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Communication Dans Un Congrès Année : 2023

High temperature EBSD experiment applied to in-situ observation of phase transformation in steels

Résumé

The mechanical properties of steels strongly depend on the high temperature austenite microstructure and the subsequent phase transformation events occurring during cooling that control the final microstructure. Thus, the analysis of the austenite parent phase is key to improve our understanding of the inherited microstructures. Indirect parent-phase reconstruction has been introduced as a possibility to calculate the parent grain orientations from the orientation data of the low temperature phase, based on the orientation relation between the two phases [1]. Even if this approach often gives powerful information, it only works on displacive transformation microstructures and may fail for some specific configurations (ex. reconstruction of twin boundaries or parent grains transformed with strong variant selection). Nowadays, the development of compact hot stages compatible with EBSD working conditions as well as the emergence of high-speed EBSD camera open a promising way to track direct microstructure evolutions induced by phase transformations by high temperature EBSD analysis [2]. In this work we have performed state of the art in-situ HT EBSD experiments on ferritic stainless steels (10 to 12%Cr) with and without ODS (Oxides Dispersed Strengthening). Our purpose is to monitor the ferrite to austenite transformation during heating to (1) identify the preferential nucleation sites of austenite according to the initial microstructure, (2) the presence of non-transformed ferrite and (3) characterize the HT austenite microstructure expected to be nanosized [3]. We aim to give a feedback on advantages and drawbacks of in- situ HT EBSD analysis applied to phase transformation and its complement to indirect crystallographic reconstruction. [1]Germain, L., N. Gey, R. Mercier, P. Blaineau, et M. Humbert. « An advanced approach to reconstructing parent orientation maps in the case of approximate orientation relations: Application to steels ». Acta Materialia 60, no 11 (2012): 4551‑62. https://doi.org/10.1016/j.actamat.2012.04.034. [2]Ubhi, H. S., J. Parsons, N. Othen, S. Campbell, R. Poole, et A. Gholinia. « In-situ EBSD phase transformation and recrystallisation ». Journal of Physics: Conference Series 522, no 1 (2014). https://doi.org/10.1088/1742- 6596/522/1/012011. [3]Durand, Anthony, Denis Sornin, Yann de Carlan, Gabriel Spartacus, François Brisset, Ludovic Delbes, Benoît Baptiste, Thierry Baudin, et Roland Logé. « Characterization of Untransformed Ferrite in 10Cr and 12Cr ODS Steels ». Materialia 16 (mai 2021): 101066. https://doi.org/10.1016/j.mtla.2021.101066.
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Dates et versions

hal-04306580 , version 1 (25-11-2023)

Identifiants

  • HAL Id : hal-04306580 , version 1

Citer

Maissa Fekih, Tomas Martinez Ostormujof, Denis Sornin, L Germain, Nathalie Gey. High temperature EBSD experiment applied to in-situ observation of phase transformation in steels. Metallurgie Quel Avenir, Jun 2023, Grenoble, France. ⟨hal-04306580⟩
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