TRIP-Assisted Multiphase Steels with Niobium Additions. Microstructures and Properties

Abstract:

It seems completely clear that the combination within the same microstructure of various steel phases (ferrite, bainite, martensite) and the existence of the TRIP effect (i.e. a mechanically induced martensitic transformation) improves in a large way the properties of strength and ductility of low-alloy steels. TRIP-aided multiphase steels have been studied for several years and arouse a growing industrial interest. This project deals with the influence of a large Nb addition on the microstructure and mechanical properties of TRIP-assisted multiphase steels. It is shown that Nb influences in a large way the different phase transformations as well as the recrystallisation of the ferrite matrix occurring during the heat-treatment of cold-rolled TRIP-aided steels. As a consequence, the mechanical properties also depend on the parameters of the thermomechanical process and on the content and stability of the retained austenite.

• Periodical: Materials Science Forum (Volumes 500-501)
• Pages: 445-452
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.500-501.445
• Online since: November 2005
• Authors: V. Andrade-Carozzo, Pascal J. Jacques
• Keywords: Ferrite, Mechanical Property, Microstructure, Niobium, Retained Austenite, TRIP Steel

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