A nickel-based alloy

Abstract

A nickel-based alloy composition consisting, in weight percent, of: between 9.0 and 13.2% chromium, between 5.9 and 24.9% cobalt, between 0.0 and 4.0% iron, between 1.1 and 4.4% molybdenum, between 0.0 and 8.0% tungsten, between 2.8 and 3.7% aluminium, between 0.3 and 5.1% titanium, between 0.0 and 4.0% niobium, more than 2.4% tantalum and 9.5% or less tantalum, between 0.01 and 0.1% carbon, between 0.001 and 0.1% boron, between 0.001 and 0.3% zirconium, between 0.0 and 0.5% silicon, between 0.0 and 0.1% yttrium, between 0.0 and 0.1% lanthanum, between 0.0 and 0.1% cerium, between 0.0 and 0.003% sulphur, between 0.0 and 0.25% manganese, between 0.0 and 0.5% vanadium, between 0.0 and 0.5% copper, and between 0.0 and 0.5% hafnium, the balance being nickel and incidental impurities, wherein the following equations are satisfied in which W MO , W w , W Nb , W- Ta and W Ti are the weight percent of molybdenum, tungsten, niobium, tantalum and titanium in the alloy respectively 1.29W Mo +0.5W w ≥5.7, 0.6W Ti +0.44W Nb +0.27 W Ta ≥4.2.

1 . A nickel-based alloy composition consisting, in weight percent, of:
 9.0 to 13.2% chromium, 5.9 to 24.9% cobalt, 0.0 to 4.0% iron, 1.1 to 4.4% molybdenum, 0.0 to 8.0% tungsten, 2.8 to 3.7% aluminium, 0.3 to 5.1% titanium, 0.0 to 4.0% niobium, more than 2.4% tantalum and 9.5% or less tantalum, 0.01 to 0.1% carbon, 0.001 to 0.1% boron, 0.001 to 0.3% zirconium, 0.0 to 0.5% silicon, 0.0 to 0.1% yttrium, 0.0 to 0.1% lanthanum, 0.0 to 0.1% cerium, 0.0 to 0.003% sulphur, 0.0 to 0.25% manganese, 0.0 to 0.5% vanadium, 0.0 to 0.5% copper, and 0.0 to 0.5% hafnium, the balance being nickel and incidental impurities,   
       wherein the following equations are satisfied in which W Mo , W w , W Nb , W Ta  and W Ti  are the weight percent of molybdenum, tungsten, niobium, tantalum and titanium in the alloy respectively
   29 W   Mo 0+0.5 W   w ≥5.7
 
   0.6 W   Ti +0.44 W   Nb +0.27 W   Ta ≥4.2.
 
 
     
     
         2 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W Nb , W Ta , W Ti  and W Al  are the weight percent of niobium, tantalum, titanium and aluminium in the alloy respectively
   6.2≤0.6 W   Ti +0.31 W   Nb +0.15 W   Ta +0.94 W   Al ≤7.4
     preferbly 6.2≤0.6 W   Ti +0.31 W   Nb +0.15 W   Ta +0.94 W   Al ≤6.7
   
     
     
         3 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W Nb , W Ta , W Ti  and W Al  are the weight percent of niobium, tantalum, titanium and aluminium in the alloy respectively
   1.0≤(0.6 W   Ti +0.31 W   Nb +0.15 W   Ta )/ W   Al ≤1.3
   
     
     
         4 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W W  and W Mo  are the weight percent of tungsten and molybdenum, in the alloy respectively
   6.0≤1.29 W   Mo +0.5 W   W  
   
     
     
         5 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W Ta  and W W  are the weight percent of tantalum and tungsten, in the alloy respectively
     W   Ta +0.88 W   W ≤9.4
   
     
     
         6 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W Ta  and W Co  are the weight percent of tantalum and cobalt, in the alloy respectively
     W   Ta +0.47 W   Co ≤14.1
   
     
     
         7 . The nickel-based alloy composition of  claim 1 , wherein the following equation is satisfied in which W W , W Mo  and W Cr  are the weight percent of tungsten and chromium and molybdenum, in the alloy respectively
     W   W +1.62 W   Cr +2.0 W   Mo ≤30.2
     preferably  W   W +1.62 W   Cr +2.0 W   Mo ≤28.3
   
     
     
         8 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 3.5 wt. % or less aluminium, preferably 3.1 wt. % or less aluminium. 
     
     
         9 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 2.45 wt. % or more tantalum, preferably 2.5 wt. % or more tantalum, more preferably 3.4 wt. % or more tantalum, even more preferably 5.1 wt. % or more tantalum. 
     
     
         10 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 6.4 wt. % or less tantalum 
     
     
         11 . (canceled) 
     
     
         12 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 3.0 wt. % or less niobium, preferably 2.0 wt. % or less niobium. 
     
     
         13 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 1.1 wt. % or more of titanium, preferably 1.8 wt. % or more titanium. 
     
     
         14 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 4.8 wt. % or less titanium, preferably 4.6 wt. % or less titanium, more preferably 4.2 wt. % or less titanium. 
     
     
         15 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 3.2 wt. % or more tungsten. 
     
     
         16 . (canceled) 
     
     
         17 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 1.2 wt. % or more molybdenum, preferably 1.7 wt. % or more molybdenum. 
     
     
         18 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 6.1 wt. % or more cobalt, preferably 7.1 wt. % or more cobalt. 
     
     
         19 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 24.6 wt. % or less cobalt, preferably 22.8 wt. % or less cobalt, more preferably 19.1 wt. % or even 16.8 wt % or 16.6 wt. % or less cobalt, even more preferably 14.7 wt. % or less cobalt, most preferably 11.1 wt. % or less cobalt. 
     
     
         20 . The nickel-based alloy composition of  claim 1 , consisting of, in weight percent, 11.9 wt. % or less chromium, preferably 11.5 wt. % or less chromium, more preferably 11.2 wt. % or less chromium. 
     
     
         21 . The nickel-based alloy composition of  claim 1 , consisting of, 51-62% volume fraction gamma prime at 850° C., preferably 51-56% volume fraction gamma prime at 850° C. 
     
     
         22 . A powder of the nickel-based alloy composition of  claim 1 . 
     
     
         23 .- 25 . (canceled)