Fe-Cr-Ni-Al ferritic alloys

Details Fe-Cr-Ni-Al ferritic alloys Fe-Cr-Ni-Al ferritic alloys

1990-10-29

1992-02-18

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 43, 420 62, 4205841, C22C 3840, C22C 3806

Patent

active

050892231

ABSTRACT:
Fe-Cr-Ni-Al ferritic alloy capable of forming hot oxidation/corrosion resistive aluminum oxide scale in the surface thereof by exposure to oxidation environments at elevated temperatures. Due to the ferritic structure, the aluminum oxide scale is formed uniformly and densely to improve scale adherence, or prevent scale flaking. The mechanical properties of the ferritic alloy is considerably improved by incorporation of controlled amounts of Cr, Ni, and Al relative to each other, which are added to precipitate minute Ni-Al intermetallic compounds in the alloy matrix while retaining the ferritic structure. Such minute Ni-Al intermetallic compounds are thought to be responsible for improved mechanical properties, including high temperature strength, tensile strength, hardness and the like. Whereby, the alloy combine excellent hot oxidation/corrosion resistance and improved mechanical properties.

REFERENCES:
patent: 3754898 (1973-08-01), McGurty

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