Abstract
This chapter presents the issue of the effect of technological parameters (impact on the cooling rate and the physicochemical state of liquid metal) on the microstructure and quality of the casting surface. A diagram of the impact of the technological factors on the parameters of the microstructure of cast iron SGI and CGI is presented. It is demonstrated that wall thickness of the casting and pouring temperature affect the initial temperature of the metal in the mold, which determines the thickness and the presence of flake graphite in the surface layer. Moreover, the issues is raised dealing with chemical composition, including despheroidising elements, metallurgical treatments, as well as changes in the cooling rate at the transition from conventional through thin up to the ultra-thin wall casting s in terms of shaping defects and the casting surface. In addition to this, molding sand is also considered in this chapter. Special attention is paid to the molding sands containing reclaimed resin-bonded sand with p-toluenosulfonic acid as a hardening catalyst. Finally, a comparison between the effects of different types of molding sands with using fresh and reclaimed materials, protection atmosphere and coatings is shown.
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Górny, M. (2015). Influence of the Technological Parameters on the Microstructure and Quality of the Casting Surface. 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_7
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DOI: https://doi.org/10.1007/978-3-319-14583-9_7
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