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Correlation Between K-value, Density Index and Bifilm Index in Determination of Liquid Al Cleanliness

Tigli Ahmed, Tokatli M., Uslu Emin, Colak M., Dispinar Derya

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 3

22--29

EN

Aluminum alloys are widely used in the industry thanks to its many advantages such as light weight and high strength. The use of this material in the market is increasing day by day with the developing technology. Due to the high energy inputs in the primary production, the use of secondary ingots by recycling from scrap material are more advantageous. However, the liquid metal quality is quite important in the use of secondary aluminum. It is believed that the quality of recycled aluminum is low, for this purpose, many liquid metal cleaning methods and test methods are used in the industry to assess the melt cleanliness level. In this study, it is aimed to examine the liquid metal quality in castings with varying temperature using K mold. A206 alloy was used, and the test parameters were selected as: (i) at 725 °C, 750 °C and 775 °C casting temperatures, (ii) different hydrogen levels. The hydrogen level was adjusted as low, medium and high with degassing, as_cast, and upgassing of the melt, respectively. The liquid metal quality of the cast samples was examined by the K mold technique. When the results were examined, it was determined that metal K values and the number of inclusions were high at the as-cast and up-gas liquid with increasing casting temperatures. It has been understood that the K mold technique is a practical method for the determination of liquid metal quality, if there is no reduced pressure test machine available at the foundry floor.

2

Influence of Melt Quality on the Formation of Fe Intermetallic in A360 Alloy

Bas E. N., Alper S., Tuncay Tansel, Dispinar Derya, Kirtay Sebahattin

Archives of Foundry Engineering

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2022

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Vol. 22, iss. 3

53--59

EN

The solubility of Fe in aluminium alloys is known to be a problem in the casting of aluminium alloys. Due to the formation of various intermetallic phases, the mechanical properties decrease. Therefore, it is important to determine the formation mechanisms of such intermetallic. In this work, A360 alloy was used, and Fe additions were made. The alloy was cast into the sand and die moulds that consisted of three different thicknesses. In this way, the effect of the cooling rate was investigated. The holding time was selected to be 5 hours and every hour, a sample was collected from the melt for microstructural analysis. Additionally, the melt quality change was also examined by means of using a reduced pressure test where the bifilm index was measured. It was found that the iron content was increased after 2 hours of holding and the melt quality was decreased. There was a correlation between the duration and bifilm index. The size of Al-Si-Mn-Fe phases was increased in parallel with the bifilm content regardless of the iron content.

3

Szacowanie kosztów zapewnienia jakości stopów z wykorzystaniem systemu "Arena"

Pisarek B.

Archiwum Odlewnictwa

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2006

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R. 6, nr 19

267-276

PL

W pracy przedstawiono wykorzystanie programu ARENA do symulacji procesu produkcyjnego, przykładowo wytapiania i odlewania staliwa, monitorowanego autorskim programem komputerowym pod względem zgodności z wymaganiami technologicznymi. Na podstawie danych z symulacji określono wartość odpowiednich składników kosztów jakości i kosztów międzywydziałowych związanych z usuwaniem niezgodności z technologią przygotowanego staliwa.

EN

It present use of ARENA for simulation of production system for example of melting and casting of cast steel, in respect of acceptability status monitored technological method of thermal and derivative analysis with author software. Value of component of costs of proper quality define of base from simulation data and with deletion of incompatibility with technology prepared interdepartment costs of cast steel.