A graphite nodule growth model validated by in situ synchrotron x-ray tomography
File(s)GraphiteGrowthModel_MSMSE_revision1_30092018.pdf (12.45 MB)
Accepted version
Author(s)
Type
Journal Article
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.
Date Issued
2018-11-12
Date Acceptance
2018-10-19
ISSN
0965-0393
Publisher
IOP Publishing
Journal / Book Title
Modelling and Simulation in Materials Science and Engineering
Volume
26
Issue
8
Copyright Statement
© 2018 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Modelling and Simulation in Materials Science and Engineering. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://dx.doi.org/10.1088/1361-651X/aae9ce
Subjects
0912 Materials Engineering
Materials
Publication Status
Published
Date Publish Online
2018-11-12