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Analysis of Local Conditions on Graphite Growth and Shape During Solidification of Ductile Cast Iron

Tiedje, NS; Bjerre, MK; Azeem, MA; Hattel, JH; Lee, PD; (2018) Analysis of Local Conditions on Graphite Growth and Shape During Solidification of Ductile Cast Iron. Transactions of the Indian Institute of Metals , 71 (11) pp. 2699-2705. 10.1007/s12666-018-1448-z. Green open access

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Abstract

3D X-ray tomography recordings have been used to study graphite growth during solidification of ductile cast iron. Using data from such recordings, it is shown how local growth conditions influence growth rate and morphology of nodules during solidification. Experiments show that it is common for nodules to gradually change shape during solidification so that sphericity decreases. It is also found that different shaped nodules can evolve in direct contact with liquid iron and also after they are encapsulated in austenite. It is observed that a significant proportion of originally complete spherical nodules become less spherical via formation of protrusions on the surface; these new surfaces are observed to grow relatively faster. It is shown that encapsulation of the graphite nodule by austenite may be incomplete and that at the end of solidification, partial encapsulation and the effect of the number of nearest graphite nodules play a crucial role in determining the final graphite morphology.

Type: Article
Title: Analysis of Local Conditions on Graphite Growth and Shape During Solidification of Ductile Cast Iron
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s12666-018-1448-z
Publisher version: https://doi.org/10.1007/s12666-018-1448-z
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Ductile Cast Iron, X-Ray Tomography, Graphite Growth, Solidification
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10062977
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