(19) |
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(11) |
EP 1 640 465 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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05.04.2006 Bulletin 2006/14 |
(43) |
Date of publication A2: |
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29.03.2006 Bulletin 2006/13 |
(22) |
Date of filing: 30.08.2005 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
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Designated Extension States: |
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AL BA HR MK YU |
(30) |
Priority: |
03.09.2004 US 934920
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(71) |
Applicant: HAYNES INTERNATIONAL, INC. |
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Kokomo,
Indiana 46904-9013 (US) |
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(72) |
Inventor: |
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- Pike, Lee M. Jr.
Kokomo
Indiana 46901 (US)
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(74) |
Representative: Fuchs Mehler Weiss & Fritzsche |
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Naupliastrasse 110 81545 München 81545 München (DE) |
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(54) |
Ni-Cr-Co-Mo alloy for advanced gas turbine engines |
(57) A wrought age-hardenable nickel-chromium-cobalt based alloy suitable for use in high
temperature gas turbine transition ducts possessing a combination of three specific
key properties, namely resistance to strain age cracking, good thermal stability,
and good creep-rupture strength contains in weight percent 17 to 22 chromium, 8 to
15 cobalt, 4.0 to 9.5 molybdenum, up to 7 tungsten, 1.28 to 1.65 aluminum, 1.50 to
2.30 titanium, up to 0.80 niobium, 0.01 to 0.2 carbon, up to 0.01 boron, and up to
3 iron, with a balance of nickel and impurities. Certain alloying elements must be
present in amounts according to two equations here disclosed.