Alstom Technology Limited

Ansaldo Energia IP UK Limited

Andreas Kuenzler

Mohamed Youssef Nazmy

Markus Staubli

Claus Paul Gerdes

Thomas Etter

Thomas Kramer

Robert Baumann

Roman Engeli

Mohamed Yousef Nazmy

Paul Claus Gerdes

David Duhl

Fabian Geiger

The invention relates to a method of post-built up heat treatment of an additively manufactured high strength component made of a gamma-prime strengthened superalloy based on Ni or Co or Fe or combinations thereof. An application of a rapid heating-up rate of 25 to 60&#xb0; C./min in a specific temperature range during the first post-built heat treatment after additive manufacturing avoids or at least minimizes the gamma-prime precipitation in the component during heat-up. This results in crack-free components/articles compared to significant cracking present in conventionally heat treated components.

Method for post-built heat treatment of additively manufactured components made of gamma-prime strengthened superalloys

A nickel-base superalloy is characterized by the following chemical composition (details in % by weight): 7.7-8.3 Cr, 5.0-5.25 Co, 2.0-2.1 Mo, 7.8-8.3 W, 5.8-6.1 Ta, 4.9-5.1 Al, 1.0-1.5 Ti, 1.0-2.0 Re, 0.11-0.15 Si, 0.1-0.7 Hf, 0-0.5 Nb, 0.02-0.17 C, 50-400 ppm B, remainder Ni and production-related impurities. The alloy is distinguished by a very high resistance to oxidation, resistance to corrosion and good creep properties at high temperatures.

Nickel-based superalloy

A nickel-base superalloy with improved degradation behavior consists essentially of the following chemical composition (details in % by weight): 7.7-8.3 Cr, 5.0-5.25 Co, 2.0-2.1 Mo, 7.8-8.3 W, 5.8-6.1 Ta, 4.9-5.1 Al, 1.3-1.4 Ti, 0.1-0.6 Pt, 0.1-0.5 Nb, 0.11-0.15 Si, 0.11-0.15 Hf, 200-750 ppm C, 50-400 ppm B, and the remainder Ni and production-related impurities.

Nickel-base superalloy with improved degradation behavior

An iron-based high-temperature alloy has the following chemical composition (values given being in % by weight): The alloy can be produced at low cost and is distinguished in comparison with the known prior art by outstanding oxidation resistance and good mechanical properties at high temperatures up to 1000&#xb0; C.

High-temperature alloy

A creep-resistant steel is characterized by the following chemical composition (values in % by weight): 9.0 to 12.0 Cr, 0.1 to 0.5 Mn, 2.3 to 3 Ni, 1.5 to 2.0 Mo, 0.1 to 0.4 V, 0.01 to 0.06 Nb, 0.08 to 0.16 C, 0.02 to 0.08 N, 0.004 to 0.012 B, 0.001 to 2 Ta, 0.001 to 0.5 La, 0.0001 to 1 Pd, maximum 0.005 P, maximum 0.005 S, maximum 0.05 Si, maximum 0.005 Sn, the remainder iron and unavoidable impurities. This steel is distinguished, as compared with commercial steels, by a greatly improved creep behavior at temperatures of 550&#xb0; C. and above. Moreover, it has an improved resistance to embrittlement during long-term aging and comparatively high toughness. The steel is advantageously used as a material for gas turbine rotors which are exposed to high inlet temperatures in order to increase the efficiency of the gas turbine, but is also used for steam turbines.

Creep-resistant steel

A steel has the following chemical composition (amounts in % by weight): The steel can be used effectively as a welding additive material and has outstanding properties at very high temperatures, in particular a good creep rupture strength/resistance and a good oxidation resistance.

Welding additive material

A heat treatment method for a nickel-based superalloy, in particular for the production of single-crystal components or directionally solidified components having a chemical composition permits full solution annealing at a temperature T, the method comprising: partially solution annealing in a controlled manner at a temperature T&#x3c;Tin a first step so as to obtain 5-10% of undissolved &#x3b3;' phase in a residual eutectic; and performing a two-stage ageing treatment at respectively lower temperatures in a second step. As a function of the selected level of the partial solution annealing temperature, the proportion of the undissolved &#x3b3;&#x2032; phase can be adjusted in a controlled way, and the tolerance with respect to the disorientation of small-angle grain boundaries/grain boundaries can be increased.

Method for the heat treatment of nickel-based superalloys

A maraging heat-treatment steel includes 8.5 to 9.5% by weight of Cr, 0.15 to 0.25% by weight of Mn, 2 to 2.7% by weight of Ni, 0.5 to 2.5% by weight of Mo, 0.4 to 0.8% by weight of V, 0.001 to 0.15% by weight of Si, 0.06 to 0.1% by weight of C, 0.11 to 0.15% by weight of N, 0.02 to 0.04% by weight of Nb, maximum 0.007% by weight of P, maximum 0.005% by weight of S, maximum 0.01% by weight of Al, iron and standard impurities, wherein a weight ratio of vanadium to nitrogen V/N is in a range between 4.3 and 5.5.

Creep-resistant maraging heat-treatment steel

The invention discloses an intermetallic material consisting of the following composition by weight percent: 10% Al, 22% Cr, 36% Co, 0.2% Y, 0.2% Hf, 2% Ta, 3% Fe, remainder Ni and inevitable impurities. The invention also describes its use as a layer protecting against high temperatures and at locations of thermal turbomachines which are subject to friction or vibration.

Intermetallic material and use of this material

The invention relates to a hybrid blade () for thermal turbomachines, having an airfoil () made of a metallic material of a certain density, and having a blade root (). It is characterized in that the blade root (), compared with the airfoil (), is made of a different metallic material having a lower density, and in that the airfoil () is connected to the blade root () in a positive-locking manner. The blade in this case is advantageously a compressor blade, in particular a high-pressure compressor blade, in which the airfoil () is made of a stainless CrNi steel and the blade root () is made of a high-temperature titanium alloy or an intermetallic gamma titanium aluminide alloy or an intermetallic orthorhombic titanium aluminide alloy.

Hybrid blade for thermal turbomachines

The invention relates to a nickel-base superalloy for producing single-crystal components. The alloy according to the invention is characterized by the following chemical composition (details in % by weight): 7-13 Cr, 4-10 Co, 0.5-2 Mo, 2-8 W, 4-6 Ta, 3-6 Al, 1-4 Ti, 0.1-6 Ru, 0.01-0.5 Hf, 0.001-0.15 Si, 0-700 ppm C, 0-300 ppm B, remainder Ni and production-related impurities.

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Baden, Switzerland

Andreas Kuenzler