ARLAZAROV, Artem; GOUNÉ, Mohamed; BOUAZIZ, Olivier; HAZOTTE, Alain; PETITGAND, Gérard; BARGES, Patrick

doi:10.1016/j.msea.2012.02.024

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ARLAZAROV, Artem
ArcelorMittal Maizières Research SA
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

GOUNÉ, Mohamed
ArcelorMittal Maizières Research SA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BOUAZIZ, Olivier
ArcelorMittal Maizières Research SA
Centre des Matériaux [CDM]

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Materials Science and Engineering: A. 2012, vol. 542, p. 31-39

Elsevier

Résumé en anglais

A double annealing process was applied to cold rolled medium Mn steel. The evolution of both microstructure and mechanical properties during the second annealing were analysed. Austenite reverted transformation (ART) was observed during intercritical annealing. It was shown that a complex ultra-fine microstructure composed of three phases (retained austenite/martensite/ferrite) was formed and two types of morphologies were detected (lath-like and polygonal). Furthermore, a high volume fraction of retained austenite (22%), which was stabilized at room temperature, was the origin of a TRIP effect. A good balance between strength and ductility can be achieved by optimizing the heat treatment. The various results are discussed and some mechanisms are proposed to explain the observations.< Réduire

Mots clés en anglais

Medium Mn steel

Retained austenite

Martensite recrystallization

Phase transformation

Transformation induced plasticity (TRIP)

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Evolution of microstructure and mechanical properties of medium Mn steels during double annealing

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