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Superalloys and parts formed therefrom

A superalloy, nickel-based superalloy technology, applied in the nickel-based superalloy to show improved high temperature holding pressure, nickel-based superalloy field, can solve the complex, creep and crack growth characteristics, it is difficult to improve creep at the same time and crack growth characteristics to achieve good thermal stability and good productivity

Active Publication Date: 2018-05-22
GENERAL ELECTRIC CO
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Problems solved by technology

However, this challenge is complicated by the fact that simultaneous improvement of creep and crack growth characteristics is difficult and can be affected by the presence or absence of certain alloy constituents and the levels of alloy constituents present in superalloys. Relatively small changes can significantly affect

Method used

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  • Superalloys and parts formed therefrom
  • Superalloys and parts formed therefrom
  • Superalloys and parts formed therefrom

Examples

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Embodiment Construction

[0020] The present invention relates to γ′ nickel-based superalloys, and in particular those γ′ nickel-based superalloys suitable for use in components produced by hot working operations such as forging to have a polycrystalline microstructure. figure 1 A specific example shown in is a high pressure turbine disk 10 for a gas turbine engine. The present invention will be discussed with reference to the machining of high-pressure turbine disks for gas turbine engines, although those skilled in the art will appreciate that the teachings and benefits of the present invention are also applicable to compressor disks and blisks for gas turbine engines, as well as those subjected to high temperatures. Many other components that are stressed and therefore require high temperature pressure holding capabilities.

[0021] figure 1Discs of the type shown in are typically produced by isothermally forging fine-grained billets formed by powder metallurgy (PM), casting and forging processes o...

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Abstract

The present invention relates to gamma' nickel-based superalloys and components formed therefrom that exhibit improved high temperature pressure holding capabilities, including creep and residence time fatigue crack growth behavior. A specific example of a component is a powder metallurgy turbine disk for a gas turbine engine. The gamma' nickel-based superalloy comprises by weight: 16.0-30.0% cobalt; 9.5-12.5% ​​chromium; 4.0-6.0% tantalum; 2.0-4.0% aluminum; 2.0-3.4% titanium; 3.0-6.0% tungsten; ‑4.0% molybdenum; 1.5‑3.5% niobium; up to 1.0% hafnium; 0.02‑0.20% carbon; 0.01‑0.05% boron; 0.02‑0.10% zirconium; balance essentially nickel and impurities. The superalloy has a W+Nb-Cr value of at least -6, is free of observable amounts of sigma and eta phases, and has a time to 0.2% creep of at least 1000 hours at 1300°F and 100 ksi.

Description

[0001] Related Application Cross Reference [0002] This is a continuation-in-part of co-pending US Patent Application Serial No. 12 / 474580, filed May 29, 2009 and published as US Patent Application Publication No. 2010 / 0303665 to Bain et al. The content of this prior application is incorporated herein by reference. Background of the invention [0003] The present invention relates generally to nickel-based alloy compositions, and more particularly to nickel-based superalloys suitable for use in components requiring polycrystalline microstructures and high temperature residence time (pressure holding) capabilities, such as turbine disks for gas turbine engines. alloy. [0004] The turbine section of a gas turbine engine is located downstream of the combustor section and includes a rotating shaft and one or more turbine stages, each turbine stage having a turbine disk (rotor) mounted or otherwise driven by the shaft and The periphery of the radially extending turbine vane. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/056C22C19/057C22F1/10
Inventor D.P.穆雷尔R.迪多米齐奥T.汉伦D.Y.魏A.E.维斯曼K.R.拜恩A.M.鲍威尔
Owner GENERAL ELECTRIC CO
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