Kinetics of sigma phase formation in a duplex stainless steel

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dc.contributor.authorMagnabosco R.
dc.date.accessioned2019-08-20T00:17:36Z
dc.date.available2019-08-20T00:17:36Z
dc.date.issued2009
dc.description.abstractThis work determines the kinetics of sigma phase formation in UNS S31803 Duplex Stainless Steel (DSS), describing the phase transformations that occur in isothermal aging between 700 and 900 °C for time periods up to 1032 hours, allowing the determination of the Time-Temperature-Precipitation (TTP) diagram for sigma phase and proposing a model to predict the kinetics of sigma phase formation using a Johnson-Mehl-Avrami (JMA) type expression. The higher kinetics of sigma phase formation occurs at 850 °C. However, isothermal aging between 700 and 900 °C for time periods up to 1032 hours are not sufficient to the establishment of thermodynamic equilibrium. Activation energy for both nucleation and growth of sigma phase is determined (185 kJ.mol-1) and its value is equivalent to the activation energy for Cr diffusion in ferrite, indicating that diffusion of Cr is probably the major thermally activated process involved in sigma phase formation. The determined JMA type expression presents good fit with experimental data between 700 and 850 °C.
dc.description.firstpage321
dc.description.issuenumber3
dc.description.lastpage327
dc.description.volume12
dc.identifier.citationMagnabosco, Rodrigo. Kinetics of sigma phase formation in a Duplex Stainless Steel. Materials Research-Ibero-american Journal of Materials, v. 12, n. 3, p. 321-327, 2009.
dc.identifier.doi10.1590/S1516-14392009000300012
dc.identifier.issn1516-1439
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/2273
dc.relation.ispartofMaterials Research
dc.rightsAcesso Aberto
dc.subject.otherlanguageDuplex stainless steels
dc.subject.otherlanguageKinetics
dc.subject.otherlanguagePhase transformations
dc.subject.otherlanguageSigma phase
dc.titleKinetics of sigma phase formation in a duplex stainless steel
dc.typeArtigo
fei.scopus.citations172
fei.scopus.eid2-s2.0-73349100041
fei.scopus.subjectDuplex stainless steel
fei.scopus.subjectJohnson-mehl-avrami
fei.scopus.subjectNucleation and growth
fei.scopus.subjectSigma phase
fei.scopus.subjectSigma phase formation
fei.scopus.subjectThermally activated process
fei.scopus.subjectThermodynamic equilibria
fei.scopus.subjectTime-temperature-precipitation
fei.scopus.updated2024-03-04
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=73349100041&origin=inward
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