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Effect of Wall Thickness on the Microstructure of Ductile Iron Castings Manufactured by the Inmold Process Using a Reaction Chamber

Kamińska J., Angrecki M., Stefański Z., Palma A.

Archives of Foundry Engineering

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2018

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Vol. 18, iss. 4

50--54

EN

In the family of iron-based alloys, ductile iron enjoys the highest rate of development, finding application in various industries. Ductile iron or the cast iron with spheroidal graphite can be manufactured by various methods. One of them is the Inmold spheroidization process characterized by different technological solutions, developed mainly to increase the process efficiency. So far, however, none of the solutions has been based on the use of a reactor made outside the casting mould cavity. The method of spheroidization inside the casting mould using a reaction chamber developed at the Foundry Research Institute is an innovative way of cast iron treatment. The innovative character of this method consists in the use of properly designed and manufactured reactor placed in the casting mould cavity. Owing to this solution, the Inmold process can be carried out in moulds with both horizontal and vertical parting plane. The study presents the results of examinations of the microstructure of graphite precipitates and metal matrix of castings after spheroidization carried out by the Inmold process using a reactor and mould with vertical parting plane. Special pattern assembly was made for the tests to reproduce plates with wall thicknesses of 3; 5; 7; 10; 20 and 30 mm. The content of residual magnesium was determined for all tested castings, while for castings of plates with a wall thickness equal to or larger than 10 mm, testing of mechanical properties was additionally performed.

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Wpływ temperatury ciekłego metalu na efektywność sferoidyzacji przeprowadzonej metodą inmould z zastosowaniem komory reakcyjnej

Stefański Z., Kamińska J., Pamuła E., Angrecki M., Palma A.

Przegląd Odlewnictwa

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2017

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Vol. 67, nr 7-8

286--288

PL

W pracy przedstawiono wpływ temperatury zalewania (w zakresie od 1420°C do 1330°C, co 30°C) na efekt procesu sferoidyzacji przeprowadzonego metodą inmould, z zastosowaniem komory reakcyjnej. Metoda sferoidyzacji w formie, przy użyciu komory reakcyjnej, jest innowacyjną metodą sferoidyzacji opracowaną w Instytucie Odlewnictwa. Procesy sferoidyzacji i modyfikacji zachodzą jednocześnie podczas wypełnienia wnęki ciekłym metalem. Wyniki przeprowadzonych badań zaprezentowano w postaci mikrostruktur wydzieleń grafitu oraz osnowy metalowej. Podano zmiany składów chemicznych żeliwa po procesie sferoidyzacji, w zależności od zastosowanych temperatur zalewania.

EN

The influence of the pouring temperature (within a range: from 1420°C to 1330°C, every 30°C) on the spheroidisation process, performed by the inmould method with the reaction chamber application, is presented in the paper. The inmould spheroidisation method, performed with the application of the reaction chamber, is the innovatory method developed in the Foundry Research Institute.The spheroidisation and modification processes occur simultaneously during the mould cavity filling with liquid metal. The results of the performed investigations are presented in the form of graphite precipitations and metal matrix microstructures. The changes, after the spheroidisation process, of the cast iron chemical compositions in dependence of the applied pouring temperatures, are given.

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Ductile cast iron obtain by lost foam process and inmold method

Kaczorowski R., Just P., Pacyniak T.

Archives of Metallurgy and Materials

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2013

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Vol. 58, iss. 3

823--826

EN

This paper presents a technology of ductile cast iron obtain by lost foam process with use of inmold method. Spheroidization was carried out using master alloy in an amount of 1.5% by mass on casting iron. Research the influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidization cast iron, which estimated based on the shape of the graphite. Research have shown that the greatest impact on the degree of spheroidization has cast the infusion position relative to the casting inlet and the reaction chamber, and the shape of the reaction chamber.

PL

W pracy przedstawiono technologię otrzymywania odlewów z żeliwa sferoidalnego metodą inmold z wykorzystaniem procesu pełnej formy. Sferoidyzację prowadzono z użyciem zaprawy sferoidyzująco-modyfikującej w ilości 1,5% na masę sferoidyzowanego żeliwa. Przeprowadzono badania wpływu konfiguracji układu wlewowego oraz kształtu komory reakcyjnej na stopień sferoidyzacji żeliwa, który określono na podstawie wskaźnika kształtu grafitu. Badania wykazały, że największy wpływ na stopień sferoidyzacji żeliwa ma położenie wlewu doprowadzającego względem odlewu i komory reakcyjnej, oraz kształt komory reakcyjnej.

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The influence of the shape of the reaction chamber on spheroidisation of cast iron produced in the lost foam casting process with use of the inmold method

Just P., Pacyniak T.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 2

175-178

EN

The article presents the results of the research on the influence of the shape of reaction chamber on spheroidisation of cast iron produced with use of the inmold method. The amounts of nodular graphite precipitates in castings produced with the use of different reaction chambers have been compared.

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Influence of reaction chamber shape on cast-iron spheroidization process in-mold

Pietrowski S.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1

115-122

EN

This paper presents a results concerning the influence of reaction chamber shape on cast - iron spheroidization process in form. The volume of the tested reaction chambers was about 118000mm3. Reaction chambers in the shape of: rectangular, cylinder and spherical cap were examined. It has been shown that the best graphite spheroidizing process was provided by spherical cap chamber shape. The reaction of cast – iron with magnesium in reaction chamber depends on the flow of cast - iron in the chamber. In rectangular and cylinder shape chambers proceed the impact of diphase stream on flat bottom wall. It causes the creation on its surface film, called: cast – iron "film", where single grains of magnesium master alloy exist. The largest part of master alloy is drifted by liquid cast – iron to the top and only there graphite spheroidization process proceed. In the spherical cap shape reaction chamber, as a result of rotation movement of liquid cast – iron throughout its volume, graphite spheroidization process proceed. Apart from the reaction chamber shape, applying of mixing chamber ensure full cast - iron spheroidization process.

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Gating system for in-mold technology

Pokusová M., Murgaš M.

Archiwum Odlewnictwa

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2006

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R. 6, nr 18/2

21--26

EN

The reaction chamber’s shape is designed so to provide the homogeneous supply of the active elements from the master alloy at the different position of the casting towards the parting plane depending on the master alloy’s melting speed, its granulometry and the melt’s temperature. On the section including sprue–reaction chamber–slag skimmer the gating system is designed as the pressurized one with the control cross-section on the slag skimmer output.

PL

Kształt komory reakcji technologii In-mold dla żeliwa sferoidalnego jest zaprojektowany tak aby zabezpieczyć jednorodną podaż aktywnych elementów stopowych w różnych położeniach odlewu do płaszczyzny podziału zależnie od prędkości topnienia stopu, jego ziarnistości i temperatury topnienia.