Super oxidation and cyclic damage resistant nickel-base superalloy and articles formed therefrom

Abstract

A nickel-base superalloy composition including (measured in % by weight) from about 6.8 to about 7.5% aluminum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, from 0 to about 6% rhenium, from 0 to about 5% cobalt, from 0 to about 0.2% silicon, optionally, from about 0.15 to about 0.7% hafnium, from 0 to about 0.5% titanium, from 0 to about 4% molybdenum, from 0 to about 0.005% boron, from 0 to about 0.06% carbon, from 0 to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combinations thereof, balance nickel and incidental impurities. The nickel-base superalloy composition may be used in single-crystal or directionally solidified superalloy articles such as high pressure turbine blades for a gas turbine engine.

1 . A composition of matter consisting essentially of, in weight percent, from about 6.8 to about 7.5% aluminum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, from 0 to about 6% rhenium, from 0 to about 5% cobalt, from 0 to about 0.2% silicon, optionally, from about 0.15 to about 0.7% hafnium, from 0 to about 0.5% titanium, from 0 to about 4% molybdenum, from 0 to about 0.005% boron, from 0 to about 0.06% carbon, from 0 to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combinations thereof, balance nickel and incidental impurities. 
     
     
         2 . The composition of matter according to  claim 1 , wherein the composition includes from about 6.8 to about 7.2 wt % aluminum. 
     
     
         3 . The composition of matter according to  claim 1 , wherein the composition includes from about 4 to about 7.5 wt % chromium. 
     
     
         4 . The composition of matter according to  claim 1 , wherein the composition includes, in weight percent, from about 6.8 to about 7.2% aluminum, from about 4.5 to about 6.4% tantalum, about 7.5% chromium, about 3.85% tungsten, from about 1.6 to about 3.0% rhenium, about 3.1% cobalt, and about 0.05% silicon. 
     
     
         5 . The composition of matter according to  claim 1  wherein a total of tungsten, rhenium, and molybdenum is in a range of from about 6 to about 8 wt %. 
     
     
         6 . The composition of matter according to  claim 4  wherein a total of tungsten, rhenium, and molybdenum is in a range of from about 6 to about 8 wt %. 
     
     
         7 . The composition of matter according to  claim 1  having a density within a range of about 0.3 to about 0.315 lb/in 3 , inclusive. 
     
     
         8 . A composition of matter consisting essentially of, in weight percent, from about 6.8 to about 7.5% aluminum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, up to about 6% rhenium, up to about 5% cobalt, up to about 0.2% silicon, from about 0.15 to about 0.7% hafnium, optionally, up to about 0.5% titanium, optionally, up to about 4% molybdenum, optionally, up to about 0.005% boron, optionally, up to about 0.06% carbon, optionally, up to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combinations thereof, balance nickel and incidental impurities. 
     
     
         9 . The composition of matter according to  claim 8  wherein a total of tungsten, rhenium, and molybdenum is in a range of from about 6 to about 8 wt %. 
     
     
         10 . The composition of matter according to  claim 8  wherein the composition includes from about 6 to about 7 wt % chromium. 
     
     
         11 . An article comprising a substantially single crystal having a composition consisting essentially of, in weight percent, from about 6.8 to about 7.5% aluminum, from about 4 to about 8% tantalum, from about 4 to about 10% chromium, from about 2 to about 7% tungsten, from 0 to about 6% rhenium, from 0 to about 5% cobalt, from 0 to about 0.2% silicon, optionally, from about 0.15 to about 0.7% hafnium, from 0 to about 0.5% titanium, from 0 to about 4% molybdenum, from 0 to about 0.005% boron, from 0 to about 0.06% carbon, from 0 to about 0.03% of a rare earth addition selected from the group consisting of yttrium, lanthanum, cesium, and combinations thereof, balance nickel and incidental impurities. 
     
     
         12 . The article according to  claim 11  comprising a single-crystal component. 
     
     
         13 . The article according to  claim 12  wherein the single-crystal component comprises a blade of a gas turbine. 
     
     
         14 . The article according to  claim 11  comprising a component of a gas turbine engine selected from a nozzle, a shroud, a splash plate, and a combustor component. 
     
     
         15 . The article according to  claim 11  comprising a directionally solidified component. 
     
     
         16 . The article according to  claim 15  wherein the directionally solidified component comprises a blade of a gas turbine. 
     
     
         17 . The article according to  claim 11  comprising from about 6 to about 7 wt % chromium.