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

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 b...

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Bibliographic Details
Published in:Archives of foundry engineering 2023-01, Vol.23 (3), p.22-29
Main Authors: Tigli, A, Tokatli, M, Uslu, E, Colak, M, Dispinar, D
Format: Article
Language:English
Subjects:
a206 aluminum casting
Aluminum
Aluminum base alloys
Casting
Castings
Cleanliness
Degassing
Hydrogen
Inclusions
Ingot casting
k mold
liquid metal cleaning
Liquid metals
Metal scrap
Molds
Recycled materials
rpt
secondary aluminum
Weight reduction
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Summary: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.
ISSN:1897-3310
2299-2944
DOI:10.24425/afe.2023.144311