| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Use of Large Scale Facilities to Understand the Physical Metallurgy of Fe-based Alloys
|
| Presentation Title |
HEXRD and SAXS to Unveil the Dynamics of Phase Transformation in Steels: From Carbide-free Bainite To Mapping of Compositionally Graded Samples |
| Author(s) |
Imad-Eddine Benrabah, Z. Tournoud, Frédéric Bonnet, Frederic De Geuser, Alexis Deschamps, D. Huin, P. Donnadieu, Hugo Van Landeghem |
| On-Site Speaker (Planned) |
Alexis Deschamps |
| Abstract Scope |
This presentation will illustrate how the use of synchrotron in-situ experiments helps to reach a quantitative characterization of phase transformations in steels. First, in-situ high energy X-ray diffraction (HEXRD) and in-situ small-angle X-ray scattering (SAXS) will be applied to follow how the bainite transformation in TRIP-aided bainitic steels is modified by the addition of microalloying (V or Nb). HEXRD is used to follow the austenite and ferrite phase fractions as well as the carbon content of austenite. SAXS is used to follow the formation of nanometer-scale transition carbides.
In the second part of this talk, we will show that the in-situ HEXRD experiments can be extended to be spatially-resolved on compositionally-graded steels, in order to achieve by a combinatorial approach a map of phase transformation kinetics in compositional space. Fe-X1-X2-C alloys with composition gradients have been obtained, where Xi=(Mn, Mo, Cr, Si). The evolution of austenite and ferrite phase fractions have been followed in these gradients in-situ during inter-critical annealing, in order to evaluate the solute drag effect when several substitutional species are involved. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |