Effect of deformation and annealing on the formation and reversion of ε-martensite in an Fe–Mn–C alloy / Yaping Lü in Acta materialia, Vol. 58 N° 8 (Mai 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3079–3090 Titre : Effect of deformation and annealing on the formation and reversion of ε-martensite in an Fe–Mn–C alloy Type de document : texte imprimé Auteurs : Yaping Lü, Auteur ; Bevis Hutchinson, Auteur ; Dmitri A. Molodov, Auteur Année de publication : 2011 Article en page(s) : pp. 3079–3090 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Fe–Mn alloys Mechanical twinning ε  -martensite Phase transformation Texture Résumé : Microstructure and texture evolution during cold rolling and subsequent annealing were studied in an Fe–22 wt.% Mn–0.376 wt.% C alloy. During rolling the deformation mechanisms were found to be dislocation slip, mechanical twinning, deformation-induced ε-martensite transformation and shear banding. At higher strains, the brass-type texture with a spread towards the Goss-type texture dominated. A decrease in the Cu- and S- components was attributed to the preferential transformation to ε-martensite in Cu- and S-oriented grains. The texture of ε-martensite was sharp and could be described as {1 1 2 9}〈3 3 6 2〉. The orientation relationship {1 1 1}γ//{0 0 0 1}ε and 〈110〉γ//〈1 1 –2 0〉ε between ε-martensite and austenite was observed but only certain variants were selected. On subsequent annealing, the ε-martensite transformed reversely to austenite by a diffusionless mechanism. Changes in length along rolling, normal and transverse directions on heating were anisotropic due to a combination of volume expansion and shape memory effects. The S-texture component increased significantly due to transformation from the ε-martensite. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000753 [article] Effect of deformation and annealing on the formation and reversion of ε-martensite in an Fe–Mn–C alloy [texte imprimé] / Yaping Lü, Auteur ; Bevis Hutchinson, Auteur ; Dmitri A. Molodov, Auteur . - 2011 . - pp. 3079–3090. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3079–3090 Mots-clés : Fe–Mn alloys Mechanical twinning ε  -martensite Phase transformation Texture Résumé : Microstructure and texture evolution during cold rolling and subsequent annealing were studied in an Fe–22 wt.% Mn–0.376 wt.% C alloy. During rolling the deformation mechanisms were found to be dislocation slip, mechanical twinning, deformation-induced ε-martensite transformation and shear banding. At higher strains, the brass-type texture with a spread towards the Goss-type texture dominated. A decrease in the Cu- and S- components was attributed to the preferential transformation to ε-martensite in Cu- and S-oriented grains. The texture of ε-martensite was sharp and could be described as {1 1 2 9}〈3 3 6 2〉. The orientation relationship {1 1 1}γ//{0 0 0 1}ε and 〈110〉γ//〈1 1 –2 0〉ε between ε-martensite and austenite was observed but only certain variants were selected. On subsequent annealing, the ε-martensite transformed reversely to austenite by a diffusionless mechanism. Changes in length along rolling, normal and transverse directions on heating were anisotropic due to a combination of volume expansion and shape memory effects. The S-texture component increased significantly due to transformation from the ε-martensite. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000753

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