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Evaluating the effectiveness of heat-resistant cast steel filtration from the results of structure examinations

Asłanowicz M., Ościłowiski A., Stochańczyk J., Wieliczko P.

Archives of Foundry Engineering

2007

Vol. 7, iss. 1

97-102

Filtration guarantees castings characterised by high quality and free from any non-metallic inclusions, which are formed at the stage of melting and pouring of liquid metal. This article discusses the problem of the effectiveness of filtration process taking as an example heat-resistant cast steel poured into ceramic moulds. In investigations, foamed zircon filters made by FerroTerm Sp. z o.o. Łódź, Poland, were used. The effectiveness of filtration was described and examined using the results of metallographic examinations, including macro- and micro-structure examinations of metal and of cast metal/ceramic filter interface, and measurements of the content of non-metallic inclusions. The methods of investigations were presented, the obtained results were described, and relevant conclusions were drawn, all of them unmistakably indicating a very beneficial effect that filtration has on molten metal quality.