Graphite Growth Morphologies in Cast Iron

Author:

Muhmond Haji Muhammad1,Fredriksson Hasse1

Affiliation:

1. KTH

Abstract

Graphite growth morphology was studied by using InLense detector on FEG-SEM after performing ion etching on the samples. Star like and circumferential growth mechanism of graphite was observed in the graphite nodules. Pure ternary alloy of hypo eutectic and hyper eutectic composition was treated with pure Mg, Ca and Sr, to study the effect of O and S concentration in the melt, on the transition of graphite morphology from nodular to vermicular/compacted and flake graphite. The change in the melt composition between the austenite dendrites due to micro-segregation of S, O and inoculants and their possible effects on the transition of graphite morphologies as well as the nucleation of new oxides/sulfides particles is discussed with the help of thermodynamics.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference16 articles.

1. Y. Igarashi, S. Okada, Observation and analysis of the nucleus of spheroidal graphite in magnesium-treated ductile iron, Int. J. Cast Metals res., 1998. Vol. 11, pp.83-88.

2. Y. Igarashi, S. Okada, Nucleus of various shapes of graphite in Ca, RE and Mg-Ti treated irons, J. Jap. Foundry Eng. Society, 1999, vol. 71, pp.745-751.

3. H. nakae, Y. Igarashi, Y. Ono, Heterogeneous nucleus of spheroidal graphite and mechanism of spheroidal graphite formation, J. Jap. Foundry Eng. Society, 2001, vol. 73, pp.111-11.

4. H. M. Muhmond and H. Fredriksson, Relationship between inoculants and the morphologies of MnS and graphite in gray cast iron, Metall Mater Trans B, 2013, vol. 44, n. 2, pp.283-298.

5. J.P. Sadocha, J.E. Gruzleski, in: B. Lux, I. Minkoff, F. Mollard (Eds. ), The Metallurgy of Cast Iron, Georgi Publjishing Co., St. Saphorin, Switzerland, 1974, p.443.

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