Metal treatment – Compositions – Heat treating
Patent
1977-04-11
1978-11-21
Dean, R.
Metal treatment
Compositions
Heat treating
75171, 148 325, C22C 1905
Patent
active
041264959
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 elements: Cr, Ti, Co, Mo and Ta. The nickel and aluminum may also be partially replaced by one or more of the following elements: 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 may contain a 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.
Chrysler Corporation
Dean R.
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