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Growth of Spheroidal Graphite: Light Versus Scanning and Transmission Electron Microscopies

Bourdie, Jacques and Lacaze, Jacques and Josse, Claudie and Laffont, Lydia Growth of Spheroidal Graphite: Light Versus Scanning and Transmission Electron Microscopies. (2019) International Journal of Metalcasting. 1-9. ISSN 1939-5981

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Official URL: https://doi.org/10.1007/S40962-019-00388-Z

Abstract

Much effort has been put in the past for describing the structure of graphite spheroids and for suggesting a growth mechanism from these observations. Many theories have emerged, but none of them is yet fully established and accepted 70 years after the patent on manufacturing spheroidal graphite cast irons. In the meantime, observations with optical microscopy have become more and more challenged by electron microscopy, either in scanning or in transmission mode. However, conclusions drawn from these various types of observations sometimes appear conflicting. This unsatisfactory situation is here investigated for three special features of spheroidal graphite, namely: (i) the crystalline quality of graphite in the spheroids; (ii) the curved leaf-like overgrowth at the outer surface of spheroids; (iii) the radial structure that is evidenced with optical microscopy. The present results lead to sustain that the mechanism of graphite growth remains the same during the whole solidification process of spheroidal cast irons.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Other partners > Saint-Gobain (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
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Deposited On:09 Mar 2020 15:21

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