Nickel base superalloy and single crystal castings

Abstract

Rhenium-bearing single crystal nickel base superalloy consisting essentially of, in weight %, about 12.5% to about 13.5% Cr, 9.0 to about 9.9% Co, about 4.7 to about 5.1% Ti, about 2.8 to about 3.2% Al, about 2.8 to about 4.3% W, about 1.4 to about 1.6% Mo, about 2.85 to about 3.1% Ta, about 1.0 to about 6.0% Re, about 0.08 to about 0.11% C, about 0.010 to about 0.015% B, up to about 0.15% Nb, up to about 0.15% Hf, up to about 0.003% Zr, and balance Ni and incidental impurities.

1 . Nickel base superalloy consisting essentially of, in weight %, about 12.5% to about 13.5% Cr, 9.0 to about 9.9% Co, about 4.7 to about 5.1% Ti, about 2.8 to about 3.2% Al, about 2.8 to about 4.3% W, about 1.4 to about 1.6% Mo, about 2.85 to about 3.1% Ta, about 1.0 to about 6.0% Re, about 0.08 to about 0.11% C, about 0.010 to about 0.015% B, up to about 0.15% Nb, up to about 0.15% Hf, up to about 0.003% Zr, and balance Ni and incidental impurities.  
     
     
         2 . The superalloy of  claim 1  having a Re content of about 2 to about 4 weight %.  
     
     
         3 . The superalloy of  claim 2  having an N v  value of less than 2.37.  
     
     
         4 . Nickel base superalloy consisting essentially of, in weight %, about 13.0% Cr, 9.0% Co, about 4.9% Ti, about 3.0% Al, about 3.03% W, about 1.5% Mo, about 2.95% Ta, about 3.0% Re, about 0.09% C, about 0.012% B, up to about 0.15% Nb, up to about 0.15% Hf, up to about 0.003% Zr, and balance Ni and incidental impurities and an N v  of about 2.33.  
     
     
         5 . A turbine airfoil comprising the superalloy of claims  1 ,  2 ,  3 , or  4 .  
     
     
         6 . A turbine airfoil of  claim 5  which is a directionally solidified columnar grain or single crystal cast airfoil.  
     
     
         7 . Nickel base superalloy consisting essentially of, in weight %, about 9.5% to about 14.0% Cr, 7.0 to about 11.0% Co, about 3.0 to about 5.0% Ti, about 3.0 to about 4.0% Al, about 3.0 to about 4.0% W, about 1.0 to about 2.5% Mo, about 1.0 to about 4.0% Ta, about 1.0 to about 6.0% Re, up to about 0.25% C, up to about 0.015% B, up to about 1.0% Nb, up to about 0.15% Hf, up to about 0.003% Zr, and balance Ni and incidental impurities.  
     
     
         8 . The superalloy of  claim 7  having a Re content of about 2 to about 4 weight %.  
     
     
         9 . The superalloy of  claim 8  having an N v  value of less than 2.37.  
     
     
         10 . Nickel base superalloy consisting essentially of, in weight %, about 11.75% Cr, 9.0% Co, about 4.0% Ti, about 3.5% Al, about 3.5% W, about 1.75% Mo, about 2.5% Ta, about 3.0% Re, about 0.09% C, up to about 0.012% B, up to about 0.15% Nb, up to about 0.15% Hf, up to about 0.003% Zr, and balance Ni and incidental impurities and an N v  of about 2.33.  
     
     
         11 . A turbine airfoil comprising the superalloy of claims  7 ,  8 ,  9 , or  10 .  
     
     
         12 . A turbine airfoil of  claim 11  which is a single crystal cast airfoil.