Abstract: Precipitation of graphite
during eutectic reaction in compacted / vermicular (CV) cast
iron is clarified by investigation on the solidification
process of cast iron treated with various vermicularizing
agents. It is found that the eutectic solidfication process
consists of two stages: in the first stage, spheroidal graphite
is formed and then encircled by austenite shell; in the second
stage, vermicular graphite is formed, and due to partial
remelting of the austemite shell, the vermicular graphite comes
into contact with liquid iron and grows. The investigation shows
that spheroidal graphite formed during the first stage of
eutectic solidification becomes the starting point of CV
graphite.
Key words:
Compacted/vermicular graphite Solidification process Compacted/Vermicular graphite cast iron
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