Ni-based heat resistant alloy, gas turbine component and gas turbine
View Patent ↗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 heat resistant alloy consisting 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,
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 alloy according to claim 1 , wherein the parameter Ps is in a range of Ps≧−3.0.
3. A gas turbine disc comprising the alloy according to claim 1 .
4. A gas turbine spacer comprising the 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 .