Microstructure, plastic flow and fracture behavior of ferrite-austenite duplex low density medium Mn steel

Quentin Tonizzo 1 Anne-Françoise Gourgues-Lorenzon 1 Matthieu Mazière 1 Astrid Perlade 2 Ian Zuazo
1 MAT - Centre des Matériaux
2 ArcelorMittal
Abstract : This study addresses the microstructure, plastic flow and fracture behavior of a laboratory Al-containing low density Fe-0.3C-6.7Mn-5.9Al medium Mn steel, intercritically annealed at either 850 °C or 900 °C, after cold rolling. Both resulting materials present an unordinary bimodal duplex microstructure made of coarse δ-ferrite grains and fine-grained (FG) {α-ferrite + retained austenite} regions. Tensile tests at room temperature and at −50 °C and Charpy impact tests showed that for both materials, each microstructural region presents its own fracture mechanisms and a specific ductile-to-brittle transition. A transition from brittle cleavage to ductile fracture is observed for coarse δ-ferrite grains, while FG regions present a transition from interfacial fracture to ductile fracture. The overall impact behavior seems to be driven by that of δ-ferrite grains.
Keywords : Low density medium Mn Duplex microstructure Fracture mechanism Cleavage Ductile damage
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Article dans une revue
Materials Science and Engineering: A, Elsevier, 2017, 706, pp.217-226. 〈10.1016/j.msea.2017.09.002〉
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01599803
Contributeur : Odile Adam <>
Soumis le : lundi 2 octobre 2017 - 15:08:11
Dernière modification le : lundi 12 novembre 2018 - 10:58:28

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Quentin Tonizzo, Anne-Françoise Gourgues-Lorenzon, Matthieu Mazière, Astrid Perlade, Ian Zuazo. Microstructure, plastic flow and fracture behavior of ferrite-austenite duplex low density medium Mn steel. Materials Science and Engineering: A, Elsevier, 2017, 706, pp.217-226. 〈10.1016/j.msea.2017.09.002〉. 〈hal-01599803〉

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