Conclusions
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1.
Heat-resisting alloys KhN60MBVYu and KhN50MBBYu, hardened by precipitation of Ni3Nb, have high mechanical properties at room and operating temperatures.
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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.
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3.
The M7W6 phase in the grain boundaries of the KhN50MBVYu alloy provides high plasticity at maximum hardening temperatures.
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Literature cited
G. A. Sveshnikova and A. M. Borzdyka, Izv. Akad. Nauk SSSR, Metally, No. 6 (1966).
G. A. Sveshnikova, Metal. i Term. Obrabotka Metal., No. 1 (1966).
L. N. Zimina and M. V. Pridantsev, Coll: Special Steels and Alloys, No. 17 [in Russian], TsNIIChM (1960).
R. K. Jifkins, Coll: Atomic Mechanism of Failure [Russian translation], metallurgizdat, Moscow (1963).
D. McLean, Grain Boundaries in Metals, Oxford University Press, London (1957).
E. E. Levin and B. M. Gurelev, Metal. i Term. Obrabotka Metal., No. 1 (1967).
Additional information
TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 20–24, March, 1969
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Zimina, L.N., Sveshnikova, G.A. & Sukhova, E.E. Heat-resistant alloys hardened with Ni3Nb. Met Sci Heat Treat 11, 185–189 (1969). https://doi.org/10.1007/BF00658727
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DOI: https://doi.org/10.1007/BF00658727