Analysis of Nuclei in a Heavy-Section Nodular Iron Casting

Mayerling Martinez Celis (1) , Bernadette Domengès (1, 2, 3, 4) , Eric Hug (1) , Jacques Lacaze (5)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 Presto Engineering Europe
3 NXP Semiconductors [France]
4 LaMIPS - Laboratoire de Microélectronique et de Physique des Semiconducteurs
5 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

The microstructure of heavy section nodular graphite cast irons often presents a bimodal distribution of nodule size associated with so-called primary and secondary graphite nucleation. It has been found that the nuclei in both types of nodules consist mainly in magnesium sulphide. However, nuclei in primary nodules contain some traces of calcium and are thus related with the inoculation treatment. On the contrary, nuclei in secondary nodules do not contain any element that could be associated to inoculation. It is suggested they form in the late stage of the eutectic reaction as a result of microsegregation build-up in magnesium and sulphur.

Mots clés: Nodular cast iron; Heavy section casting; Nuclei

Domaines: Génie des procédés; Matériaux

Mayerling Martinez Celis, Bernadette Domengès, Eric Hug, Jacques Lacaze. Analysis of Nuclei in a Heavy-Section Nodular Iron Casting. Materials Science Forum, 2018, 925, pp.173-180. ⟨10.4028/www.scientific.net/MSF.925.173⟩. ⟨hal-01984770⟩