Abstract
The effects of hot deformation on the bainitic transformation of a low carbon steel during continuous cooling were comprehensively studied through in situ high-energy synchrotron X-ray diffraction, dilatometry, and ex situ microstructural characterizations. The obtained results indicated that the prior deformation of austenite at 950 °C accelerates the bainite formation at the early stages. During the ongoing of the transformation, both the overall kinetics of bainite and carbon enrichment of austenite are lower in deformed austenite. The bainitic microstructure developed from deformed austenite is more refined and presents the same retained austenite content at room temperature with slightly lower carbon content when compared with the undeformed sample. Besides, a significant higher dilatation strain was measured during the bainitic transformation in the deformed sample, which can be explained by the crystallographic texture in hot deformed austenite. The evolution of the peak broadening of the {220}γ and {211}α reflections during bainitic transformation are discussed in detail.
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Acknowledgments
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001 and the Deutsche Forschungsgemeinschaft_DFG (ZO 140/21-1). The authors gratefully acknowledge DESY for provision of beamtime as well as Norbert Schell and Andreas Stark from Helmholtz-Center-Geesthacht at beamline P07 (PETRA III-DESY) for support during the synchrotron experiments.
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Manuscript submitted September 28, 2019.
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Lemos Bevilaqua, W., Epp, J., Meyer, H. et al. In Situ Investigation of the Bainitic Transformation from Deformed Austenite During Continuous Cooling in a Low Carbon Mn-Si-Cr-Mo Steel. Metall Mater Trans A 51, 3627–3637 (2020). https://doi.org/10.1007/s11661-020-05800-6
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DOI: https://doi.org/10.1007/s11661-020-05800-6