A series of experiments was conducted using two cast irons of similar analysis to study the effect of the graphite morphol ogy on the matrix structure of cast irons. One iron was an inoculated gray iron, the other a RE silicide-treated and inoculated compacted graphite cast iron containing some spheroids. These irons were cast into conventional eutec tometer samples and then quenched during cooling after solidification, held isothermally, or control cooled to a given temperature before being quenched in the austenite region or during eutectoid formation. Microstructures were evaluated and comparisons were made between the two irons. It was demonstrated that the graphite morphology plays a significant role in determining the matrix structure . Ferrite development is strongly favored by the exposed basal planes on the surface of spheroidal graphite and by crystal defects which may be present, or caused to form, during heat treat ment of flake graphite. In general, flake graphite irons de monstrated substantial resistance to the formation of ferrite. This was attributed to the lack of sites on the flake graphite for carbon accumulation.
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