Abstract
Mechanical properties of the castings are directly affected negatively by the inclusions, such as its own oxide occurring during melting, if proper and logical liquid metal processes could not be carried out. To overcome this issue, different compositions and types of fluxes were practiced. Na2SiF6, NaF/AlF3 (cryolite ratio) = 1.85, 2.8, and 3, NaF, Na3AlF6 (commercial cryolite) added with different ratios to the mixture of NaCl+KCl, and also only Na2SiF6 to the mixture of MgCl2+KCl were appended to the liquid metal to remove inclusions, such as old oxide bifilms. Average effectiveness values of the fluxes concerning mechanical properties were investigated as well. The change in the melt cleanliness before and after degassing has been taken into account to establish a model that correlates bifilm index and tensile properties. Since bifilm index is directly interested in porosity shape and amount to quantify liquid metal quality, any other techniques, such as density index, were not be consulted. In addition, the main focus was based on how much the melt was cleaned rather than the cleanliness of the melt after degassing. Thus, the difference of bifilm index as a melt cleanliness indicator firstly was introduced to the literature. In addition to this, the contour plots of mechanical properties and bifilm index values were used to evaluate the correlation, and it was found that there was an exponential relationship, a quality index, between elongation at fracture, tensile strength, and bifilm index.
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Acknowledgements
The authors are thankful to Özge Tamer from Gazi University (formerly Yıldız Technical University), Ömer Demir, Hüseyincan Eker, Cemal Öztürk and Yusuf Basri Balcı from Yıldız Technical University, Özgür Topçuoğlu (formerly CMS Wheel), Uğur Aybarç, and Halil Emre Çubuklusu from CMS Wheel, and TÜBİTAK.
Funding
This work from my Ph.D thesis was supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK) [grant number 114M100] and Coordinators of Scientific Research Projects (BAPK) of Yıldız Technical University [Grant Number DOP - 2014-07-02-DOP03].
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D.D. and M.Ç. designed and directed the dissertation and the project; Ç.Y., D.D., and M.Ç. performed the experiments; Ç.Y., D.D., and M.Ç. contributed to the analysis of the results, and the writing of the manuscript.
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Yüksel, Ç., Dışpınar, D. & Çiğdem, M. An Analytical Approach for the Correlation Between Bifilm Index and Tensile Properties of AlSi7Mg0.3 (A356) Aluminum Alloy Cleaned via Rotary Degassing and Different Fluxes. Inter Metalcast 17, 1615–1627 (2023). https://doi.org/10.1007/s40962-022-00882-x
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DOI: https://doi.org/10.1007/s40962-022-00882-x