| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
In Situ & Post Mortem Investigations of Carbide-free Bainitic Transformations during Continuous Cooling |
| Author(s) |
Cécile Rampelberg, Guillaume Geandier, Florimonde Lebel, Sebastien Y.P. Allain, Julien Teixeira, Thomas Sourmail |
| On-Site Speaker (Planned) |
Sebastien Y.P. Allain |
| Abstract Scope |
Carbide-Free Bainites are multiphase microstructures made of a lath ferritic matrix without carbide, retained austenite stabilized by carbon partitioning and martensite. We have investigated the formation of such microstructures from a fully austenitic state along different thermal treatments (isothermal holdings and continuous cooling treatments) by in situ High Energy X-Ray Diffraction (HEXRD) on synchrotron beamlines. Very precise carbon mass balances between the constituting phases have been established for the first time leading to the conclusions that the ferritic bainite is even more supersaturated in carbon than expected. The continuous cooling experiments have also proved that the bainitic transformation is highly sensitive to the transformation sequences. This result is corroborated with our post mortem Electron Back-Scattered Diffraction (SEM-EBSD) observations which reveal that microstructures after continuous cooling show very large distributions of sizes, morphologies and microtextures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Iron and Steel, Characterization |