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Solution of the Pure Metals Solidification Problem by Involving the Material Shrinkage and the Air-Gap Between Material and Mold

Matlak J., Słota D.

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 3 spec.

47--52

EN

In this paper we describe an algorithm for solving the pure metals solidification problem by involving the metal shrinkage and air-gap between material and mold. In this algorithm we use the finite element method supplemented by the procedures allowing to define the position of the moving interface and the change of the material size associated with the shrinkage. We present also an example illustrating the precision of presented method.

2

Increase of liquid metal utilization during production of bearing circle castings for cement furnaces

Zadera A., Senberger J., Carbol Z., Pluhaček J.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 2

111-116

EN

In manufacture of super heavy castings for cement furnaces a saving of liquid metal has been achieved by lowering the riser weight. By solidification modelling with the aid of the Niyama criterion a zone in the riser was designated where the occurrence of foundry defects (shrinkage porosity) can be expected. A plate of the material of dimensions ca 700*800*250 mm was taken from the riser. After thermal treatment the samples for making the bars for the static tensile test were taken from it. Based on done tests it has been found out that mechanical characteristics obtained from the static tensile test correlate, besides contraction, in the chosen level of statistical importance of p = 0.01 with carbon content. Neither in the zone of probable occurrence of defects designated by the Niyama criterion during solidification modelling the drop of strength characteristics was observed. Carbon content in a decisive extent influenced the strength characteristics. In case of ductility and contraction the convenient correlations with carbon content were observed from the riser height of 200 mm only. In the height of 400 mm there was already considerable variation of values and some values were lower ones than is demanded by standards.

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Krystalizacja i skurcz stopu AK9 (AISi9Mg)

Dudyk M., Kosibor K.

Archiwum Odlewnictwa

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2004

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R. 4, nr 14

138-145

PL

W artykule przedstawiono wpływ uszlachetniania (rafinacji, modyfikacji Sr lub Sb) siluminu AK9 (AISi9Mg) na zmiany kinetyki procesów krystalizacji, określanych na urządzeniu CRISTALDIMAT (ATD). Dla badanych siluminów przedstawiono oryginalne wyniki dotyczące skurczu w czasie krystalizacji oraz wyniki badań dylatometrycznych po zastosowanych zabiegach rafinacji i modyfikacji. Określono wpływ krystalizacji podstawowych faz (alfa i eutektyki alfa + Si) na zmiany wydłużenia badanych próbek. Na DYLATOMETRZE AUTOMATYCZNYM DA - 2 sporządzono dylatogramy i określono ich wpływ na skurcz w stanie stałym badanych siluminów.

EN

In the article introduced influence of enriching (refinement, modification Sr or Sb) aluminium alloy AK9 (AISi9Mg) on changes of kinetic crystallization proceses defined on device CRISTALDIMAT (ATD). For investigated alluminium alloy introduced oryginal results relating contraction during of crystallization and results dylatometric researches after used interventions of refinement and of modification. Qualified influence crystallization of basic phases (alfa and eutektic alfa + Si) on changes of extension investigated sampIes. On automatic dilatometer DA-2 prepared dilatogrames and defined their influence on contraction in solid state investigated aluminium alloys.