Nickel-based alloy and turbine wheel incorportating same

Abstract

Turbocharger turbine wheels including nickel-based alloys are disclosed herein. In one exemplary embodiment, a turbocharger turbine wheel includes as, at least part of its constituency, a nickel-based alloy that includes, on a weight basis of the overall alloy: a nickel-based alloy includes or consists of, on a weight basis of the overall alloy: about 2.00% to about 3.00% cobalt, about 12.0% to about 14.0% chromium, about 5.75% to about 6.85% aluminum, about 5.00% to about 6.00% tungsten, about 2.25% to about 2.75% molybdenum, about 1.25% to about 2.00% titanium, about 0.55% to about 1.50% niobium, about 0.13% to about 0.17% carbon, about 0.03 to about 0.05% zirconium, about 0.01% to about 0.02 boron, and a majority of nickel, with the understanding that there may be inevitable/unavoidable impurities. The turbocharger turbine wheel may be configured for operating at about 980° C. to about 1020° C.

1 . A nickel-based alloy, wherein the nickel-based alloy comprises, on a weight basis of the overall alloy:
 about 2.00% to about 3.00% cobalt,   about 12.0% to about 14.0% chromium,   about 5.75% to about 6.85% aluminum,   about 5.00% to about 6.00% tungsten,   about 2.25% to about 2.75% molybdenum,   about 1.25% to about 2.00% titanium,   about 0.55% to about 1.50% niobium,   about 0.13% to about 0.17% carbon,   about 0.03 to about 0.05% zirconium,   about 0.01% to about 0.02% boron, and   a majority of nickel, with the proviso that inevitable/unavoidable impurities may be present in trace amounts.   
     
     
         2 . The nickel-based alloy of  claim 1 , wherein the amount of cobalt is from about 2.25% to about 2.75%. 
     
     
         3 . The nickel-based alloy of  claim 1 , wherein the amount of chromium is from about 12.00% to about 12.80%. 
     
     
         4 . The nickel-based alloy of  claim 1 , wherein the amount of aluminum is from about 6.40% to about 6.80%. 
     
     
         5 . The nickel-based alloy of  claim 1 , wherein the amount of tungsten is from about 5.25% to about 5.75%. 
     
     
         6 . The nickel-based alloy of  claim 1 , wherein the amount of molybdenum is from about 2.40% to about 2.60%. 
     
     
         7 . The nickel-based alloy of  claim 1 , wherein the amount of titanium is from about 1.35% to about 1.65%. 
     
     
         8 . The nickel-based alloy of  claim 1 , wherein the amount of niobium is from about 0.80% to about 1.20%. 
     
     
         9 . A turbocharger turbine wheel comprising, at least as a part of its overall composition, a nickel-based alloy, wherein the nickel-based alloy comprises, on a weight basis of the overall alloy:
 about 2.00% to about 3.00% cobalt,   about 12.0% to about 14.0% chromium,   about 5.75% to about 6.85% aluminum,   about 5.00% to about 6.00% tungsten,   about 2.25% to about 2.75% molybdenum,   about 1.25% to about 2.00% titanium,   about 0.55% to about 1.50% niobium,   about 0.13% to about 0.17% carbon,   about 0.03 to about 0.05% zirconium,   about 0.01% to about 0.02 boron, and   a majority of nickel, with the proviso that inevitable/unavoidable impurities may be present in trace amounts.   
     
     
         10 . The turbocharger turbine wheel of  claim 9 , wherein the amount of cobalt is from about 2.25% to about 2.75%. 
     
     
         11 . The turbocharger turbine wheel of  claim 9 , wherein the amount of chromium is from about 12.00% to about 12.80%. 
     
     
         12 . The turbocharger turbine wheel of  claim 9 , wherein the amount of aluminum is from about 6.40% to about 6.80%. 
     
     
         13 . The turbocharger turbine wheel of  claim 9 , wherein the amount of tungsten is from about 5.25% to about 5.75%. 
     
     
         14 . The turbocharger turbine wheel of  claim 9 , wherein the amount of molybdenum is from about 2.40% to about 2.60%. 
     
     
         15 . The turbocharger turbine wheel of  claim 9 , wherein the amount of titanium is from about 1.35% to about 1.65%. 
     
     
         16 . The turbocharger turbine wheel of  claim 9 , wherein the amount of niobium is from about 0.80% to about 1.20%. 
     
     
         17 . The turbocharger turbine wheel of  claim 9 , wherein the turbocharger turbine wheel is configured for operation at a temperature range of about 980° C. to about 1020° C. 
     
     
         18 . The turbocharger turbine wheel of  claim 11 , wherein the amount of chromium is from 12.4% to about 12.80.