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A graphite nodule growth model validated by in situ synchrotron x-ray tomography

Bjerre, MK; Azeem, MA; Tiedje, NS; Thorborg, J; Lee, PD; Hattel, JH; (2018) A graphite nodule growth model validated by in situ synchrotron x-ray tomography. Modelling and Simulation in Materials Science and Engineering , 26 , Article 085012. 10.1088/1361-651X/aae9ce.

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Abstract

An accurate prediction of ductile cast iron (DCI) microstructures is crucial for a science-based optimisation of cast component design. The number density and distribution of graphite nodules critically influence the mechanical performance of a component in service. Although models predicting nodule growth have been researched for many years, recent improvements have been impeded by lack of detailed experimental data on nodule growth kinetics for validation. This data has now been made available through in situ observations of the solidification of DCI using synchrotron x-ray tomography in combination with a high temperature environmental cell. In the present investigation, a new sphere of influence (SoI) model for spheroidal graphite growth is proposed. It inherently incorporates the competition for carbon between neighbouring nodules and the depletion of carbon in the matrix. Comparing simulation results to the in situ observations of graphite growth, the SoI model successfully predicts both growth of individual nodules as well as the size distribution of a large nodule population during solidification.

Type: Article
Title: A graphite nodule growth model validated by in situ synchrotron x-ray tomography
DOI: 10.1088/1361-651X/aae9ce
Publisher version: https://doi.org/10.1088/1361-651X/aae9ce
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, graphite nodules, microstructural modelling, synchrotron x-ray tomography, 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/10063386
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