Nickel-based superalloy having very high resistance to hot-corrosion for monocrystalline blades of industrial turbines

Abstract

Nickel-based superalloy, suitable for monocrystalline solidification, having the following composition by weight: Co: 4.75 to 5.25% Cr: 15.5 to 16.5% Mo: 0.8 to  1.2% W: 3.75 to 4.25% Al: 3.75 to 4.25% Ti: 1.75 to 2.25% Ta: 4.75 to 5.25% C: 0.006 to  0.04% B: ≦  0.01% Zr: ≦  0.01% Hf: ≦  1% Nb: ≦  1% Ni and any impurities: complement to 100%.

We claim:  
     
         1 . A nickel-based superalloy, suitable for monocrystalline solidification, characterised in that its composition by weight is as follows:  
       
         
           
                 
                 
                 
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   Co: 
                   4.75 
                     
                   to 
                   5.25% 
                 
                     
                   Cr: 
                   15.5 
                   to 
                   16.5% 
                 
                     
                   Mo: 
                   0.8 
                   to 
                    1.2% 
                 
                     
                   W: 
                   3.75 
                     
                   to 
                   4.25% 
                 
                     
                   Al: 
                   3.75 
                     
                   to 
                   4.25% 
                 
                     
                   Ti: 
                   1.75 
                     
                   to 
                   2.25% 
                 
                     
                   Ta: 
                   4.75 
                     
                   to 
                   5.25% 
                 
                     
                   C: 
                   0.006 
                   to 
                    0.04% 
                 
                     
                   B: 
                     
                   ≦ 
                    0.01% 
                 
                     
                   Zr: 
                     
                   ≦ 
                    0.01% 
                 
                     
                   Hf: 
                     
                   ≦ 
                    1% 
                 
                     
                   Nb: 
                     
                   ≦ 
                    1% 
                 
                 
                 
               
                     
                   Ni and any impurities: complement to 100%. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
               
            
             
                
                
                
               
            
           
         
       
     
     
         2 . Industrial turbine blade produced by monocrystalline solidification of a superalloy according to  claim 1.