Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy / Y. C. Liu in Acta materialia, Vol. 58 N° 3 (Fevrier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 753-763 Titre : Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy Type de document : texte imprimé Auteurs : Y. C. Liu, Auteur ; F. Sommer, Auteur ; E. J. Mittemeijer, Auteur Article en page(s) : pp. 753-763 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ferrite–austenite transformation Substitutional Fe-based alloys Applied compressive stress Annealing Dilatometer Index. décimale : 669 Métallurgie Résumé : Differential dilatometry has been employed to study the kinetics of the massive ferrite (α) → austenite (γ) transformation upon isochronal heating (i.e. austenitization) of the substitutional Fe–2.96 at.% Ni alloy subjected to a range of applied constant uniaxial compressive stresses. A phase-transformation model, involving site saturation, interface-controlled (continuous) growth and incorporating an impingement correction for an intermediate of the cases of ideally periodically and of ideally randomly dispersed growing particles, has been employed to extract the interface-migration velocity of the α/γ interface and the transformation-induced deformation energy taken up by the specimen. The value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the α/γ volume misfit depends on the austenite fraction and increases distinctly with an increase in the applied uniaxial compressive stress, which is compensated by, in particular, an increase in the chemical driving force corresponding to an increase in the onset temperature. The opposite effects of an applied uniaxial compressive stress on the α → γ transformation and on the γ → α transformation can be discussed as the outcome of constrained plastic deformation due to transformation-induced strain. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy [texte imprimé] / Y. C. Liu, Auteur ; F. Sommer, Auteur ; E. J. Mittemeijer, Auteur . - pp. 753-763. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 753-763 Mots-clés : Ferrite–austenite transformation Substitutional Fe-based alloys Applied compressive stress Annealing Dilatometer Index. décimale : 669 Métallurgie Résumé : Differential dilatometry has been employed to study the kinetics of the massive ferrite (α) → austenite (γ) transformation upon isochronal heating (i.e. austenitization) of the substitutional Fe–2.96 at.% Ni alloy subjected to a range of applied constant uniaxial compressive stresses. A phase-transformation model, involving site saturation, interface-controlled (continuous) growth and incorporating an impingement correction for an intermediate of the cases of ideally periodically and of ideally randomly dispersed growing particles, has been employed to extract the interface-migration velocity of the α/γ interface and the transformation-induced deformation energy taken up by the specimen. The value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the α/γ volume misfit depends on the austenite fraction and increases distinctly with an increase in the applied uniaxial compressive stress, which is compensated by, in particular, an increase in the chemical driving force corresponding to an increase in the onset temperature. The opposite effects of an applied uniaxial compressive stress on the α → γ transformation and on the γ → α transformation can be discussed as the outcome of constrained plastic deformation due to transformation-induced strain. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

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Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy / Y. C. Liu in Acta materialia, Vol. 58 N° 3 (Fevrier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 753–763 Titre : Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy Type de document : texte imprimé Auteurs : Y. C. Liu, Auteur ; F. Sommer, Auteur ; E. J. Mittemeijer, Auteur Année de publication : 2011 Article en page(s) : pp. 753–763 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ferrite–austenite transformation Substitutional Fe-based alloys Applied compressive stress Annealing Dilatometer Résumé : Differential dilatometry has been employed to study the kinetics of the massive ferrite (α) → austenite (γ) transformation upon isochronal heating (i.e. austenitization) of the substitutional Fe–2.96 at.% Ni alloy subjected to a range of applied constant uniaxial compressive stresses. A phase-transformation model, involving site saturation, interface-controlled (continuous) growth and incorporating an impingement correction for an intermediate of the cases of ideally periodically and of ideally randomly dispersed growing particles, has been employed to extract the interface-migration velocity of the α/γ interface and the transformation-induced deformation energy taken up by the specimen. The value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the α/γ volume misfit depends on the austenite fraction and increases distinctly with an increase in the applied uniaxial compressive stress, which is compensated by, in particular, an increase in the chemical driving force corresponding to an increase in the onset temperature. The opposite effects of an applied uniaxial compressive stress on the α → γ transformation and on the γ → α transformation can be discussed as the outcome of constrained plastic deformation due to transformation-induced strain. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006545 [article] Kinetics of austenitization under uniaxial compressive stress in Fe–2.96 at.% Ni alloy [texte imprimé] / Y. C. Liu, Auteur ; F. Sommer, Auteur ; E. J. Mittemeijer, Auteur . - 2011 . - pp. 753–763. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 753–763 Mots-clés : Ferrite–austenite transformation Substitutional Fe-based alloys Applied compressive stress Annealing Dilatometer Résumé : Differential dilatometry has been employed to study the kinetics of the massive ferrite (α) → austenite (γ) transformation upon isochronal heating (i.e. austenitization) of the substitutional Fe–2.96 at.% Ni alloy subjected to a range of applied constant uniaxial compressive stresses. A phase-transformation model, involving site saturation, interface-controlled (continuous) growth and incorporating an impingement correction for an intermediate of the cases of ideally periodically and of ideally randomly dispersed growing particles, has been employed to extract the interface-migration velocity of the α/γ interface and the transformation-induced deformation energy taken up by the specimen. The value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the α/γ volume misfit depends on the austenite fraction and increases distinctly with an increase in the applied uniaxial compressive stress, which is compensated by, in particular, an increase in the chemical driving force corresponding to an increase in the onset temperature. The opposite effects of an applied uniaxial compressive stress on the α → γ transformation and on the γ → α transformation can be discussed as the outcome of constrained plastic deformation due to transformation-induced strain. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006545

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