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Elucidation of the solidification sequence of a complex graphitic HSS alloy under a combined approach of DTA and EBSD analyses

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Abstract

In this work, a complex graphitic high-speed steel (Gr-HSS) obtained from a spin-casting process that allows high cooling rates during solidification is considered. Differential thermal analysis is carried out at a moderate and constant heating scan speed until complete remelting. This allows linking each of the peaks observed in the DTA curve to a related phase transformation that had occurred during the initial solidification in the spin-casting process. The phases that were formed during the spin-casting process, especially solidification carbides, are characterized through light microscopy (distribution) and scanning electron microscopy (morphology) either associated with EDS (chemical composition) or associated with EBSD (crystal lattice identification). A discussion is opened about the influence of solidification rates on both supersaturation and lattice distortions in the solidification carbides. The combination of reverse DTA and SEM/EDS–EBSD applied here to the complex Gr-HSS alloy constitutes a relevant approach to understand the phase transformations during complex casting processes where relatively high solidification rates are achieved.

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Acknowledgements

The authors acknowledge the CAREM of the ULiège for providing SEM/EDS/EBSD facilities. They also wish to kindly thank the retired professor Jacqueline Lecomte-Beckers for all the chances and the inspiration that she offered to the MMS unit.

Funding

This work has been supported by the Service Public de Wallonie (ENDEFINU project—Grant Number 6929).

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Authors and Affiliations

  1. Metallic Materials Science (MMS), University of Liège, Quartier Polytech 1; Allée de la Découverte 13 (B52), 4000, Liège, Belgium

    Tommaso Maurizi Enrici, Anne Mertens & Jérôme Tchoufang Tchuindjang

  2. Marichal Ketin, Verte Voie 39, 4000, Sclessin, Belgium

    Mario Sinnaeve

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  1. Tommaso Maurizi Enrici
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  2. Anne Mertens
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Correspondence to Jérôme Tchoufang Tchuindjang.

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Maurizi Enrici, T., Mertens, A., Sinnaeve, M. et al. Elucidation of the solidification sequence of a complex graphitic HSS alloy under a combined approach of DTA and EBSD analyses. J Therm Anal Calorim 141, 1075–1089 (2020). https://doi.org/10.1007/s10973-019-09093-9

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