Method of controlling and refining final grain size in supersolvus heat treated nickel-base superalloys

a superalloy and heat treatment technology, applied in the field of processing nickelbase superalloys, can solve the problems of less than optimal mechanical properties, prone to critical grain growth, and affecting other mechanical properties, and achieves high local strain rate and high carbon conten

Inactive Publication Date: 2009-01-01
GENERAL ELECTRIC CO
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Benefits of technology

[0010]The present invention provides a method of forming components from gamma prime nickel-base superalloys. The method entails formulating such a superalloy to have a sufficiently high carbon content and forging the superalloy at sufficiently high local strain rates so that, following a supersolvus heat treatment, the component is characterized by a fine and substantially uniform grain size distribution, preferably an average grain size finer than ASTM 7

Problems solved by technology

Critical grain growth can also have a negative impact on other mechanical properties, such as tensile strength.
Though not wishing to be held to any particular theory, critical grain growth is believed to be driven by excessive stored energy within the worked article, and may involve individual grains, multiple individual grains within a small region, or large areas of adjacent grains.
Disks and other critical gas turbine engine components forged from billets produced by powder me

Method used

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  • Method of controlling and refining final grain size in supersolvus heat treated nickel-base superalloys
  • Method of controlling and refining final grain size in supersolvus heat treated nickel-base superalloys
  • Method of controlling and refining final grain size in supersolvus heat treated nickel-base superalloys

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Embodiment Construction

[0022]The present invention is particularly directed to components formed by forging gamma prime precipitation-strengthened nickel-base superalloys. A particular example is high pressure turbine disks of gas turbine engines, which are typically formed by isothermally forging a fine-grained billet at temperatures at or near the recrystallization temperature of the alloy but less than the gamma prime solvus temperature of the alloy, and under superplastic forming conditions to enable filling of the forging die cavity through the accumulation of high geometric strains without the accumulation of significant metallurgical strains. After forging, a supersolvus heat treatment is performed, during which grain growth occurs. In the past, such a supersolvus heat treatment has typically yielded an acceptable but not wholly optimal average grain size range of about ASTM 2 to 9. In accordance with commonly-assigned U.S. Pat. No. 4,957,567 to Krueger et al., U.S. Pat. No. 5,529,643 to Yoon et al...

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Abstract

A method of forming a component from a gamma prime precipitation-strengthened nickel-base superalloy. The method entails formulating the superalloy to have a sufficiently high carbon content and forging the superalloy at sufficiently high local strain rates so that, following a supersolvus heat treatment, the component is characterized by a fine and substantially uniform grain size distribution, preferably finer than ASTM 7 and more preferably in a range of about ASTM 8 to 10.

Description

BACKGROUND OF THE INVENTION[0001]The present invention generally relates to methods for processing nickel-base superalloys. More particularly, this invention relates to a method of forging an article from a nickel-base superalloy, in which increased local strain rates in combination with increased carbon content promote a more controlled grain growth during supersolvus heat treatment, such that the article is characterized by a microstructure with a finer uniform grain size.[0002]Gamma prime (γ′) precipitation-strengthened nickel-base superalloys contain chromium, tungsten, molybdenum, rhenium and / or cobalt as principal elements that combine with nickel to form the gamma (γ) matrix, and contain aluminum, titanium, tantalum, niobium, and / or vanadium as principal elements that combine with nickel to form the desirable gamma prime precipitate strengthening phase, principally Ni3(Al, Ti). Gamma prime precipitation-strengthened nickel-base superalloys (hereinafter, gamma prime nickel-bas...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/05
CPCC22C19/056C22F1/10C22C19/057
Inventor HURON, ERIC SCOTTHEANEY, JOSEPH ALOYSIUSMOURER, DAVID PAULGROH, JON RAYMONDRAYMOND, EDWARD LEEUTAH, DAVID ALANWEIMER, MICHAEL JAMESBAIN, KENNETH REES
Owner GENERAL ELECTRIC CO
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