|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations in Multi-component Systems: An MPMD Symposium Honoring Gary R. Purdy
||In Situ Investigations of Partitioning Mechanisms in Q&P Steels by Synchrotron Diffraction Experiments
||Sébastien Y.P. Allain, Guillaume Geandier, Jean-Christophe Hell, Michel Soler, Mohamed Goune, Frédéric Danoix
|On-Site Speaker (Planned)
||Sébastien Y.P. Allain
Quenching & Partitioning is a new annealing route that relies on the formation of a mixed martensite and austenite microstructure by an interrupted quench (Quenching) followed by carbon redistribution from supersaturated martensite to austenite (Partitioning) at higher temperature. The Q&P treatment on high C TRIP steel (Fe-0.3%.wtC-2.5%.wtMn-1.5%.wtSi-0.8%.wtCr) has been studied by the means of in situ X-Ray diffraction experiments using a synchrotron source (fast acquisition rate).
We have undoubtedly identified an unexpected increase in the ferritic phase fraction during the partitioning step with a sudden change in the evolution of the lattice parameters of the phases. Two possible competing mechanisms could then be invoked: the carbon partitioning through a mobile interface (CCE condition not strictly respected) or a carbide-free bainitic transformation. The CFB transformation alone is however not sufficient to explain the carbon content in austenite after final cooling. No carbide precipitation has been detected during the studied annealing cycles.
||Planned: A print-only volume