Heat-resistant alloys hardened with Ni3Nb

1. Heat-resisting alloys KhN60MBVYu and KhN50MBBYu, hardened by precipitation of Ni3Nb, have high mechanical properties at room and operating temperatures. 2. The addition of 10% Fe promotes the formation of M7W6, grain refining of the solid solution, and accelerates the transformation of the metastable Ni3Nb phase with a fcc lattice into the equilibrium modification with an orthorhombic lattice. 3. The M7W6 phase in the grain boundaries of the KhN50MBVYu alloy provides high plasticity at maximum hardening temperatures.