(19)
(11) EP 1 329 527 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.10.2003 Bulletin 2003/43

(43) Date of publication A2:
23.07.2003 Bulletin 2003/30

(21) Application number: 02258710.9

(22) Date of filing: 18.12.2002
(51) International Patent Classification (IPC)7: C22C 19/03, C22C 19/05, C22F 1/10
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR
Designated Extension States:
AL LT LV MK RO

(30) Priority: 18.12.2001 US 23565

(71) Applicant: UNITED TECHNOLOGIES CORPORATION
Hartford, CT 06101 (US)

(72) Inventors:
  • Cetel, Alan D.
    West Hartford, CT 06117 (US)
  • Shah, Dilip M.
    Glastonbury, CT 06033 (US)

(74) Representative: Hall, Matthew Benjamin 
Frank B. Dehn & Co. 179 Queen Victoria Street
London EC4V 4EL
London EC4V 4EL (GB)

   


(54) High strength hot corrosion and oxidation resistant, directionally solidified nickel base superalloy and articles


(57) Corrosion and oxidation resistant, high strength, directionally solidified superalloy alloys and articles are described. The articles have a nominal composition in weight percent of about 12% Cr, 9% Co, 1.9% Mo, 3.8% W, 5% Ta, 3.6% Al, 4.1% Ti, 0.015% B, 0.1 % C, up to about 0.02 Zr, balance essentially nickel, and include no intentional additions of hafnium or zirconium, and also have a small amounts of tantalum carbide. The resultant articles have good hot corrosion resistance and superior oxidation resistance and creep properties. The articles are preferably columnar grain, but may also be single crystal.






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