Superalloy having a nickel base matrix, manufactured by powder-metallurgical processing, and gas turbine discs made from this alloy

摘要

1. A superalloy comprising a nickel-based matrix and having good mechanical properties when hot, as regards tensile strength, creep strength, oligocyclic fatigue and resistance to cracking, characterised in that the percentage chemical composition by weight is within the following range : Cr 11 to 13 Co 8 to 17 Mo 6 to 8 Nb not more than 1.5 Ti 4 to 5 Al 4 to 5 Hf not more than 1 C, B, Zr none more than 500 ppm Ni remainder of 100.