| Titre : | Effect of deformation and annealing on the formation and reversion of ε-martensite in an Fe–Mn–C alloy (2011) |
| Auteurs : | Yaping Lü, Auteur ; Bevis Hutchinson, Auteur ; Dmitri A. Molodov, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 58 N° 8, Mai 2010) |
| Article en page(s) : | pp. 3079–3090 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | 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 |
