|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||Dislocation Densities during Martensite Transformation in a Low-carbon Steel Determined by In Situ High Energy X-ray Diffraction
||Juan Agustin Macchi, Steve Gaudez, Guillaume Geandier, Julien Teixeira, Sabine Denis, Frédéric Bonnet, Sébastien Y.P Allain
|On-Site Speaker (Planned)
||Juan Agustin Macchi
The dislocation densities during the quench of a 0.215wt.%C steel in martensite and in austenite are investigated by a HEXRD in situ experiment on a synchrotron beamline. The experiment configuration offers an excellent time resolution well adapted to the investigation of martensitic transformation kinetics. The dislocation densities in both phases increase as the transformation proceeds. The dislocations densities in martensite are certainly heterogeneously distributed in between the laths according to some recent post-mortem observations. These distributions support the views assuming that lath martensite behaves as a “multiphase” aggregate. In austenite, high dislocation densities are reported at the end of martensitic transformation meaning that residual austenite is also a hard phase.