Journal Article

PUBDB-2015-02942

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In situ synchrotron X-ray diffraction and dilatometric study of austenite formation in a multi-component steel: Influence of initial microstructure and heating rate

Esin, V. A. (Corresponding author) ; Denand, B.>Extern* ; Le Bihan, Q. ; Dehmas, M.>Extern* ; Teixeira, J.>Extern* ; Geandier, G.>Extern* ; Denis, S.>Extern* ; Sourmail, T. ; Aeby-Gautier, E.>Extern*

2014
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.actamat.2014.07.042

Abstract: 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.

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Contributing Institute(s):

1. Zentrum für Material- und Küstenforschung (HZG)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)
2. PETRA Beamline P07 (POF2-54G14) (POF2-54G14)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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