Role of Lanthanum in Graphite Nucleation in Grey Cast Iron

Abstract:

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Specific investigations concerning La-contributions in graphite nucleation process in Ca,Al,La-FeSi inoculated grey cast irons were performed by using a scanning electron microscopy (SEM, EDS). It was re-confirmed that complex (Mn,X)S compounds act as major nucleation sites for graphite flakes. La was mainly concentrated in the first formed oxide-based micro-inclusions (similarly to Al), but also at an important level in the shell of (Mn,X)S compounds (accompanying Ca). It is assumed that La forms micro-inclusions later than Al, as La-reached phase surrounded Al-reached phase. Complex Al-La small micro-inclusions, as possible better nucleation sites for (Mn,X)S compounds and La-Ca presence in the shell/body of these sulphides, possible better nucleation sites for flake graphite, appear to be the peculiar effects of ferrosilicon based inoculants, which include these active elements, promoting type-A graphite, inclusively in low S-grey iron.

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Periodical:

Edited by:

Adel Nofal and Mohamed Waly

Pages:

19-24

DOI:

10.4028/www.scientific.net/KEM.457.19

Citation:

I. Riposan et al., "Role of Lanthanum in Graphite Nucleation in Grey Cast Iron", Key Engineering Materials, Vol. 457, pp. 19-24, 2011

Online since:

December 2010

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$35.00

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