Conclusions
In order that a lamellar graphite eutectoid be formed it is necessary:
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1.
That the cast iron solidify according to the metastable system and that at the moment of reaching the eutectoid range, the structure be free of primary or eutectic graphite.
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2.
That the silicon content in the iron be high (3.5%–4.5%).
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3.
That the cooling rate be moderate (ordinary dry sand molds).
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