Volume 3, 2019
|Number of page(s)||6|
|Published online||12 February 2019|
From the microstructure of steels to the explosion of sparks
Ecole polytechnique, Route de Saclay, 91120 Palaiseau, France
2 LadHyX, UMR 7646 du CNRS, Ecole polytechnique, 91128 Palaiseau Cedex, France
* e-mail: email@example.com
Accepted: 2 January 2019
Sparks ejected by the grinding of steel can be observed to split in mid-flight. In this paper, we investigate the link between steel microstructure and the splitting behavior using two different steels: hypoeutectoid (containing less than 0:8% carbon) and hypereutectoid (>0:8% carbon). We used a high-speed camera filming at 1000 fps to observe the sparks, and a Scanning Electron Microscope to image the microstructures. For the hypoeutectoid steel, we also quantified the splitting behavior of the sparks by measuring the statistical distribution of the linear distance they travel before splitting occurs. We find that our results are coherent with the common explanation of the splitting phenomenon, stating that sparks split because their microstructures allow the formation of pockets of CO2 by oxidation of Fe3C, producing an internal pressure and leading to explosion.
Key words: Metallurgy / steel / microstructure / sparks / explosion
© A. Guillen et al., Published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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