Corrosion Resistant Alloy Compositions with Enhanced Castability and Mechanical Properties

a technology of alloy compositions and mechanical properties, applied in the field of alloys, can solve the problems of sacrificing hot corrosion resistance and thermo-mechanical fatigue resistance, and increasing the cost of alloys with greater hot corrosion resistan

Inactive Publication Date: 2009-02-12
SIEMENS ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The greatest difficulty encountered with the gas turbine environment is that the goals of creep resistance, thermo-mechanical fatigue resistance, and corrosion resistance are at odds with each other.
Alloys with greater creep resistance typically sacrifice hot corrosion resistance and thermo-mechanical fatigue resistance.
Alloys with greater hot corrosion resistance come at the expense of poor creep resistance and thermo-mechanical fatigue resistance.

Method used

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  • Corrosion Resistant Alloy Compositions with Enhanced Castability and Mechanical Properties
  • Corrosion Resistant Alloy Compositions with Enhanced Castability and Mechanical Properties

Examples

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Embodiment Construction

[0011]The present invention provides an alloy composition that may be cast as a single crystal alloy or may be directionally solidified, and that has better castability than the prior art alloy available from Cannon-Muskegon Corporation under the registered trademark CMSX-4, has better corrosion resistance than alloy CM247LC available from that same source, and has better mechanical properties than the prior art alloy available through United Technologies Corporation under the trademark PWA 1483. Typical weight percent compositions of these prior art alloys are shown in Table 1.

TABLE 1CMSX-4PWA 1483CM247LCMinMaxMinMaxMinMaxCo9.310.08.59.59.09.5Cr6.46.611.612.78.08.5Ti0.91.13.94.250.60.9Al5.45.753.43.85.45.7Ta6.36.754.85.23.13.3Mo0.50.71.652.150.40.6W6.26.63.54.19.39.7Hf0.070.12075 ppm1.01.6Re2.83.1————C060 ppm0.050.090.070.08B025 ppm030 ppm.01.02Zr075 ppm075 ppm.0050.02

[0012]The novel alloy compositions disclosed herein offer an improved set of properties that are particularly usefu...

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Abstract

Disclosed are novel nickel-base alloy compositions that may be cast as a single crystal or directionally solidified alloy consisting essentially of, by weight: 8-12% Cr, 10-14% Co, 0.3-0.9% Mo, 3-7% W, 2-8% Ta, 2.0-5.5% Al, 1.5-5.0% Ti, up to 2% Nb, less than 0.1% B, less than 0.1% Zr, 0.05-0.15% C, less than 0.5% Hf, 2-4% Re, 0.05-0.2% Si, up to 0.015% S, up to 0.1% La, up to 0.1% Y, up to 0.1% Ce, up to 0.1% Nd, up to 0.1% Dy, up to 0.1% Pr, up to 0.1% Gd, balance is Ni, and wherein (La+Y+Ce+Nd+Dy+Pr+Gd) is 0.001-0.1%. The compositions for the nickel-base superalloy have a balance between oxidation resistance, corrosion resistance, castability, and mechanical properties, such as creep resistance and thermo-mechanical fatigue resistance.

Description

[0001]This application claims benefit of the 10 Aug. 2007 filing date of U.S. Provisional Patent Application No. 60 / 955,092.FIELD OF THE INVENTION[0002]This invention relates in general to the field of nickel base superalloys possessing improved oxidation resistance, corrosion resistance, castability, and mechanical properties such as creep resistance and thermo-mechanical fatigue resistance. The present invention relates to alloys that may be cast as a single crystal or directionally solidified.BACKGROUND OF THE INVENTION[0003]Nickel base superalloys are alloys composed primarily of nickel with the addition of several other elements selected for their ability to survive an overall high temperature, high stress, and highly oxidative environment. Typically, this environment is that of a gas turbine engine.[0004]The greatest difficulty encountered with the gas turbine environment is that the goals of creep resistance, thermo-mechanical fatigue resistance, and corrosion resistance are ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C19/05
CPCC22C19/056C22C30/00C22C19/057
Inventor JAMES, ALLISTER W.FUCHS, GERHARD E.ARRELL, DOUGLAS J.
Owner SIEMENS ENERGY INC
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