High-strength four-phase steel alloys

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/18 (2006.01) C21D 6/00 (2006.01) C22C 38/34 (2006.01) C22C 38/38 (2006.01)

Patent

CA 2591067

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.

Cette invention concerne un alliage d'acier au carbone doté de propriétés combinées de forte résistance, de ductilité et de résistance à la corrosion, lequel alliage d'acier au carbone présente une microstructure qui contient des zones de ferrite combinées à des zones de martensite-austénite et dans laquelle on observe des précipités de carbure dispersés dans les zones de ferrite et aucun précipité de carbure dans les autres interfaces entre des phases différentes. La microstructure contient ainsi quatre phases distinctes, à savoir: (1) des lattes de martensite séparées par (2) des couches minces d'austénite résiduelles, ainsi que (3) des zones de ferrite contenant (4) des précipités de carbure. Dans certains modes de réalisation, la microstructure contient également des zones de ferrite dépourvues de carbure.

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