 1100&#xb0; C. The nickel-based alloy comprises 8 to 13 at % aluminum, 3 to 14 at % cobalt, 4 to 12 at % chromium, 0.6 to 8 at % molybdenum, 0 to 6 at % rhenium, 0.5 to 4 at % tantalum, 0.5 to 4 at % titanium, 0.3 to 3.5 at % tungsten, 0 to 4 at % germanium, 0 to 0.6 at % hafnium, 0 to 4 at % ruthenium, balance nickel and unavoidable impurities. The concentrations of molybdenum and tungsten are selected such that the percentage X of molybdenum and tungsten in the &#x3b3;-phase, X=0.84 C+C, is greater than 5.5 at % at a temperature of from 1000&#xb0; C. to 1100&#xb0; C., Cand Cbeing the concentrations of molybdenum and tungsten in at %.

Nickel-based alloy with optimized matrix properties

A nickel-base superalloy is disclosed. The superally includes aluminum, cobalt, chromium, molybdenum, tantalum, titanium and tungsten, in addition to nickel, as alloy constituents, wherein rhenium can additionally be contained and the rhenium content is less than or equal to 2 wt. % and wherein the titanium content is greater than or equal to 1.5 wt. %. Further disclosed is a component made of the nickel-base superalloy.

Rhenium-free or rhenium-reduced nickel-base superalloy

Disclosed is a nickel base alloy which is substantially free of rhenium and has a solidus temperature of more than 1320&#xb0; C. Precipitates of a &#x3b3;'-phase are present in a &#x3b3;-matrix with a fraction of 40 to 50 vol % at 1050&#xb0; C. to 1100&#xb0; C., and a &#x3b3;/&#x3b3;&#x2032; mismatch at 1050&#xb0; C. to 1100&#xb0; C. is from &#x2212;0.15% to &#x2212;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 &#x3b3;-matrix is greater than that in the precipitated &#x3b3;&#x2032;-phases.

Creep-resistant, rhenium-free nickel base superalloy

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Erlangen, Germany

Ralf Rettig