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Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel / Seawoong Lee in Acta materialia, Vol. 59 N° 20 (Décembre 2011) 

Public ISBD [article]  in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7546–7553 Titre : Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel Type de document : texte imprimé Auteurs : Seawoong Lee, Auteur ; Seok-Jae Lee, Auteur ; Bruno C. De Cooman, Auteur Année de publication : 2012 Article en page(s) : pp. 7546–7553 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ultra-fine  grain  size  Localized  deformation  Grain  boundary  thickening Résumé : Ultrafine grain refinement by intercritical annealing at 680 °C and 640 °C was investigated in a Fe–0.05%C–6.15%Mn–1.4%Si multiphase TRIP steel. A large volume fraction of retained austenite was obtained at room temperature in both cases. Whereas a pronounced localization of the deformation during tensile testing appeared in the steel annealed at 640 °C, strain localization occurred only in the initial deformation stages in the steel annealed at 680 °C. The retained austenite was transformed to strain-induced martensite during tensile testing in the sample annealed at 680 °C. However, no martensitic transformation was observed in the sample annealed at 640 °C. The activation volume showed a sharp decrease during the tensile test and saturated to the same value in both cases. Two different dislocation structures were observed in the ferrite grains of the samples annealed intercritically at 680 °C after tensile deformation, but only the dislocation-free structure of ferrite was observed in the sample annealed at 640 °C. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006057 [article] Work hardening behavior of ultrafine-grained Mn transformation-induced plasticity steel [texte imprimé] / Seawoong Lee, Auteur ; Seok-Jae Lee, Auteur ; Bruno C. De Cooman, Auteur . - 2012 . - pp. 7546–7553. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7546–7553 Mots-clés : Ultra-fine  grain  size  Localized  deformation  Grain  boundary  thickening Résumé : Ultrafine grain refinement by intercritical annealing at 680 °C and 640 °C was investigated in a Fe–0.05%C–6.15%Mn–1.4%Si multiphase TRIP steel. A large volume fraction of retained austenite was obtained at room temperature in both cases. Whereas a pronounced localization of the deformation during tensile testing appeared in the steel annealed at 640 °C, strain localization occurred only in the initial deformation stages in the steel annealed at 680 °C. The retained austenite was transformed to strain-induced martensite during tensile testing in the sample annealed at 680 °C. However, no martensitic transformation was observed in the sample annealed at 640 °C. The activation volume showed a sharp decrease during the tensile test and saturated to the same value in both cases. Two different dislocation structures were observed in the ferrite grains of the samples annealed intercritically at 680 °C after tensile deformation, but only the dislocation-free structure of ferrite was observed in the sample annealed at 640 °C. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006057