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Microstructure Evolution and Competitive Reactions during Quenching and Partitioning of a Model Fe–C–Mn–Si Alloy

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorAOUED, Samy
hal.structure.identifierGroupe de physique des matériaux [GPM]
dc.contributor.authorDANOIX, Frédéric
hal.structure.identifierInstitut Jean Lamour [IJL]
hal.structure.identifierLabex DAMAS
dc.contributor.authorALLAIN, Sébastien
hal.structure.identifierInstitut Jean Lamour [IJL]
dc.contributor.authorGAUDEZ, Steve
hal.structure.identifierInstitut Jean Lamour [IJL]
dc.contributor.authorGEANDIER, Guillaume
hal.structure.identifierArcelorMittal Maizières Research SA
dc.contributor.authorHELL, Jean-Christophe
hal.structure.identifierArcelorMittal Maizières Research SA
dc.contributor.authorSOLER, Michel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGOUNÉ, Mohamed
dc.date.issued2020-01
dc.identifier.issn2075-4701
dc.description.abstractEnThe mechanisms behind the carbon enrichment of austenite during quenching and partitioning are still a matter of debate. This work investigates the microstructural evolution during the quenching and partitioning of a model Fe-C-Mn-Si alloy by means of in situ high energy X-ray diffraction (HEXRD) atom probe tomography, and image analysis. The ultra-fast time-resolved quantitative information about phase transformations coupled with image analysis highlights the formation of carbide-free BCT bainite, which is formed within a very short range during the reheating and partitioning step. Its transformation rate, which is a better indicator than the intrinsic volume fraction, depends on the quenching temperature (QT). It is shown to decrease with decreasing QT, from 45% at QT = 260 °C to 20% at QT = 200 °C. As a consequence, a significant part of the carbon enrichment observed in austenite can be attributed to bainite transformation. Furthermore, a large part of carbon was shown to be trapped into martensite. Both the formation of Fe2.6C iron carbides and the segregation of carbon on lath boundaries in martensite were highlighted by atom probe tomography. The energy for carbon segregation was determined to be 0.20 eV, and the carbon concentration on the lath boundaries was obtained to be around 25 at %. Therefore, the carbon enrichment of austenite is the result of competitive reactions such as carbon partitioning from martensite, bainite transformation, and carbon trapping in martensite.
dc.description.sponsorshipPartition du carbone dans les phases ferritiques nanostructurées: cinétiques et microstructures
dc.description.sponsorshipDesign des Alliages Métalliques pour Allègement des Structures - ANR-11-LABX-0008
dc.description.sponsorshipGroupe d'Etudes et de Nanoanalyses des Effets d'IrradiationS
dc.language.isoen
dc.publisherMDPI
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enpartitioning
dc.subject.enatom probe tomography
dc.subject.enhigh-energy X-ray diffraction
dc.subject.ensteels
dc.subject.enquenching and partitioning
dc.title.enMicrostructure Evolution and Competitive Reactions during Quenching and Partitioning of a Model Fe–C–Mn–Si Alloy
dc.typeArticle de revue
dc.identifier.doi10.3390/met10010137
dc.subject.halSciences de l'ingénieur [physics]
dc.subject.halSciences de l'ingénieur [physics]/Matériaux
bordeaux.journalMetals
bordeaux.page137 (22 p.)
bordeaux.volume10
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-02445154
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02445154v1
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