Nickel base alloy

A technology of nickel-based alloys and alloys, used in machines/engines, stators, mechanical equipment, etc., can solve the problem of high cost

Inactive Publication Date: 2007-12-26
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current concern is to reduce the use of tantalum due to its high cost

Method used

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  • Nickel base alloy
  • Nickel base alloy
  • Nickel base alloy

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Embodiment Construction

[0012] The present invention is the result of an effort to develop a nickel-based alloy with properties comparable to that marketed as GTD-222 and disclosed in U.S. Patent No. 4,810,467, which is disclosed here For reference, but its chemical composition is carefully balanced to reduce or completely eliminate tantalum. This research led to the development of nickel-based alloys with properties particularly suited to nozzles used in the second or third turbine stages of gas turbine engines. Therefore, specific properties of interest include creep strength, weldability, fatigue life, castability, metallurgical stability and oxidation resistance. As a result of this study, the niobium content was increased to replace the absence of tantalum, thus fundamentally altering the two trace alloying elements in GTD-222 known to affect the gamma primary dispersion strengthening phase.

[0013] The high-temperature strength of nickel-based superalloys is directly related to the volume fra...

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Abstract

A castable and weldable nickel-base alloy that exhibits a desirable balance of strength and resistance to corrosion and oxidation suitable for gas turbine engine applications. A suitable composition for the alloy consists essentially of, by weight, 10% to 25% cobalt, 20% to 28% chromium, 1% to 3% tungsten, 0.5% to 1.5% aluminum, 1.5% to 2.8% titanium, 0.8% to 1.45% columbium, tantalum in an amount less than columbium and Cb+0.508Ta is 1.15% to 1.45%, 0.001% to 0.025% boron, up to 0.4% zirconium, 0.02% to 0.15% carbon, with the balance essentially nickel and incidental impurities.

Description

technical field [0001] The present invention relates generally to nickel-based alloys. More particularly, the present invention relates to castable and weldable nickel-based alloys exhibiting desirable properties suitable for use in gas turbine engine applications. Background technique [0002] The superalloy GTD-222 (US Patent No. 4,810,467) has many desirable properties suitable for use in gas turbine engine applications, such as nozzles (blades) used in the latter (second and third) stages of the turbine section. The nominal composition (by weight) of GTD-222 is: about 19% Cobalt, about 22.5% Chromium, about 2% Tungsten, about 1.2% Aluminum, about 2.3% Titanium, about 3.5% Al +Ti, about 0.8% columbium (niobium), about 1.0% tantalum, about 0.01% boron, about 0.01% zirconium, about 0.1% carbon, and the rest is mainly nickel and incidental impurities. Like other nickel-based alloys Like the composition, the improvement of GTD-222 includes careful and controllable adjustment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C19/03F01D9/02F02C7/00
CPCC22C19/055C22C19/03
Inventor J·H·沃德G·冯C·G·贝克
Owner GENERAL ELECTRIC CO
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