B212 Development of a rotor alloy for advanced ultra super critical turbine power generation system

Abstract

Nickel base super alloy 'TOS1X' was developed for 700℃ class A-USC turbine rotor. TOS1X are an alloy which was improved the creep rupture strength of Inconel^<TM>617. A model rotor with a weight of 7 ton was manufactured using the TOS1X by double melt process(VIM and ESR) and forging. The model rotor have neither forging crack nor segregation. The yield and tensile strength of the model rotor were the increase of about 10% of Inconel^<TM>617. The 700℃-10^5 hours creep rupture strength of the model rotor was 160MPa or more.