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The Mold/Casting Interface Phenomena

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Microstructure and Properties of Ductile Iron and Compacted Graphite Iron Castings

Part of the book series: SpringerBriefs in Materials ((BRIEFSMATERIALS))

Abstract

Many of surface defects in casting are caused by interaction of the metal with the molding sand. These phenomena occurring on the mold/cast interface can be divided into three groups: metal penetration (mechanical, chemical, vapor state, water explosion penetration and eutectic exudation penetration); transition of elements from the molding sand into casting and from the casting into the mold and gas generation by thermal decomposition of the binder and/or coating. Transition of the casting elements such as P, N, H, C, S, Si from the molding sand to the surface layer of the casting and elements such as Mn, C from casting to the molding sand is also possible. Frequently, this can cause changes in the chemical composition of the surface layer of the casting, which may consequently lead to changes in the casting microstructure and properties. Gases emitted from the molding sand, core or protective coating during pouring liquid metal are often due to the cause of the so-called gas porosity. The rate of the evolution of gases from the mold and cores, and their volume depends strongly on the binder used. Air present in the mold cavity may also be the cause of porosity.

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Notes

  1. 1.

    Iron in solid or liquid state does not react directly with the oxide material of the mold. Iron must be present in ionic form (salt or oxide) [25].

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  1. AGH University of Science and Technology, Kraków, Poland

    Mariusz Holtzer

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Holtzer, M. (2015). The Mold/Casting Interface Phenomena. In: Microstructure and Properties of Ductile Iron and Compacted Graphite Iron Castings. SpringerBriefs in Materials. Springer, Cham. https://doi.org/10.1007/978-3-319-14583-9_5

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