Redistribution of alloying elements during tempering of a nanocrystalline steel

Redistribution of alloying elements during tempering of a novel nanocrystalline steel consisting of a mixture of lower bainitic ferrite and carbon-enriched retained austenite has been analyzed by atom probe tomography. Three physical processes, namely redistribution of substitutional solute across t...

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Bibliographic Details
Published in:Acta materialia 2008, Vol.56 (2), p.188-199
Main Authors: Caballero, F.G., Miller, M.K., Garcia-Mateo, C., Capdevila, C., Babu, S.S.
Format: Article
Language:English
Subjects:
Applied sciences
Atom probe field ion microscopy (AP-FIM)
Bainitic steels
Cementite
Decomposition
Exact sciences and technology
Ferrite
Metals. Metallurgy
Nanocrystals
Phase transformations
Precipitation
Retained austenite
Steels
Tempering
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Summary:Redistribution of alloying elements during tempering of a novel nanocrystalline steel consisting of a mixture of lower bainitic ferrite and carbon-enriched retained austenite has been analyzed by atom probe tomography. Three physical processes, namely redistribution of substitutional solute across the austenite/bainitic ferrite interface before retained austenite decomposition, redistribution of solute across the lower bainite cementite/ferrite interface, and the precipitation of transition carbides and cementite, have been observed. Results suggest that retained austenite decomposes during tempering before full equilibrium is reached at the interface. Moreover, cementite precipitates from supersaturated ferrite via a paraequilibrium transformation mechanism.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2007.09.018