Ni-Based Single Crystal Superalloy with Good Creep Property

Abstract

A Ni-based single crystal superalloy with good resistance to creep deformation and creep life at a high temperature is formed by adjusting the quantity of relatively inexpensive alloy elements while minimizing the quantity of expensive alloy elements. The Ni-based single crystal superalloy with good creep properties comprises Co: 11.5˜13.5%, Cr: 3.0˜5.0%, Mo: 0.7˜2.0%, W: 8.5˜10.5%, Al: 4.5˜6.5%, Ti: 0.5˜2.0%, Ta: 6.0˜8.0%, Re: 2.0˜4.0%, Ru: 0.1˜2.0% in Weight %, with the rest of the superalloy comprising Ni and other inevitable impurities. In addition, the superalloy has a mixed structure of the γ matrix and γ′ particles.

1 . A Ni-based single crystal superalloy comprising: Co: 11.5˜13.5%, Cr: 3.0˜5.0%, Mo: 0.7˜2.0%, W: 8.5˜10.5%, Al: 4.56.5%, Ti: 1.02˜2.0%, Ta: 6.0˜8.0%, Re: 2.0˜4.0%, Ru: 0.1˜2.0% in weight %, and Ni. 
     
     
         2 . The Ni-based single crystal superalloy of  claim 1 , wherein the superalloy has a mixed structure of γ matrix and γ′ particles. 
     
     
         3 - 11 . (canceled) 
     
     
         12 . A Ni-based single crystal superalloy consisting essentially of: Co: 11.5˜13.5%, Cr: 3.0˜5.0%, Mo: 0.7˜2.0%, W: 8.5˜10.5%, Al: 4.5˜6.5%, Ti: 1.02˜2.0%, Ta: 6.0˜8.0%, Re: 2.0˜4.0%, Ru: 0.1˜2.0% in weight %, and Ni. 
     
     
         13 . A Ni-based single crystal superalloy consisting of: Co: 11.5˜13.5%, Cr: 3.0˜5.0%, Mo: 0.72.0%, W: 8.5˜10.5%, Al: 4.5˜6.5%, Ti: 1.02˜2.0%, Ta: 6.0˜8.0%, Re: 2.0˜4.0%, Ru: 0.1˜2.0% in weight %, and Ni.