Nickel-containing alloys, method of manufacture thereof and articles derived thereform

Abstract

Disclosed herein too is a method for manufacturing an article comprising casting an alloy comprising about 1.5 to about 4.5 weight percent aluminum; about 1.5 to about 4.5 weight percent titanium; up to about 3 weight percent niobium; about 14 to about 28 weight percent chromium; about 10 to 23 weight percent cobalt; about 1 to about 3 weight percent of tungsten, rhenium, ruthenium, molybdenum, or a combination thereof; about 0.02 to about 0.15 weight percent of carbon; about 0.001 to about 0.025 weight percent of boron; up to 0.2 weight percent of zirconium, hafnium, or a combination thereof; into a mold.

1 . A nickel-containing alloy comprising: 
 about 1.5 to about 4.5 weight percent aluminum;    about 1.5 to about 4.5 weight percent titanium;    up to about 3 weight percent niobium;    about 14 to about 28 weight percent chromium;    with the remainder being nickel.    
     
     
         2 . The nickel-containing alloy of  claim 1 , wherein the sum of the amount of aluminum and titanium is about 2 to about 9 weight percent, of the nickel-containing alloy.  
     
     
         3 . The nickel-containing alloy of  claim 1 , wherein the atomic ratio of aluminum to titanium is about 0.5 to about 1.5.  
     
     
         4 . The nickel-containing alloy of  claim 1 , wherein the sum of the titanium, aluminum and niobium is about 2 to about 12 weight percent, of the nickel-containing alloy.  
     
     
         5 . The nickel-containing alloy of  claim 1 , wherein the nickel is present in an amount of about 40 to about 70 weight percent, of the nickel-containing alloy.  
     
     
         6 . The nickel-containing alloy of  claim 1 , further comprising cobalt, carbon, zirconia, tungsten, boron, tantalum, hafnium, rhenium, ruthenium, molybdenum, or a combination comprising at least one of the foregoing.  
     
     
         7 . The nickel-containing alloy of  claim 6 , wherein the cobalt is present in an amount of about 10 to about 23 weight percent, of the nickel-containing alloy.  
     
     
         8 . The nickel-containing alloy of  claim 6 , wherein the carbon is present in an amount of about 0.02 to about 0.15 weight percent, of the nickel-containing alloy.  
     
     
         9 . The nickel-containing alloy of  claim 6 , wherein the tungsten is present in an amount of about 1 to about 3 weight percent, of the nickel-containing alloy.  
     
     
         10 . The nickel-containing alloy of  claim 6 , wherein the boron is present in an amount of about 0.001 to about 0.025 weight percent, of the nickel-containing alloy.  
     
     
         11 . A nickel-containing alloy comprising: 
 about 1.6 to about 1.8 weight percent aluminum;    about 2.2 to about 2.4 weight percent titanium;    about 1.25 to 1.45 weight percent niobium;    about 22 to about 23 weight percent chromium;    about 18.5 to about 19.5 weight percent cobalt;    about 0.08 to about 0.12 weight percent carbon;    about 1.9 to about 2.1 weight percent tungsten;    and about 0.002 to about 0.006 weight percent boron;    up to 0.01 weight percent zirconium; with the remainder being nickel.    
     
     
         12 . The nickel-containing alloy of  claim 11 , wherein the zirconium may be substituted with hafnium.  
     
     
         13 . A method for manufacturing an article comprising: 
 casting an alloy comprising about 1.5 to about 4.5 weight percent aluminum; about 1.5 to about 4.5 weight percent titanium; up to about 3 weight percent niobium; about 14 to about 28 weight percent chromium; about 10 to 23 weight percent cobalt; about 1 to about 3 weight percent of tungsten, rhenium, ruthenium, molybdenum, or a combination thereof; about 0.02 to about 0.15 weight percent of carbon; about 0.001 to about 0.025 weight percent of boron; up to 0.2 weight percent of zirconium, hafnium, or a combination thereof; into a mold; and    solidifying the casting.    
     
     
         14 . The method of  claim 13 , further comprising directionally solidifying the casting.  
     
     
         15 . The method of  claim 13 , wherein the casting is an equiaxed casting.  
     
     
         16 . The method of  claim 13 , further comprising heat treating the casting at a temperature of about 1095 to about 1200° C.  
     
     
         17 . The method of  claim 16 , wherein the heat treatment is conducted for a period of about 1 to about 4 hours.  
     
     
         18 . The method of  claim 13 , further comprising solution heat treating the casting at a temperature of about 750 to about 850° C.  
     
     
         19 . A turbine component manufactured from the composition of  claim 1 .  
     
     
         20 . A turbine component manufactured from the composition of  claim 11 .  
     
     
         21 . A turbine component manufactured by the method of  claim 13.