Influence of deformation on austenite to ferrite transformation in low carbon steels: experimental approach and modelling

Sophie Lacroix, Yves Bréchet, Muriel Véron, David Quidort, Matthieu Kandel, Thierry Iung

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

11 Citations (Scopus)

Abstract

This work provides quantitative experimental evaluation and new insights into the coupling mechanisms between the deformation of austenite and its transformation into ferrite. A Fe-0.16C-1.4Mn steel after different torsion ratios in the austenitic range is considered. Interrupted isothermal holdings at different transformation temperatures are used to follow ferrite transformation from a large austenitic grain size. Metallographical observations show intragranular nucleation near austenite grain boundaries and inside deformation bands on top of classical ferrite at grain boundaries. A kinetic model for phase transformation is proposed. It accounts for two contributions to the kinetics of ferrite transformation: 1) austenite grain shape modification due to deformation and 2) formation of two types of ferrite, one at grain boundaries, and one inside the grains induced by plasticity. This model describes correctly our experimental kinetics and can be applied to continuous cooling.

Original languageEnglish
Title of host publicationA Symposium on the Thermodynamics, kinetics, Characterizaion and Modeling of
Subtitle of host publicationAustenite Formation and Decomposition
EditorsE.B. Damm, M.J. Merwin
Pages367-379
Number of pages13
Publication statusPublished - 2003
Externally publishedYes
EventMaterials Science and Technology Conference 2003 - Chicago, United States of America
Duration: 9 Nov 200312 Nov 2003

Publication series

NameMaterials Science and Technology 2003 Meeting

Conference

ConferenceMaterials Science and Technology Conference 2003
Abbreviated titleMS&T 2003
CountryUnited States of America
CityChicago
Period9/11/0312/11/03

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