ALLAIN, Sébastien; AOUED, Samy; POULON-QUINTIN, Angeline; GOUNÉ, Mohamed; DANOIX, Frederic; HELL, Jean-Christophe; BOUZAT, Magali; SOLER, Michel; GEANDIER, Guillaume

doi:10.3390/ma11071087

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ALLAIN, Sébastien
Institut Jean Lamour [IJL]

AOUED, Samy
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Groupe de physique des matériaux [GPM]

POULON-QUINTIN, Angeline
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

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Materials. 2018-07, vol. 11, n° 7, p. 1087 (11 p.)

MDPI

Resumen en inglés

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.< Leer menos

Palabras clave en inglés

steel

Q&P

transition carbide

precipitation

HEXRD

TEM

steel

DOI

http://dx.doi.org/10.3390/ma11071087

Proyecto ANR

Design des Alliages Métalliques pour Allègement des Structures - ANR-11-LABX-0008

Orígen

Importado de Hal

Centros de investigación

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026