Heat-resistant alloys hardened with Ni3Nb

Heat-resisting alloys KhN60MBVYu and KhN50MBBYu, hardened by precipitation of Ni₃Nb, have high mechanical properties at room and operating temperatures.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.The M₇W₆ phase in the grain boundaries of the KhN50MBVYu alloy provides high plasticity at maximum hardening temperatures. Heat-resisting alloys KhN60MBVYu and KhN50MBBYu, hardened by precipitation of Ni₃Nb, have high mechanical properties at room and operating temperatures. 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. The M₇W₆ phase in the grain boundaries of the KhN50MBVYu alloy provides high plasticity at maximum hardening temperatures.