In the present paper, the initial nuclei of flake graphite in grey cast iron are investigated. Using liquid quench, deep electrolytic erosion, and electron microanalysis, it is shown that the initial graphite in grey cast iron is nodular and involves a heterogeneous nucleus which can be one of several types: complex oxides, MnS, sulphides of rare earth, etc. The elements Si, Ca, Mn, Ce, La, Al, etc. can promote heterogeneous nucleation of flake graphite in grey cast iron.
MST/709
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