On the mechanism of twin formation in Fe–Mn–C TWIP steels / H. Idrissi in Acta materialia, Vol. 58 N° 7 (Avril 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2464–2476 Titre : On the mechanism of twin formation in Fe–Mn–C TWIP steels Type de document : texte imprimé Auteurs : H. Idrissi, Auteur ; K. Renard, Auteur ; L. Ryelandt, Auteur Année de publication : 2011 Article en page(s) : pp. 2464–2476 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : TWIP steels Dislocations Twinning mechanisms Transmission electron microscopy Résumé : Although it is well known that Fe–Mn–C TWIP steels exhibit high work-hardening rates, the elementary twinning mechanisms controlling the plastic deformation of these steels have still not been characterized. The aim of the present study is to analyse the extended defects related to the twinning occurrence using transmission electron microscopy. Based on these observations, the very early stage of twin nucleation can be attributed to the pole mechanism with deviation proposed by Cohen and Weertman or to the model of Miura, Takamura and Narita, while the twin growth is controlled by the pole mechanism proposed by Venables. High densities of sessile Frank dislocations are observed within the twins at the early stage of deformation, which can affect the growth and the stability of the twins, but also the strength of these twins and their interactions with the gliding dislocations present in the matrix. This experimental evidence is discussed and compared to recent results in order to relate the defects analysis to the macroscopic behaviour of this category of material. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008787 [article] On the mechanism of twin formation in Fe–Mn–C TWIP steels [texte imprimé] / H. Idrissi, Auteur ; K. Renard, Auteur ; L. Ryelandt, Auteur . - 2011 . - pp. 2464–2476. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2464–2476 Mots-clés : TWIP steels Dislocations Twinning mechanisms Transmission electron microscopy Résumé : Although it is well known that Fe–Mn–C TWIP steels exhibit high work-hardening rates, the elementary twinning mechanisms controlling the plastic deformation of these steels have still not been characterized. The aim of the present study is to analyse the extended defects related to the twinning occurrence using transmission electron microscopy. Based on these observations, the very early stage of twin nucleation can be attributed to the pole mechanism with deviation proposed by Cohen and Weertman or to the model of Miura, Takamura and Narita, while the twin growth is controlled by the pole mechanism proposed by Venables. High densities of sessile Frank dislocations are observed within the twins at the early stage of deformation, which can affect the growth and the stability of the twins, but also the strength of these twins and their interactions with the gliding dislocations present in the matrix. This experimental evidence is discussed and compared to recent results in order to relate the defects analysis to the macroscopic behaviour of this category of material. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008787

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