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In-Situ Characterization by High-Energy X-ray Diffraction of the Phase Transformations Leading to Transformation-Induced Plasticity-Aided Bainitic Steel
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Use of Space-Resolved in-Situ High Energy X-ray Diffraction for the Characterization of the Compositional Dependence of the Austenite-to-Ferrite Transformation Kinetics in Steels

1
CNRS, Grenoble INP, SIMaP, Université Grenoble Alpes, 38000 Grenoble, France
2
Research, ArcelorMittal, 57280 Maizieres-les-Metz, France
*
Author to whom correspondence should be addressed.
Quantum Beam Sci. 2020, 4(1), 1; https://doi.org/10.3390/qubs4010001
Received: 22 October 2019 / Revised: 9 December 2019 / Accepted: 16 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Microstructural and Phase Transformations in Materials)
In-situ high energy X-Ray diffraction (HEXRD) was used on compositionally graded steels to study the effect of substitutional elements on ferrite growth kinetics in Fe–C–X and Fe–C–X–Y systems. Two systems were selected to illustrate the applicability of the combinatorial approach in studying such transformations, Fe–C–Mn and Fe–C–Mn–Mo. Comparison between the measured ferrite growth kinetics using HEXRD and the predicted ones using Para-Equilibrium (PE) and Local Equilibrium with Negligible Partitioning (LENP) models indicates that the fractions reached at the stasis of transformation are lower than the predicted ones. Experiments indicated a deviation of measured kinetics from both PE and LENP models when increasing Mn and decreasing Mo (in Fe–C–Mn–Mo system). The large amount of data that can be obtained using this approach can be used for validating existing models describing ferrite growth kinetics. View Full-Text
Keywords: high energy X-ray diffraction; combinatorial metallurgy; transformation kinetics high energy X-ray diffraction; combinatorial metallurgy; transformation kinetics
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Benrabah, I.-E.; Van Landeghem, H.P.; Bonnet, F.; Robaut, F.; Deschamps, A. Use of Space-Resolved in-Situ High Energy X-ray Diffraction for the Characterization of the Compositional Dependence of the Austenite-to-Ferrite Transformation Kinetics in Steels. Quantum Beam Sci. 2020, 4, 1.

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