Stable, high-temperature nickel-base superalloy and single-crystal articles utilizing the superalloy

Abstract

An article includes a substantially single crystal piece having a composition consisting essentially of, in weight percent, from 0.4 to 6.5 percent ruthenium, from 3 to 8 percent rhenium, from 5.8 to 10.7 percent tantalum, from 4.25 to 17.0 percent cobalt, from 0.1 to 2.0 percent hafnium, from 0.02 to 0.4 percent carbon, from 0.001 to 0.005 percent boron, from 0 to 0.02 percent yttrium, from 1 to 4 percent molybdenum, from 1.25 to 10 percent chromium, from 0.5 to 2.0 percent niobium, from 0.05 to 0.5 percent zirconium, from 5.0 to 6.6 percent aluminum, from 0 to 2.0 percent titanium, from 3.0 to 7.5 percent tungsten, and from 0.1 to 6 percent of platinum, iridium, rhodium, and palladium, and combinations thereof, balance nickel and incidental impurities.

1 . A composition of matter consisting essentially of, in weight percent, from about 0.4 to about 6.5 percent ruthenium, from about 3 to about 8 percent rhenium, from about 5.8 to about 10.7 percent tantalum, from about 4.25 to about 17.0 percent cobalt, from 0.1 to about 2.0 percent hafnium, from about 0.02 to about 0.4 percent carbon, from about 0.001 to about 0.005 percent boron, from 0 to about 0.02 percent yttrium, from about 1 to about 4 percent molybdenum, from about 1.25 to about 10 percent chromium, from about 0.5 to about 2.0 percent niobium, from about 0.05 to about 0.5 percent zirconium, from about 5.0 to about 6.6 percent aluminum, from 0 to about 2.0 percent titanium, from about 3.0 to about 7.5 percent tungsten, and from about 0.1 to about 6 percent of an element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof, balance nickel and incidental impurities.  
   
   
       2 . The composition of matter of  claim 1 , wherein the composition has a nominal composition, in weight percent, of about 3 percent ruthenium, about 5.5 percent rhenium, about 8.25 percent tantalum, about 16.5 percent cobalt, from 0.5 to about 2.0 percent hafnium, about 0.03 percent carbon, about 0.004 percent boron, about 0.01 percent yttrium, about 2.0 percent molybdenum, about 2 percent chromium, from about 1 to about 2 percent niobium, from about 0.1 to about 0.5 percent zirconium, about 5.5 percent aluminum, from 0 to about 2.0 percent titanium, about 6 percent tungsten, and from about 0.5 to about 2.0 percent of the element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof.  
   
   
       3 . The composition of matter of  claim 1 , wherein the composition has from about 0.5 to about 2.0 percent of the element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof.  
   
   
       4 . An article comprising: 
 a substantially single crystal piece having a composition consisting essentially of, in weight percent, from about 0.4 to about 6.5 percent ruthenium, from about 3 to about 8 percent rhenium, from about 5.8 to about 10.7 percent tantalum, from about 4.25 to about 17.0 percent cobalt, from 0.1 to about 2.0 percent hafnium, from about 0.02 to about 0.4 percent carbon, from about 0.001 to about 0.005 percent boron, from 0 to about 0.02 percent yttrium, from about 1 to about 4 percent molybdenum, from about 1.25 to about 10 percent chromium, from about 0.5 to about 2.0 percent niobium, from about 0.05 to about 0.5 percent zirconium, from about 5.0 to about 6.6 percent aluminum, from 0 to about 2.0 percent titanium, from about 3.0 to about 7.5 percent tungsten, and from about 0.1 to about 6 percent of an element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof, balance nickel and incidental impurities.    
   
   
       5 . The article of  claim 4 , wherein the single crystal piece is substantially free of TCP phase.  
   
   
       6 . The article of  claim 4 , wherein the article has a nominal composition, in weight percent, of about 3 percent ruthenium, about 5.5 percent rhenium, about 8.25 percent tantalum, about 16.5 percent cobalt, from 0.5 to about 2.0 percent hafnium, about 0.03 percent carbon, about 0.004 percent boron, about 0.01 percent yttrium, about 2.0 percent molybdenum, about 2 percent chromium, from about 1 to about 2 percent niobium, from about 0.1 to about 0.5 percent zirconium, about 5.5 percent aluminum, from 0 to about 2.0 percent titanium, about 6 percent tungsten, and from about 0.5 to about 2.0 percent of the element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof.  
   
   
       7 . The article of  claim 4 , wherein the article has a nominal composition including from about 0.5 to about 2.0 percent of the element selected from the group consisting of platinum, iridium, rhodium, and palladium, and combinations thereof.  
   
   
       8 . The article of  claim 4 , wherein the article is a component of a gas turbine engine.  
   
   
       9 . The article of  claim 4 , wherein the article is a gas turbine blade or a gas turbine vane.  
   
   
       10 . The article of  claim 4 , further including 
 a protective coating overlying the substantially single-crystal piece.    
   
   
       11 . The article of  claim 4 , wherein the single crystal piece is substantially free of TCP phase.