Skip to Main content Skip to Navigation
Journal articles

An electron microscopy study of graphite growth in nodular cast irons

Abstract : Growth of graphite during solidification and high-temperature solid-state transformation has been investigated in samples cut out from a thin-wall casting which solidified partly in the stable (iron–graphite) and partly in the metastable (iron–cementite) systems. Transmission electron microscopy has been used to characterize graphite nodules in as-cast state and in samples having been fully graphitized at various temperatures in the austenite field. Nodules in the as-cast material show a twofold structure characterized by an inner zone where graphite is disoriented and an outer zone where it is well crystallized. In heat-treated samples, graphite nodules consist of well-crystallized sectors radiating from the nucleus. These observations suggest that the disoriented zone appears because of mechanical deformation when the liquid contracts during its solidification in the metastable system. During heat-treatment, the graphite in this zone recrystallizes. In turn, it can be concluded that nodular graphite growth mechanism is the same during solidification and solid-state transformation
Complete list of metadata

Cited literature [23 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01780360
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, April 27, 2018 - 2:26:00 PM
Last modification on : Friday, January 10, 2020 - 9:08:24 PM

File

Laffont_19735.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Lydia Laffont-Dantras, Rawen Jday, Jacques Lacaze. An electron microscopy study of graphite growth in nodular cast irons. Metallurgical and Materials Transactions A, Springer Verlag/ASM International, 2018, vol. 49 (n° 4), pp. 1287-1294. ⟨10.1007/s11661-018-4508-4⟩. ⟨hal-01780360⟩

Share

Metrics

Record views

108

Files downloads

205