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Dynamic recrystallization mechanisms operating in a Ni–20%Cr alloy under hot-to-warm working / N. Dudova in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3624–3632 Titre : Dynamic recrystallization mechanisms operating in a Ni–20%Cr alloy under hot-to-warm working Type de document : texte imprimé Auteurs : N. Dudova, Auteur ; A. Belyakov, Auteur ; T. Sakai, Auteur Année de publication : 2011 Article en page(s) : pp. 3624–3632 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Hot  and  warm  working  Electron  microscopy  Nickel  alloys  Dynamic  recrystallization  Ultrafine  grained  microstructure Résumé : The structural mechanisms responsible for the development of new grains in a Ni–20%Cr alloy during hot-to-warm working were studied in compression at temperatures of 500–950 °C. A bilinear relationship between the flow stresses and the dynamic grain sizes was obtained with an inflection point at 7 × 10−3G. The dynamic grain size can be related to the flow stress through power-law functions with grain size exponents of −0.7 and −0.25 for low and high flow stresses, respectively. The variation of the stress versus grain size dependence is attributed to the change in mechanisms of new grain development from discontinuous to continuous reactions with increasing flow stress. The former is associated with the grain boundary bulging and the latter is related to a strain-induced phenomenon involving the development of large angular misorientations between deformation subgrains after large strains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000131X [article] Dynamic recrystallization mechanisms operating in a Ni–20%Cr alloy under hot-to-warm working [texte imprimé] / N. Dudova, Auteur ; A. Belyakov, Auteur ; T. Sakai, Auteur . - 2011 . - pp. 3624–3632. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3624–3632 Mots-clés : Hot  and  warm  working  Electron  microscopy  Nickel  alloys  Dynamic  recrystallization  Ultrafine  grained  microstructure Résumé : The structural mechanisms responsible for the development of new grains in a Ni–20%Cr alloy during hot-to-warm working were studied in compression at temperatures of 500–950 °C. A bilinear relationship between the flow stresses and the dynamic grain sizes was obtained with an inflection point at 7 × 10−3G. The dynamic grain size can be related to the flow stress through power-law functions with grain size exponents of −0.7 and −0.25 for low and high flow stresses, respectively. The variation of the stress versus grain size dependence is attributed to the change in mechanisms of new grain development from discontinuous to continuous reactions with increasing flow stress. The former is associated with the grain boundary bulging and the latter is related to a strain-induced phenomenon involving the development of large angular misorientations between deformation subgrains after large strains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541000131X