High oxidation-resistant alloy and gas turbine applications using the same

Abstract

An alloy is disclosed, encompassing reduced amounts of Hafnium and Carbon so as to achieve an excellent oxidation resistance, as well as gas turbine applications using the same.

1 . A high oxidation-resistant alloy having a nominal composition comprising:
 Co 9.00-9.50 wt %;   W 9.30-9.70 wt %;   Cr 8.00-8.70 wt %;   Al 4.00-15.50 wt %;   Ti 0.60-0.90 wt %;   Ta 2.80-3.30 wt %;   Mo 0.40-0.60 wt %;   Hf up to 1.20 wt %;   Ni;   based on the alloy weight.   
     
     
         2 . The high oxidation-resistant alloy of  claim 1 , wherein Al is present in an amount of 7-10.50 wt %. 
     
     
         3 . The high oxidation-resistant alloy of  claim 1 , wherein Hf is present in an amount of 1.00-1.20 wt %. 
     
     
         4 . The high oxidation-resistant alloy of  claim 1 , further comprising Re in a non-zero amount of up to 4.0 wt %. 
     
     
         5 . The high oxidation-resistant alloy of  claim 1 , further comprising C in a non-zero amount up to 0.065 wt %. 
     
     
         6 . The high oxidation-resistant alloy of  claim 1 , further comprising Mg in a non-zero amount of up to 0.008 wt %, and Mo, B, Zr, Fe, O, N, S, or a mixture thereof, in an amount of up to 0.879 wt %. 
     
     
         7 . The high oxidation-resistant alloy of  claim 1 , further comprising Mg, B, Zr, Fe, O, N, S, or a mixture thereof, in an amount of up to 0.287 wt %. 
     
     
         8 . The high oxidation-resistant alloy of  claim 1 , further comprising B in a non-zero amount of up to 0.015 wt %, and Mg, Mo, Zr, Fe, O, N, S, or a mixture thereof, in an amount of up to 0.872 wt %. 
     
     
         9 . The high oxidation-resistant alloy of  claim 1 , further comprising Zr in a non-zero amount of up to 0.015 wt %, and Mg, Mo, B, Fe, O, N, S, or a mixture thereof, in an amount of up to 0.872 wt %. 
     
     
         10 . The high oxidation-resistant alloy of  claim 1 , further comprising Fe in a non-zero amount of up to 0.20 wt %, and Mg, Mo, B, Zr, O, N, S, or a mixture thereof, in an amount of up to 0.687 wt %. 
     
     
         11 . The high oxidation-resistant alloy of  claim 1 , further comprising O in a non-zero amount of up to 0.02 wt %, and Mg, Mo, B, Zr, Fe, N, S, or a mixture thereof, in an amount of up to 0.867 wt %. 
     
     
         12 . The high oxidation-resistant alloy of  claim 1 , further comprising N in a non-zero amount of up to 0.005 wt %, and Mg, Mo, B, Zr, Fe, O, S, or a mixture thereof, in an amount of up to 0.882 wt %. 
     
     
         13 . The high oxidation-resistant alloy of  claim 1 , further comprising S in a non-zero amount of up to 0.004 wt %, and Mg, Mo, B, Zr, Fe, O, N, or a mixture thereof in an amount of up to 0.883 wt %. 
     
     
         14 . The high oxidation-resistant alloy of  claim 1 , having a nominal composition consisting of:
 Co 9.00-9.50 wt %;   W 9.30-9.70 wt %;   Cr 8.00-8.70 wt %;   Al 4.00-10.50 wt %;   Ti 0.60-0.90 wt %;   Ta 2.80-3.30 wt %;   Hf up to 1.20 wt %;   Mn up to 0.05 wt %;   Mg up to 0.008 wt %;   Mo up to 0.60 wt %;   Si up to 0.02 wt %;   B up to 0.015 wt %;   Zr up to 0.015 wt %;   Fe up to 0.20 wt %;   O up to 0.020 wt %;   N up to 0.0050 wt %;   S up to 0.0040 wt %;   C up to 0.065 wt %;   Re up to 0.4 wt %;   Ni balance;   based on the alloy weight.   
     
     
         15 . The high oxidation-resistant alloy of  claim 14 , having a nominal composition consisting of:
 Co 9.07 wt %;   W 9.36 wt %;   Cr 8.43 wt %;   Al 5.73 wt %;   Ti 0.65 wt %;   Ta 2.93 wt %;   Mo 0.51 wt %;   Hf 1.02 wt %;   Mn up to 0.001 wt %;   Mg up to 0.060 wt %;   Si 0.06 wt %;   B 0.010 wt %;   Zr 0.012 wt %;   Fe 0.035 wt %;   O 0.014 wt %;   N 0.002 wt %;   S up to 0.010 wt %;   C 0.043 wt %;   Re 0.00 wt %;   Ni balance;   based on the alloy weight.   
     
     
         16 . The high oxidation-resistant alloy of  claim 1 , obtainable by Powder Metallurgy, Investment Casting, Direct Metal Laser Melting (DMLM), Selective Laser Melting (SLM), Selective Laser Sintering (SLS), Laser Metal Forming (LMF) or Electron Beam Melting (EBM). 
     
     
         17 . A method for producing a turbomachine component, comprising producing the component by additive manufacturing technologies employing a high oxidation-resistant alloy according to  claim 1 . 
     
     
         18 . A gas turbine component, the component being a bucket, nozzle, combustion chamber or shroud, made of the alloy of  claim 1 .