文章基本信息

标题：Evaluation of Structure - Properties Interdependence of Commercial Grey Iron in Silica & Slag Moulds
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作者：O.R. Oloyede ; S.A. Afolalu ; O.J. Adelakun 等
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.
关键词：Grey iron; Moulding sand; Fe-Cr Slag;SEM