In-situ investigation of quenching and partitioning by High Energy X-Ray Diffraction experiments

S. Y. P. Allain (1) , Guillaume Geandier (1) , Jean-Christophe Hell (2) , Michel Soler (2) , Fréderic Danoix (3) , Mohamed Gouné (4)

1 IJL - Institut Jean Lamour
2 ArcelorMittal Maizières Research SA
3 GPM - Groupe de physique des matériaux
4 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We report the first ultra-fast time-resolved quantitative information on the quenching and partitioning process of conventional high strength steel by in-situ High Energy X-Ray Diffraction experiment. The time and temperature evolutions of phase fractions, their carbon content and internal stresses were determined. The austenite to martensite transformation below Ms is followed by a stagnant stage during which microstructural state remained unchanged. Afterwards, a fast kinetics of carbon enrichment of austenite during the partitioning step at 400 °C is highlighted. The analysis proposed supports the carbon diffusion from martensite to austenite as the main mechanisms responsible for this enrichment.

Mots clés: In-situ High Energy X-Ray Diffraction; Quenching and partitioning; Phase transformation; Partitioning; Steels

Domaines: Matériaux

S. Y. P. Allain, Guillaume Geandier, Jean-Christophe Hell, Michel Soler, Fréderic Danoix, et al.. In-situ investigation of quenching and partitioning by High Energy X-Ray Diffraction experiments. Scripta Materialia, 2017, 131, pp.15-18. ⟨10.1016/j.scriptamat.2016.12.026⟩. ⟨hal-01441717⟩