Monocrystalline nickel-base superalloy with Ti, Ta, and Hf carbi

Details Monocrystalline nickel-base superalloy with Ti, Ta, and Hf carbi Monocrystalline nickel-base superalloy with Ti, Ta, and Hf carbi

1996-10-25

1998-06-02

Phipps, Margery

Metal treatment

Stock

Directionally solidified

148410, 148428, 148562, 416241R, C22C 1905

Patent

active

057593019

ABSTRACT:
A nickel-base superalloy, in particular for the fabrication of large monocrystalline components, essentially comprises (measured in wt %): 6.0-6.8% of Cr, 8.0-10.0% of Co, 0.5-0.7% of Mo, 6.2-6.6% of W, 2.7-3.2% of Re, 5.4-5.8% of Al, 0.6-1.2% of Ti, 6.3-7.0% of Ta, 0.15-0.3% of Hf, 0.02-0.04% of C, 40-100 ppm of B. 15-50 ppm of Mg, the remainder being nickel with impurities. Carbides of Ta, Ti, and Hf, and Mg, and/or Mg--O--S compounds are concentrated along small angle grain boundaries of the superalloy.

REFERENCES:
patent: 5100484 (1992-03-01), Wukusick et al.
patent: 5470371 (1995-11-01), Darolia
patent: 5549756 (1996-08-01), Mihalisin et al.
"Development of Two Rhenium-Containing Superalloys for Single-Crystal Blade and Directionally Solidified Vane Applications in Advanced Turbine Engines", K. Harris, et al., Journal of Materials Engineering and Performance, Aug. 1993, No. 4, pp. 481-487.

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