Nickel-base superalloy

Details Nickel-base superalloy Nickel-base superalloy

1973-08-09

1978-04-04

Dean, R.

Metal treatment

Compositions

Heat treating

75171, 148 325, C22C 1905

Patent

active

040825817

ABSTRACT:
New nickel-base superalloys with good overall properties, the alloys being particularly adapted for high temperature applications at about 1800.degree. F. to 2000.degree. F., such as for turbine engine or other high temperature, high stress applications, and possessing a complex, multi-component gamma prime Ni.sub.3 Al.sub.1 matrix (not necessarily in the exact 3:1 proportion) in which both the nickel and aluminum atoms are partially replaced by, and/or containing, one or more of the following alloying elements: Cr, Ti, Co, Mo, Ta, W, C, Cb, Be, B, Zr and rare earths, such as for example, mischmetal. The gamma prime Ni.sub.3 Al.sub.1 matrix phase precipitates a delta Ni.sub.1 Al.sub.1 phase (not necessarily in the exact 1:1 proportion) at elevated temperatures (termed herein "inverse precipitation") thus providing critical high temperature strengthening of the matrix. Additionally, the alloy structure contains a fairly large quantity of carbides, some borides and some nitrides.

REFERENCES:
patent: 3310399 (1967-03-01), Baldwin
patent: 3617685 (1971-11-01), Brill-Edwards
patent: 3744996 (1973-07-01), Shaw et al.

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