Directionally solidified casting with improved transverse stress rupture strength
OwnerJohn Corrigan, Russell G. Vogt +5inventors
InventorsJohn Corrigan, Russell G. Vogt, John R. Mihalisin, John K. Bennett, Uwe Paul, Christoph Mayr, Winfried Esser
Life of this patent
Estimating the term…
Abstract
Directionally solidified columnar grain nickel base alloy casting consisting essentially of, in weight %, of about 11.6% to 12.70% Cr, about 8.50 to 9.5% Co, about 1.65% to 2.15% Mo, about 3.5% to 4.10% W, about 4.80% to 5.20% Ta, about 3.40 to 3.80% Al, about 3.9% to 4.25% Ti, about 0.05% to 0.11% C, about 0.003% to 0.015% B, balance essentially Ni and having substantial transverse stress rupture strength and ductility as compared to a similar casting without boron present.
Claims4
A method of making a directionally solidified casting, comprising introducing into a mold an alloy consisting essentially of, in weight %, about 9.5% to about 14% Cr, about 7% to about 11% Co, about 1% to about 2.5% Mo, about 3% to about 6% W, about 1% to about 6% Ta, about 3 to about 4% Al, about 3% to about 5% Ti, about 0 to about 1% Nb and balance essentially Ni and B in an amount of about 0.003% to about 0.015% B, and directionally solidifying the alloy in the mold to form a columnar grain casting having a plurality of columnar grains along an axis of the casting and having transverse stress rupture strength and ductility so improved that said casting is useful as a columnar grain gas turbine engine blade.
(canceled)
A method making a directionally solidified casting, comprising providing a nickel base alloy consisting essentially of, in weight %, about 11.6% to about 12.70% Cr, about 8.50 to about 9.5% Co, about 1.65% to about 2.15% Mo, about 3.5% to about 4.10% W, about 4.80% to about 5.20% Ta, about 3.40 to about 3.80% Al, about 3.9% to about 4.25% Ti, about 0.05% to about 0.11% C, about 0.010% to about 0.015% B, and balance essentially Ni, introducing the alloy into a mold, and solidifying the alloy in the mold to form a casting having a plurality of columnar grains along an axis of the casting, having a directionally solidified columnar grain microstructure and having transverse stress rupture strength and ductility so improved that said casting is useful as a columnar grain gas turbine engine blade.
Dependencies are inferred from the claim text.