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Materials, Vol. 11, Pages 1087: In Situ Investigation of the Iron Carbide Precipitation Process in a Fe-C-Mn-Si Q&P Steel

Materials, Vol. 11, Pages 1087: In Situ Investigation of the Iron Carbide Precipitation Process in a Fe-C-Mn-Si Q&P Steel

Materials doi: 10.3390/ma11071087

Authors: Sébastien Y. P. Allain Samy Aoued Angéline Quintin-Poulon Mohamed Gouné Frédéric Danoix Jean-Christophe Hell Magali Bouzat Michel Soler Guillaume Geandier

Quenching and Partitioning (Q&P) steels are promising candidates for automotive applications because of their lightweight potential. Their properties depend on carbon enrichment in austenite which, in turn, is strongly influenced by carbide precipitation in martensite during quenching and partitioning treatment. In this paper, by coupling in situ High Energy X-Ray Diffraction (HEXRD) experiments and Transmission Electron Microscopy (TEM), we give some clarification regarding the precipitation process of iron carbides in martensite throughout the Q&P process. For the first time, precipitation kinetics was followed in real time. It was shown that precipitation starts during the reheating sequence for the steel studied. Surprisingly, the precipitated fraction remains stable all along the partitioning step at 400 °C. Furthermore, the analyses enable the conclusion that the iron carbides are most probably eta carbides. The presence of cementite was ruled out, while the presence of several epsilon carbides cannot be strictly excluded.

Authors:   Allain, Sébastien Y. P.; Aoued, Samy ; Quintin-Poulon, Angéline ; Gouné, Mohamed ; Danoix, Frédéric ; Hell, Jean-Christophe ; Bouzat, Magali ; Soler, Michel ; Geandier, Guillaume
Journal:   Materials
Volume:   11
edition:   7
Year:   2018
Pages:   1087
DOI:   10.3390/ma11071087
Publication date:   26-Jun-2018
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