Nickel-iron-base alloy and process of forming a nickel-iron-base alloy

Abstract

A nickel-iron-base alloy has by weight about 0.06% to about 0.09% C, about 35% to about 37% Fe, about 12.0% to about 16.5% Cr, about 1.0% to about 2.0% Al, about 1.0% to about 3.0% Ti, about 1.5% to about 3.0% W, up to about 5.0% Mo, up to about 0.75% Nb, up to about 0.2% Mn, up to about 0.1% Si, up to about 0.006% B, and balance essentially Ni. A method for making the nickel-iron-base alloy is also disclosed.

1 . A nickel-iron-base alloy comprising by weight about 0.06% to about 0.09% C, about 35% to about 37% Fe, about 12.0% to about 16.5% Cr, about 1.0% to about 2.0% Al, about 1.0% to about 3.0% Ti, about 1.5% to about 3.0% W, up to about 5.0% Mo, up to about 0.75% Nb, up to about 0.2% Mn, up to about 0.1% Si, up to about 0.006% B, and balance essentially Ni. 
     
     
         2 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 2.0% to about 3.0% Ti, about 2.0% to about 3.0% W, about 3.0% to about 5.0% Mo, and up to about 0.1% Nb. 
     
     
         3 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 2.0% to about 3.0% Ti, about 1.5% to about 2.5 W, about 3.0% to about 5.0 Mo, and up to about 0.1% Nb. 
     
     
         4 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 2.0% to about 3.0% Ti, about 1.5% to about 2.5% W, about 0.5 to about 1.5% Mo, and up to about 0.1% Nb. 
     
     
         5 . The alloy of  claim 1 , comprising about 0.06% to about 0.08% C, about 1.0% to about 2.5 Ti, about 1.5% to about 2.5 W, up to about 0.25 Mo, and 0.25% to about 0.75 Nb. 
     
     
         6 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 12.0% to about 13.0% Cr, about 1.35% to about 1.65% Al, about 2.25% to about 2.75 Ti, about 2.3% to about 2.7% W, about 3.4% to about 3.6% Mo, up to about 0.1% Nb. 
     
     
         7 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 13.5% to about 14.5% Cr, about 1.35% to about 1.65% Al, about 2.25% to about 2.75 Ti, about 1.8% to about 2.2% W, about 3.9% to about 4.1% Mo, up to about 0.1% Nb. 
     
     
         8 . The alloy of  claim 1 , comprising about 0.07% to about 0.09% C, about 15.5% to about 16.5% Cr, about 1.35% to about 1.65% Al, about 2.25% to about 2.75 Ti, about 1.8% to about 2.2% W, about 0.9% to about 1.1% Mo, up to about 0.1% Nb. 
     
     
         9 . The alloy of  claim 1 , comprising about 0.06% to about 0.08% C, about 15.5% to about 16.5% Cr, about 1.35% to about 1.65% Al, about 1.5% to about 1.8% Ti, about 1.8% to about 2.2% W, up to about 0.12% Mo, about 0.4% to about 0.6% Nb. 
     
     
         10 . The alloy of  claim 1 , comprising about 0.08% C, about 36% Fe, about 12.5% Cr, about 1.50% Al, about 2.50 Ti, about 2.50 W, about 3.50 Mo, up to about 0.1% Nb. 
     
     
         11 . The alloy of  claim 1 , comprising about 0.08% C, about 36% Fe, about 14.0% Cr, about 1.50% Al, about 2.50% Ti, about 2.00% W, about 4.00% Mo, up to about 0.1% Nb. 
     
     
         12 . The alloy of  claim 1 , comprising about 0.08% C, about 36% Fe, about 16.0% Cr, about 1.50% Al, about 2.50% Ti, about 2.00% W, about 1.00% Mo, up to about 0.1% Nb. 
     
     
         13 . The alloy of  claim 1 , comprising about 0.07% C, about 37% Fe, about 16.0% Cr, about 1.50% Al, about 1.75 Ti, about 2.00% W, up to about 0.12% Mo, about 0.50% Nb. 
     
     
         14 . The alloy of  claim 1 , wherein the alloy has a solidification range of less than about 110° F., a gamma prime solvus of greater than about 1700° F., substantially no eta phase, a laves phase of less than about 5%, and a sigma phase of less than about 5%. 
     
     
         15 . The alloy of  claim 1 , wherein the composition is devoid of Co. 
     
     
         16 . The alloy of  claim 1 , wherein the modified alloy has a creep rupture life of about 25 ksi to about 30 ksi at about 1400° F. per 1000 hr. 
     
     
         17 . The alloy of  claim 1 , wherein the composition is a modification of a base alloy composition, the base alloy composition comprising about 0.05% C, about 0.20% Al, about 2.80% Ti, about 12.50% Cr, about 5.70 Mo, about 36% Fe and a second composition including about 16.00% Cr, about 37% Fe, about 2.90% Nb, about 1.75% Ti, about 0.20% Al, and about 0.02% C. 
     
     
         18 . A gas turbine component formed from the alloy of  claim 1 . 
     
     
         19 . A alloy, wherein the alloy has a solidification range of less than about 110° F., a gamma prime solvus of greater than about 1700° F., substantially no eta phase, a laves phase of less than about 5%, a sigma phase of less than about 5%, and is devoid of Co. 
     
     
         20 . A process of forming a modified alloy, the process comprising:
 providing a base alloy composition;   identifying a plurality of predetermined properties;   modifying the base alloy composition to form a modified alloy composition having the plurality of predetermined properties;   wherein the plurality of predetermined properties includes a solidification range of less than about 110° F., a gamma prime solvus of greater than about 1700° F., substantially no eta phase, a laves phase of less than about 5%, and a sigma phase of less than about 5%; and   wherein the base alloy composition comprises one or more of a first composition comprising about 0.05% C, about 36% Fe, about 12.50% Cr, about 0.20% Al, about 2.80% Ti, up to about 0.12% W, about 5.70% Mo, up to about 0.1% Nb, up to about 0.2% Mn, up to about 0.1% Si, up to about 0.006% B, balance essentially Ni and a second composition including about 0.02% C, about 37% Fe, 16.00% Cr, about 0.20% Al, about 1.75% Ti, up to about 0.12% W, up to about 0.12% Mo, about 2.90% Nb, up to about 0.2% Mn, up to about 0.1% Si, up to about 0.006% B, balance essentially Ni.