期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2019
卷号：2240
页码：494-499
出版社：Newswood and International Association of Engineers
摘要：This study present the effect of cooling rate of basic
foundry moulds on the microstructure and mechanical
properties of graphitic cast iron. Commercial grey iron has the
highest volume tonnage output beside steel in the foundry
industries worldwide. Hence, its rate of production depends
largely on its moulding time. As a result of this, moulds
selection is essential in its production and property. Silica and
Ferro chrome (Fe-Cr) industrial slag are 2 common mould
materials used in foundry for casting especially grey iron using
Sodium-Silicate-Carbondioxide process. Three moulds were
produced, one from each of these moulding materials and the
third from percentage mixture of the two moulding materials.
Cast samples were obtained using scraps of commercial grey
cast iron BS1452 GRADE 250. It was melted and cast using the
3 moulds. Analysis shows that Fe-Cr slag mould exhibited
highest cooling rates followed by mixed materials mould and
lastly the silica mould. The structural analysis of the as-cast
samples from each moulds type reveals the Fe-Cr slag mould
cast has the finest uniformly distributed graphite flakes with
average string lengths of 63.12, 38.62, and 26.18 μm and
corresponding observed toughness of 84-89 HRC, 74-78 HRC,
72-74 HRC for the slag mould cast sample, slag-sand mixed
mould cast sample and silica mould cast sample respectively.
Consequently, there is relative increase in the samples
hardness values with increasing cooling rate.
