COMPARATIVE ASSESSMENT OF Al-Si ALLOY GASSING DEGREE WITH THE APPLICATION OF THE ‘FIRST BUBBLE’ AND ‘SOLIDIFICATION UNDER DECREASED PRESSURE’ METHODS

Authors

  • Jerzy Zych AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland
  • Marcin Piękoś AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland
  • Joanna Kolczyk AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

DOI:

https://doi.org/10.7494/mafe.2016.42.1.7

Keywords:

aluminum alloys, gassing degree, measuring the gas content

Abstract

All aluminum alloys in a liquid state are characterised by easy oxidation and absorption of hydrogen from the surroundings (which are the main reasons for casting defects). The amount of hydrogen adsorbed by a liquid alloy depends mainly on temperature and melting time. The performed investigations were aimed at comparing two known methods of measuring a metal gassing degree; the first bubble method and sample solidification under decreased pressure. Liquid metal melting and holding processes were performed under different conditions that caused variability of its gassing degree, resulting in a variability of purity and quality of the liquid metal. The investigations were carried out with using the hypoeutectic aluminum-silica AK7 alloy.

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References

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Published

2016-09-26

Issue

Vol. 42 No. 1 (2016)

Section

Articles

How to Cite

COMPARATIVE ASSESSMENT OF Al-Si ALLOY GASSING DEGREE WITH THE APPLICATION OF THE ‘FIRST BUBBLE’ AND ‘SOLIDIFICATION UNDER DECREASED PRESSURE’ METHODS. (2016). Metallurgy and Foundry Engineering, 42(1), 7. https://doi.org/10.7494/mafe.2016.42.1.7

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