Alloys or metallic compositions – Ferrous – Over 10 percent nickel containing
Patent
1993-08-06
1995-02-28
Yee, Deborah
Alloys or metallic compositions
Ferrous
Over 10 percent nickel containing
420107, 148335, C22C 3852
Patent
active
053934881
ABSTRACT:
A duplex strengthened structural steel that is particularly suitable for demanding applications which require both high yield strength and fatigue properties is provided. The preferred steel alloys of this invention are characterized by both the presence of intermetallic strengthening precipitates like maraging steels, as well as alloy carbide strengtheners as is common with secondary hardening steels. Titanium is substantially absent from the preferred steel alloys of this invention. Thus the formation of nonmetallic inclusions, such as titanium carbonitrides, are alleviated which correspondingly enhances the fatigue properties of the preferred alloys. To compensate for the lack of titanium strengthening precipitates within the alloy, additions of aluminum are provided such that the aluminum forms intermetallic strengthening precipitates with nickel.
REFERENCES:
patent: 4832909 (1989-05-01), Schmidt et al.
patent: 5087415 (1992-02-01), Hemphill et al.
Garrison et al.; A Preliminary Study of the Influence of Separate and Combined Aluminum and Nickel Additions on the Properties of a Secondary Hardening Steel; Metallurgical Transactions; vol. 19A (1988) pp. 3103-3107.
Garrison, Jr. Warren M.
Raymond Edward L.
Rhoads Mark A.
General Electric Company
Narciso David L.
Squillaro Jerome C.
Yee Deborah
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