Ni Base Alloy and Gas Turbine Blade and Gas Turbine Utilizing the Same

Abstract

An Ni base alloy uses GTD-111 as a base to improve high-temperature strength while maintaining the weldability and corrosion resistance and a gas turbine blade utilizes the Ni base alloy. The Ni base alloy contains Al of 2.5 to 3.5%, Co of 1.5 to 5.5%, Cr of 11.8 to 13.8%, Mo of 0.4 to 1.4%, Ta of 3.0 to 5.0%, Ti of 5.1 to 6.1%, W of 3.3 to 4.3%, B of 0.01 to 0.02%, C of 0.08 to 0.12% in mass % and remainder containing Ni and inevitable impurities and does not substantially contain Nb.

1 . An Ni base alloy containing Al of 2.5 to 3.5%, Co of 1.5 to 5.5%, Cr of 11.8 to 13.8%, Mo of 0.4 to 1.4%, Ta of 3.0 to 5.0%, Ti of 5.1 to 6.1%, W of 3.3 to 4.3%, B of 0.01 to 0.02%, C of 0.08 to 0.12% in mass % and remainder containing Ni and inevitable impurities. 
     
     
         2 . An Ni base alloy according to  claim 1 , wherein the inevitable impurities contain Nb of 0 to 0.2% or less, Hf of 0 to 2.0% or less, Re of 0 to 0.5% or less, Zr of 0 to 0.05% or less, O of 0 to 0.005% or less, N of 0 to 0.005% or less, Si of 0 to 0.01% or less, Mn of 0 to 0.02% or less, P of 0 to 0.01% or less and S of 0 to 0.01% or less in mass %. 
     
     
         3 . An Ni base alloy according to  claim 1 , wherein Nb is not substantially contained. 
     
     
         4 . An Ni base alloy according to  claim 1 , wherein the Ni base alloy precipitates γ′-phase having Ni 3 Al which is intermetallic compound as representation in γ-phase which is matrix phase. 
     
     
         5 . An Ni base alloy according to  claim 1 , wherein the Ni base alloy of precipitation strengthening type contains Al of 2.7 to 3.3%, Co of 3.0 to 4.0%, Cr of 12.3 to 13.3%, Mo of 0.6 to 1.2%, Ta of 3.5 to 4.5%, Ti of 5.3 to 5.9%, W of 3.6 to 4.0%, B of 0.012 to 0.018% and C of 0.09 to 0.11% in mass %. 
     
     
         6 . A casting product utilizing the Ni base alloy according to  claim 1 . 
     
     
         7 . A gas turbine blade utilizing the casting product according to  claim 6 . 
     
     
         8 . A gas turbine utilizing the gas turbine blade according to  claim 7 .