Ni-Based Heat Resistant Alloy, Gas Turbine Component and Gas Turbine

Abstract

A Ni-based heat resistant alloy has a composition of, by mass percent, carbon: 0.001 to 0.1%, chromium: 16 to 22%, aluminum: 0.5 to 1.5%, molybdenum: 0.1 to 2.0%, tungsten: 0.1 to 6.0%, niobium: 3.5 to 5.5%, titanium: 0.8 to 3.0%, iron: 16 to 20%, and the balance being nickel and inevitable impurities. A parameter Ps indicating a segregation tendency is in a range of Ps≧−3.5. The parameter Ps is represented by Formula (1). Ps=1.05×Al content+0.6×Ti content−0.8×Nb content−0.3×Mo content   (1)

1 . A nickel-based forging alloy comprising, by mass percent,
 carbon: 0.001 to 0.1%,   chromium: 16 to 22%,   aluminum: 0.5 to 1.5%,   molybdenum: 0.1 to 2.0%,   tungsten: 0.1 to 6.0%,   niobium: 3.5 to 5.5%,   titanium: 0.8 to 3.0%,   iron: 16 to 20%, and   nickel as the main component,   
       wherein a parameter Ps indicating a segregation tendency is in a range of Ps≧−3.5, wherein the parameter Ps is represented by following formula:
     Ps= 1.05×Al content+0.6×Ti content−0.8×Nb content−0.3×Mo content.
 
 
     
     
         2 . The nickel-based forging alloy according to  claim 1 , wherein the parameter Ps is in a range of Ps≧−3.0. 
     
     
         3 . A gas turbine disc comprising the nickel-based forging alloy according to  claim 1 . 
     
     
         4 . A gas turbine spacer comprising the nickel-based forging alloy according to  claim 1 . 
     
     
         5 . A gas turbine comprising the gas turbine disc according to  claim 3 . 
     
     
         6 . A gas turbine comprising the gas turbine spacer according to  claim 4 .