Micromechanical impact of solidification regions in ductile iron revealed via a 3D strain partitioning analysis method

Strain partitioning between first-to-solidify (FTS) and last-to-solidify (LTS) regions upon tensile loading of ductile iron was investigated by combining in-situ X-ray tomography with digital volume correlation and postmortem metallographic examinations. The results indicate that the plastic shear b...

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Bibliographic Details
Published in:Scripta materialia 2020-03, Vol.178, p.463-467
Main Authors: Xu, C.L., Andriollo, T., Zhang, Y.B., Hernando, J.C., Hattel, J., Tiedje, N.
Format: Article
Language:English
Subjects:
Cast iron
Digital volume correlation
Digital volume correlations
Distance functions
Ductility
Graphite particles
Metallographic examination
Micromechanics
Microstructural heterogeneity
Solidification
Solidification microstructure
Solidification microstructures
Strain distribution
Strain distributions
Strain measurement
Strain partitioning
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Summary:Strain partitioning between first-to-solidify (FTS) and last-to-solidify (LTS) regions upon tensile loading of ductile iron was investigated by combining in-situ X-ray tomography with digital volume correlation and postmortem metallographic examinations. The results indicate that the plastic shear bands form mainly by linking graphite particles contained in the same FTS region. A special distance function is introduced to show that this is due to the lower strength of the FTS regions compared to the LTS regions, but also to the higher stress concentration associated with the particles. The methodology is general and therefore extendable to material systems containing similar microstructural heterogeneities. [Display omitted]
ISSN:1359-6462
1872-8456
1872-8456
DOI:10.1016/j.scriptamat.2019.12.018