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Correlation between stacking fault energy and deformation microstructure in high-interstitial-alloyed austenitic steels / Tae-Ho Lee in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3173–3186 Titre : Correlation between stacking fault energy and deformation microstructure in high-interstitial-alloyed austenitic steels Type de document : texte imprimé Auteurs : Tae-Ho Lee, Auteur ; Eunjoo Shin, Auteur ; Chang-Seok Oh, Auteur Année de publication : 2011 Article en page(s) : pp. 3173–3186 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Stacking  fault  energy  Austenitic  steels  Martensitic  transformation  Twinning  Neutron  diffraction Résumé : The correlation between stacking fault energy (SFE) and deformation microstructure of high-interstitial-alloyed austenitic Fe–18Cr–10Mn–(N or N + C) alloys was investigated. As the content of the interstitial elements increased, the deformation microstructure changed in a sequence strain-induced martensitic transformation, mixture of martensite and twin, and finally deformation twin. The SFE, playing an important role in the transition of deformation microstructure, was evaluated by the Rietveld whole-profile fitting combined with the double-Voigt size–strain analysis for neutron diffraction profiles of tensile-strained bulk samples. At fixed N + C content, the ratio of mean-squared strain to stacking fault probability remained constant regardless of the accumulated strain, whereas the ratio gradually increased with increasing N + C content. Almost linear dependence of measured SFE on N + C content could be established. According to the SFE, deformation bands exhibited distinct substructures, and their particular intersecting behavior resulted in the formation of different types of products (secondary ε martensite, α′ martensite and secondary twin) at the intersecting regions. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000868 [article] Correlation between stacking fault energy and deformation microstructure in high-interstitial-alloyed austenitic steels [texte imprimé] / Tae-Ho Lee, Auteur ; Eunjoo Shin, Auteur ; Chang-Seok Oh, Auteur . - 2011 . - pp. 3173–3186. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 3173–3186 Mots-clés : Stacking  fault  energy  Austenitic  steels  Martensitic  transformation  Twinning  Neutron  diffraction Résumé : The correlation between stacking fault energy (SFE) and deformation microstructure of high-interstitial-alloyed austenitic Fe–18Cr–10Mn–(N or N + C) alloys was investigated. As the content of the interstitial elements increased, the deformation microstructure changed in a sequence strain-induced martensitic transformation, mixture of martensite and twin, and finally deformation twin. The SFE, playing an important role in the transition of deformation microstructure, was evaluated by the Rietveld whole-profile fitting combined with the double-Voigt size–strain analysis for neutron diffraction profiles of tensile-strained bulk samples. At fixed N + C content, the ratio of mean-squared strain to stacking fault probability remained constant regardless of the accumulated strain, whereas the ratio gradually increased with increasing N + C content. Almost linear dependence of measured SFE on N + C content could be established. According to the SFE, deformation bands exhibited distinct substructures, and their particular intersecting behavior resulted in the formation of different types of products (secondary ε martensite, α′ martensite and secondary twin) at the intersecting regions. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000868