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Application of interrupted cooling experiments to study the mechanism of bainitic ferrite formation in steels

hal.structure.identifierFaculty of Aerospace Engineering [Delft]
dc.contributor.authorCHEN, Hao
hal.structure.identifierKTH Royal Institute of Technology [Stockholm] [KTH ]
dc.contributor.authorBORGENSTAM, Annika
hal.structure.identifierKTH Royal Institute of Technology [Stockholm] [KTH ]
dc.contributor.authorODQVIST, Joakim
hal.structure.identifierArcelorMittal Maizières Research SA
dc.contributor.authorZUAZO, Iam
hal.structure.identifierArcelorMittal Maizières Research SA
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGOUNÉ, Mohamed
hal.structure.identifierKTH Royal Institute of Technology [Stockholm] [KTH ]
dc.contributor.authorÅGREN, John
hal.structure.identifierFaculty of Aerospace Engineering [Delft]
dc.contributor.authorVAN DER ZWAAG, Sybrand
dc.date.issued2013
dc.identifier.issn1359-6454
dc.description.abstractEnNew interrupted cooling experiments have been designed to study the kinetics of bainitic ferrite formation starting from a mixture of austenite and bainitic ferrite. It is found that the kinetics of bainitic ferrite formation during the cooling stage is determined by the isothermal holding time. The formation rate of bainitic ferrite at the beginning of the cooling decreases with increasing prior isothermal holding time. An unexpected stagnant stage during the cooling stage appears when the isothermal holding time increases to a critical point. There are two reasons for the occurrence of the stagnant stage: (i) a solute spike in front of the interface; and (ii) kinetic transition. A so-called Gibbs energy balance approach, in which the dissipation of Gibbs energy due to diffusion inside the interface and interface friction is assumed to be equal to the available chemical driving force, is applied to theoretically explain the stagnant stage. A kinetics transition from a fast growth mode without diffusion of Mn and Si inside the austenite-bainitic ferrite interfaces to a slow growth mode with diffusion inside the interface is predicted. The stagnant stage is caused by the transition to a slow growth mode. The Gibbs energy balance approach describes the experimental observations very well.
dc.language.isoen
dc.publisherElsevier
dc.subject.enSolute drag
dc.subject.enAustenite
dc.subject.enBainitic ferrite
dc.subject.enInterface migration
dc.subject.enTransformation kinetics
dc.subject.enDissipation of gibbs energy
dc.title.enApplication of interrupted cooling experiments to study the mechanism of bainitic ferrite formation in steels
dc.typeArticle de revue
dc.identifier.doi10.1016/j.actamat.2013.04.020
dc.subject.halChimie/Matériaux
bordeaux.journalActa Materialia
bordeaux.page4512-4523
bordeaux.volume61
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-00836005
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00836005v1
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