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The mechanisms of the fcc–bcc martensitic transformation revealed by pole figures / Cyril Cayron in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1395–1402 Titre : The mechanisms of the fcc–bcc martensitic transformation revealed by pole figures Type de document : texte imprimé Auteurs : Cyril Cayron, Auteur ; Françoise Barcelo, Auteur ; Yann De Carlan, Auteur Année de publication : 2011 Article en page(s) : pp. 1395–1402 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : EBSD  Martensitic  phase  transformation  Pole  figure Résumé : Face-centered cubic (fcc) to body-centered cubic (bcc) martensitic transformations occur in many materials, such as steels, FeNi meteorites or brass. The phenomenological theory has been the accepted theory for these transformations for more than half a century. However, it cannot explain the continuous singular features in the experimental electron backscatter diffraction or X-ray diffraction pole figures. Here we show that such patterns can be simulated by one discrete orientation relationship and two continuous rotations that correspond to a trace of the transformation mechanisms. A new theory of martensite transformation that is in full agreement with the experimental pole figures is proposed. In this theory, the fcc–bcc transformation results from a fcc–hexagonal close-packed (hcp) step followed by an hcp–bcc step. The advantages of this two-step theory over the phenomenological theory are discussed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007496 [article] The mechanisms of the fcc–bcc martensitic transformation revealed by pole figures [texte imprimé] / Cyril Cayron, Auteur ; Françoise Barcelo, Auteur ; Yann De Carlan, Auteur . - 2011 . - pp. 1395–1402. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1395–1402 Mots-clés : EBSD  Martensitic  phase  transformation  Pole  figure Résumé : Face-centered cubic (fcc) to body-centered cubic (bcc) martensitic transformations occur in many materials, such as steels, FeNi meteorites or brass. The phenomenological theory has been the accepted theory for these transformations for more than half a century. However, it cannot explain the continuous singular features in the experimental electron backscatter diffraction or X-ray diffraction pole figures. Here we show that such patterns can be simulated by one discrete orientation relationship and two continuous rotations that correspond to a trace of the transformation mechanisms. A new theory of martensite transformation that is in full agreement with the experimental pole figures is proposed. In this theory, the fcc–bcc transformation results from a fcc–hexagonal close-packed (hcp) step followed by an hcp–bcc step. The advantages of this two-step theory over the phenomenological theory are discussed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007496