Multi-phase metallic systems of the .gamma.,.gamma.', NBC type w

Details Multi-phase metallic systems of the .gamma.,.gamma.', NBC type w Multi-phase metallic systems of the .gamma.,.gamma.', NBC type w

1979-11-13

1982-03-09

Dean, R.

Metal treatment

Compositions

Heat treating

75171, C22C 1905

Patent

active

043187560

ABSTRACT:
A refractory composite material has a nickel-based matrix, containing chromium, hardened by elements such as W in solid solution and hardened by precipitation of a .gamma.'(Ni,Xi).sub.3 (Al,Yi) phase, Xi representing elements different from Ni and Yi elements different from Al which the matrix may contain and which are respectively substituted for Ni and Al atoms in the formation of the .gamma.' precipitate, and with aligned monocrystalline fibers of a transition metal monocarbide, preferably niobium monocarbide, imbedded in said matrix, as obtained by unidirectional solidification. The chromium proportion of the material is maintained at a value lower than that from which the chromium carbide of formula Cr.sub.23 C.sub.6 is formed in the matrix at the expense of the niobium carbide of the reinforcement fibers at the operating temperatures foreseen for the material.

REFERENCES:
patent: 3799769 (1974-03-01), Tarshis et al.
patent: 3904402 (1975-09-01), Smashey
patent: 4043841 (1977-08-01), Bibring et al.
Bibring et al., Memories Scientifiques Rev. Metallurg., pp. 341-358, LXIX, o. 5, 1972.
Raman, Z. Metallkde., pp. 163-172, bd. 68 (1977) H.3.
Buchanan et al., Metallurgical Transactions, vol. 4, Aug. 1973, pp. 1895-1904.

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