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Micromechanics of high-temperature damage in dual-phase stainless steel / B. Chéhab in Acta materialia, Vol. 58 N° 2 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 626-637 Titre : Micromechanics of high-temperature damage in dual-phase stainless steel Type de document : texte imprimé Auteurs : B. Chéhab, Auteur ; Y. Bréchet, Auteur ; M. Véron, Auteur Article en page(s) : pp. 626-637 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Hot  working  Stainless  steels  Ductility  High-temperature  deformation  Micromechanical  modelling Index. décimale : 669 Métallurgie Résumé : High-temperature ductility of dual-phase stainless steels is investigated using a micromechanics approach of damage and fracture. Two different microstructures are studied with either a lamellar or a globular morphology of the ferrite phase, the latter being twice as ductile as the former at 1150 °C. The high-temperature damage evolution is characterized at different loading rates using notched round cylindrical bars producing different stress triaxialities, supplemented by fractographic analysis. The experimental observations have generated an advanced elasto-viscoplastic micromechanical damage model for both microstructures. With a detailed account of the process of nucleation, growth and coalescence of voids, the model properly captures the effect of stress triaxiality, strain rate, and morphology of the ferritic phase on the high-temperature ductility. The key factor controlling the loss of ductility in the lamellar microstructure is the constraint induced by the harder austenite layer on the softer ferrite zones. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Micromechanics of high-temperature damage in dual-phase stainless steel [texte imprimé] / B. Chéhab, Auteur ; Y. Bréchet, Auteur ; M. Véron, Auteur . - pp. 626-637. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 626-637 Mots-clés : Hot  working  Stainless  steels  Ductility  High-temperature  deformation  Micromechanical  modelling Index. décimale : 669 Métallurgie Résumé : High-temperature ductility of dual-phase stainless steels is investigated using a micromechanics approach of damage and fracture. Two different microstructures are studied with either a lamellar or a globular morphology of the ferrite phase, the latter being twice as ductile as the former at 1150 °C. The high-temperature damage evolution is characterized at different loading rates using notched round cylindrical bars producing different stress triaxialities, supplemented by fractographic analysis. The experimental observations have generated an advanced elasto-viscoplastic micromechanical damage model for both microstructures. With a detailed account of the process of nucleation, growth and coalescence of voids, the model properly captures the effect of stress triaxiality, strain rate, and morphology of the ferritic phase on the high-temperature ductility. The key factor controlling the loss of ductility in the lamellar microstructure is the constraint induced by the harder austenite layer on the softer ferrite zones. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]