Cold-worked steels with packet-lath martensite/austenite...

C - Chemistry – Metallurgy – 21 – D

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Details

C21D 7/04 (2006.01) C21D 1/18 (2006.01) C21D 7/10 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01) C21D 8/06 (2006.01) C21D 1/19 (2006.01)

Patent

CA 2502114

Strain-hardened steel alloys having a high tensile strength are prepared by cold working of alloys whose microstructure includes grains in which laths of martensite alternate with thin films of stabilized austenite. Due to the high dislocation density of this microstructure and the tendency of the strains to move between the martensite and austenite phases, the strains created by cold working provide the microstructure with unique mechanical properties including a high tensile strength. Surprisingly, this is achieved without the need for intermediate heat treatments (patenting, in the case of steel wire) of the steel between cold working reductions.

La présente invention concerne des alliages d'acier écrouis ayant une résistance à la traction élevée, qui sont produits par écrouissage d'alliages dont la microstructure comprend des grains dans lesquels des lattages de martensite s'alternent avec de fins films d'austénite stabilisé. En raison d'une densité de dislocation élevée de cette microstructure et de la tendance des contraintes à se déplacer entre les phases martensitiques et austénitiques, les contraintes produites par l'écrouissage confèrent à la microstructure des propriétés mécaniques uniques comprenant une résistance à la traction élevée. De manière surprenante, ce résultat peut être obtenu sans impliquer de traitements thermiques intermédiaires (patentage dans le cas de fils d'acier) de l'acier entre les étapes de réduction de l'écrouissage.

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