Triple-phase nano-composite steels

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/00 (2006.01) C22C 38/02 (2006.01) C22C 38/08 (2006.01) C22C 38/18 (2006.01) C21D 1/18 (2006.01) C21D 1/19 (2006.01)

Patent

CA 2470388

Carbon steels of high performance are disclosed that contain a three-phase microstructure consisting of grains of ferrite (11) fused with grains that contain dislocated lath structures in which laths of martensite (13) alternate with thin films of austenite (14). The structure includes the ferrite grains (11) fused with martensite-austenite grains (12), and each of the martensite- austenite grains (12) is of the dislocated lath structure, with substantially parallel laths (13) consisting of grains of martensite-phase crystals, the laths separated by thin films (14) of retained austenite phase. The microstructure can be formed by a unique method of austenization followed by multi-phase cooling in a manner that avoids bainite and pearlite formation and precipitation at phase interfaces. The desired microstructure can be obtained by casting, heat treatment, on-line rolling, forging, and other common metallurgical processing procedures, and yields superior combinations of mechanical and corrosion properties.

Selon cette invention, des aciers au carbone hautement performants contiennent une microstructure à phase triple composée de grains de ferrite (11) fusionnés avec des grains contenant des structures de lattis déformés dans lesquelles des lattis de martensite (13) alternent avec des couches minces d'austénite (14). La structure comprend les grains de ferrite (11) fusionnés avec les grains (12) de martensite-austénite, chacun de ces grains (12) de martensite-austénite constituant la structure de lattis déformés, les lattis (13) sensiblement parallèles étant composés de grains de cristaux à phase martensite, les lattis étant séparés par des couches (14) minces de phase austénite retenue. La microstructure peut être formée par un procédé unique d'austénitisation suivi d'un refroidissement multi-phase effectué de manière à empêcher la formation de bainite et de perlite et la précipitation à des interfaces de phase. La microstructure souhaitée peut être obtenue par moulage, traitement thermique, laminage en circuit, forgeage et autres procédures de traitement métallurgique communes et permet de produire des combinaisons supérieures de propriétés mécaniques et anti-corrosives.

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