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On the role of impurities on spheroidal graphite degeneracy in cast irons

Domengès, Bernadette and Celis, Mayerling Martinez and Moisy, Florent and Lacaze, Jacques and Tonn, Babette On the role of impurities on spheroidal graphite degeneracy in cast irons. (2021) Carbon, 172. 529-541. ISSN 0008-6223

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Official URL: https://doi.org/10.1016/J.CARBON.2020.10.030

Abstract

Though manufacturing spheroidal graphite cast irons is a well-established industrial process, good nodularity which is essential for mechanical properties may be hampered by several factors. Amongst them is the presence of impurities at trace level which lead to the growth of protrusions and the question is how they can destroy the spheroidizing effect of magnesium. For the first time, it is shown that such impurities are present together with magnesium at the interface between spheroid and protrusion. For getting this result, site-specific electron transparent lamellae were prepared using Focused Ion Beam and characterized at nanometric scale using atomic resolution scanning-transmission electron microscope. It is also shown by automatic crystal orientation mapping that there is no definite crystallographic relationship between protrusions and underlying spheroids.

Item Type:Article
HAL Id:hal-03182250
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Clausthal University of Technology (GERMANY)
Other partners > Ecole Nationale Supérieure d'Ingénieurs de Caen - ENSICAEN (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Normandie Université (FRANCE)
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Funders:
Agence Nationale de la Recherche - ANR
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Deposited On:26 Mar 2021 10:21

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