Die cast nickel base superalloy articles

Abstract

A die cast article such is composed of nickel base superaloy IN 718 is disclosed. The microstructure is characterized by an absence of flowlines and includes a fine average grain size, e.g., ASTM 3 or smaller. Exemplary articles include gas turbine engine components, such as blades, vanes, cases and seals.

What is claimed is:  
     
         1 . A die cast article composed in weight percent of about 15-25 Cr, 2.5-3.5 Mo, about 5.0-5.75 (Cb +Ta), 0.5-1.25 Ti, 0.25-1.0 Al, up to about 21 Fe, balance generally nickel.  
     
     
         2 . The article of  claim 1 , wherein the article is characterized by a microstructure having an absence of flowlines and having strength, crack growth rates imd stress rupture resistance in accordance with AMS 5663.  
     
     
         3 . The article of  claim 1 , wherein the article comprises a gas turbine engine component.  
     
     
         4 . The article of  claim 3 , wherein the article is a compressor component.  
     
     
         5 . The article of  claim 3 , wherein the article is a turbine component.  
     
     
         6 . The article of  claim 1 , wherein the average grain size is smaller than about ASTM 3.  
     
     
         7 . The article of  claim 1 , wherein the article has ail ultimate tensile strength at room temperature of at least 180 ksi and a 0.2% yield strength of at least 145 ksi.  
     
     
         8 . The article of  claim 7 , wherein the article has al ultimate tensile strength at about 1200 F.of at least 150 ksi and a 0.2% yield strength of at least 125 ksi.  
     
     
         9 . The article of  claim 1 , wherein the article is characterized by a microstructure having an absence of flowlines and having strength, crack growth rates and stress rupture resistance in accordance with AMS 5663.  
     
     
         10 . The article of  claim 1 , wherein the article has ail ultimate tensile strength at room temperature of at least 120 ksi and a 0.2% yield strength of at least 105 ksi.  
     
     
         11 . A die cast gas turbine engine component composed in weight percent of about 15-25 Cr, 2.5-3.5 Mo, about 5.0-5.75 (Cb+Ta), 0.5-1.25 Ti, 0.25-1.0 Al, up to about 21 Fe, balance generally nickel  
     
     
         12 . The article of  claim 11  characterized by a microstructure with an absence of flowlines.  
     
     
         13 . The article of  claim 11 , wherein the article has room temperature and 1200 F. strength and stress rupture resistance in accordance with AMS 5663.  
     
     
         14 . The article of  claim 11 , wherein the article is a compressor component.  
     
     
         15 . The article of  claim 11 , wherein the article is a turbine component.  
     
     
         16 . The article of  claim 20 , wherein the average grain size is smaller than about ASTM 3.  
     
     
         17 . The article of  claim 11 , wherein the article has an ultimate tensile strength at room temperature of at least 180 ksi and a 0.2% yield strength of at least 145 ksi.  
     
     
         18 . The article of  claim 11 , wherein the article has an ultimate tensile strength at about 1200 F.of at least 150 ksi and a 0.2% yield strength of at least 125 ksi.  
     
     
         19 . The article of  claim 11 , wherein the article has room temperature and 1200 F.strength and stress rupture resistance in accordance with AMS 5383.  
     
     
         20 . The article of  claim 19 , wherein the article has an ultimate tensile strength at room temperature of at least 120 ksi and a 0.2% yield strength of at least 105 ksi.