Cobalt-nickel superalloys, and related articles

A technology of cobalt-nickel alloy and alloy, which is applied in the field of cobalt-nickel alloy and can solve problems such as reduction

Inactive Publication Date: 2011-11-09
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the γ′-Co 3 In Co-Al-W-based alloys with (Al, W) phase precipitation, the addition of Cr will reduce the γ′-Co 3 Phase stability of (Al, W) phase

Method used

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  • Cobalt-nickel superalloys, and related articles
  • Cobalt-nickel superalloys, and related articles
  • Cobalt-nickel superalloys, and related articles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] The examples provided below are illustrative only and should not be construed as any limitation on the scope of the claimed invention.

[0078] The alloy composition was chosen based on the conventional cobalt-based alloy Haynes 188 consisting essentially of Co-22%Cr-22%Ni-14%W-3%Fe-0.1%C. 2-5 wt% Al was added to Co-22%Cr-22%Ni-14%W and Co-16%Cr-22%Ni-14%W. In addition, 1-2% by weight of Ta is added to Co-22%Cr-22%Ni-14%W-4%Al and Co-16%Cr-22%Ni-14%W-4%Al. The addition of 4% Al makes an alloy with a high Ni content.

[0079] Table 1 Composition

[0080]

[0081] One pound ingots of each alloy were prepared by induction melting. The alloy was solution treated at 1200°C for 6 hours, followed by air cooling. Two pieces cut from each alloy were aged at 900° C. and 1000° C. for 100 hours, respectively. Aging is done by air cooling. Transmission electron microscopy and scanning electron microscopy were performed to examine γ′-(Co,Ni) 3 (Al,W) phase exists. Differen...

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PUM

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Abstract

A cobalt-nickel alloy composition is disclosed comprising, by weight about 30% to about 50% cobalt, about 20% to about 40% nickel, at least about 10% chromium, aluminum; and at least one refractory metal. Moreover, the alloy composition comprises an L12-structured [gamma]' phase having the formula (Co, Ni)3(Al,Z), wherein Z is at least one refractory metal. Various components made from, or cladded with, the cobalt-nickel alloy compositions are also described.

Description

technical field [0001] In general, the present invention relates to metal alloy compositions. More specifically, the present invention relates to cobalt-nickel alloys, and related articles, useful in high temperature structural applications where good high temperature creep strength and environmental resistance, particularly sulfidation resistance, are required. Background technique [0002] Superalloys are often the material of choice for components used in high temperature environments. (The term "superalloy" is generally used to cover composite nickel-, iron- or cobalt-based alloys for high temperature applications that contain one or more other elements such as aluminum (Al) and chromium (Cr)). For example, many hot gas path components in aircraft engines, industrial gas turbines, and gasification systems are often formed from nickel- or cobalt-based superalloys because they need to maintain their mechanical and / or environmental integrity at high temperatures. Such all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C19/07
CPCC22F1/10C22C19/055C22C19/07C22C19/05C22F1/00Y10T428/12861Y10T428/12493C22C19/03
Inventor A·苏祖基M·M·莫拉M·拉森
Owner GENERAL ELECTRIC CO
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