Kinetic transitions during non-partitioned ferrite growth in Fe-C-Mn alloys

Damon Panahi, Yunfei Bai, Hatem S Zurob, Gary R Purdy, Christopher R. Hutchinson, Yves Brechet

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)

Abstract

Ferrite growth behavior in Fe-C-Mn alloys has been studied using controlled decarburization experiments. Two types of kinetic transition are considered. A first transition is proposed which involves a change from ParaEquibrium (PE) contact conditions at short times to Local-Equilibrium with Negligible Partitioning at longer times (LENP). This transition is attributed to the gradual build up of an alloying element spike due to the diffusion of Mn across the interface. The cross-interface mobility of Mn is estimated based on the experimental results. In some alloys, we observe a transition to extended PE states at high temperatures. A simple model which quantitatively describes the experimental observations over a range of composition and temperature is proposed. A key feature of this model is the introduction of an alloying element capacity of the moving ferrite/austenite interface, X*. The introduction of this quantity is purely guided by the experimental data and, at present, there is no physically based method for calculating it.

Original languageEnglish
Title of host publicationSolid-Solid Phase Transformations in Inorganic Materials -International Conference Proceedings
Subtitle of host publicationAvignon, France; 6-11 June, 2010
EditorsYves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel, Frédéric Soisson
Place of PublicationSwitzerland
PublisherTrans Tech Publications
Pages539-548
Number of pages10
ISBN (Electronic)9783038135104
ISBN (Print)9783037851432
DOIs
Publication statusPublished - 2011
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM) 2010 - Avignon, France
Duration: 6 Jun 201011 Jun 2010

Publication series

NameSolid State Phenomena
Volume172-174
ISSN (Print)10120394

Conference

ConferenceInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM) 2010
Abbreviated titlePTM 2010
CountryFrance
CityAvignon
Period6/06/1011/06/10

Keywords

  • Decarburization
  • Interface capacity
  • Kinetic transitions
  • Local equilibrium
  • Paraequilibrium

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