%0 Journal Article
%A Esin, V. A.
%A Denand, B.
%A Le Bihan, Qu.
%A Dehmas, M.
%A Teixeira, J.
%A Geandier, G.
%A Denis, S.
%A Sourmail, T.
%A Aeby-Gautier, E.
%T In situ synchrotron X-ray diffraction and dilatometric study of austenite formation in a multi-component steel: Influence of initial microstructure and heating rate
%J Acta materialia
%V 80
%@ 1359-6454
%C Amsterdam [u.a.]
%I Elsevier Science
%M PUBDB-2015-02942
%P 118 - 131
%D 2014
%X The formation of austenite during both slow and fast heating (0.25–100 C s1) was investigated for different microstructures of aselected low-alloy steel. With the simultaneous use of dilatometry and high-energy X-ray diffraction, it was possible to follow not onlythe global progress of the austenitization, but also the individual evolutions of each phase (ferrite, cementite and retained austenite ifpresent in the initial microstructure). The results confirm earlier published data regarding the ease of austenitization of different initialmicrostructures (ferrite–pearlite, bainite and tempered martensite). More importantly, two stages were clearly identified, correspondingto the simultaneous transformation of ferrite and cementite, followed by the progressive disappearance of the remaining ferrite. Whilethis is well known for ferrite–pearlite microstructures, it is not yet documented for bainite and tempered martensite. Microstructure evolutioncalculations based on a diffusion-controlled mechanism helped rationalize the differences observed between the three initial microstructures.In addition, they also strongly suggested the existence of a critical carbide size beyond which the second austenitization phasewould correspond to carbide dissolution instead of ferrite transformation.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000344208300011
%R 10.1016/j.actamat.2014.07.042
%U https://bib-pubdb1.desy.de/record/221888