High-strength four-phase steel alloys

Details High-strength four-phase steel alloys High-strength four-phase steel alloys

2007-05-08

2007-05-08

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S325000, C148S660000, C148S664000

Reexamination Certificate

active

11027334

ABSTRACT:
A carbon steel alloy that exhibits the combined properties of high strength, ductility, and corrosion resistance is one whose microstructure contains ferrite regions combined with martensite-austenite regions, with carbide precipitates dispersed in the ferrite regions but without carbide precipitates are any of the interfaces between different phases. The microstructure thus contains of four distinct phases: (1) martensite laths separated by (2) thin films of retained austenite, plus (3) ferrite regions containing (4) carbide precipitates. In certain embodiments, the microstructure further contains carbide-free ferrite regions.

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