Polycrystalline nickel-based superalloy with excellent mechanical properties at high temperatures

摘要

PROBLEM TO BE SOLVED: To provide an Ni-based heat-resistant superalloy excellent in a tension characteristic and a creep characteristic, of course, at the room temperature and at the high temperature of 700°C by improving the constitution.SOLUTION: This nickel-based heat-resistant superalloy is composed, by weight, of 8.0-13.0% Co, 1.0% Fe, 18.0-25.0% Cr, 0.1-1.5% Mo, 0.1-3% W, 0.5-2.0% Al, 0.5-1.1% Ti, 0.5-2.5% Nb, 0.01-1.0% C, 0.5% Mn, 0.5% Si, 0.008% B, 0.05% Zr and the balance Ni with inevitable impurities. Further, this superalloy has mixed microstructure of base and ' precipitation.