Effect of Filter Thickness on Reoxidation and Mechanical Properties of Aluminium Alloy AlSi7Mg0.3

• Autorzy: Bruna M. , Remišová A. , Sládek A.

Identyfikatory

DOI

10.24425/amm.2019.129500

• Języki publikacji: EN

Abstrakty

EN

The melt cleaning is an important aspect in the production of high-quality aluminum castings. Specifically inclusions within the melt and an excessively high hydrogen content lead to defects and undesired porosity in the castings. Although it is possible to reduce the amount of hydrogen and oxidic inclusions by purge gas treatment and the use of melting salts, it is impossible toremove oxides (bifilms) created during filling of gating system. Paper deals with the effects of melt quality and the placement of a filter in the filling system on Al-7%Si-Mg alloy mechanical properties. Three different filters were used: (a) rectangular ceramic pressed filter with 3 mm thickness (b) cubical pressed ceramic filter with thickness 10 mm (c) cubical pressed ceramic filter with thickness 22 mm. The results showed that the highest tensile strength values were obtained from the filter with thickness of 22 mm. Numerical simulation analysis of the filling process showed that velocity reduction by filter is the major phenomenon affecting the mechanical properties. Another evaluated aspect during experiments was capability of filters to retain old bifilms. For this purpose multiply remelted alloy was prepared and analyzed. Results showed that filter efficiency increases with decreasing melt quality as a result of possibility to retain "old” bifilms better than small and thin "new” bifilms.

Słowa kluczowe

EN

bifilm; numerical simulation; reoxidation; mechanical properties; filtration

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2019
• Tom: Vol. 64, iss. 3
• Strony: 1100--1106
• Opis fizyczny: Bibliogr. 8 poz., fot., rys., tab.

Twórcy

autor

Bruna M.

• University of Žilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia

autor

Remišová A.

• University of Žilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia

autor

Sládek A.

• University of Žilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia

Bibliografia

• [1] J. Campbell, Complete Casting Handbook: Metal Casting Processes, Metallurgy, Techniques and Design. 2011: Elsevier Butterworth-Heinemann (2011).
• [2] D. Dispinar, et al., Degassing, hydrogen and porosity phenomena in A356. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 527 (16-17), 3719-3725.2. (2010).
• [3] D. Dispinar, et al., Tensile properties, porosity and melt quality relation of A356. Tms 2012 141st Annual Meeting & Exhibition – Supplemental Proceedings, Materials Properties, Characterization, and Modeling 2, 201-208 (2012).
• [4] D. Dispinar, J. Campbell, Porosity, hydrogen and bifilm content in Al alloy castings. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 528 (10-11), 3860-3865 (2011).
• [5] E. Krivos, R. Pastircak, R. Madaj, Arch. Metall. Mater. 59, 3, 1069-1072 (2014), DOI: 10.2478/amm-2014-0182.
• [6] C. Nyahumwa, N. R. Green, J. Campbell, Effect of mold-filling turbulence on fatigue properties of cast aluminum alloys. AFS Trans 106, 215-223 (1998).
• [7] D. Medlen, D. Bolibruchová. Archives of Foundry Engineering 12 (1), 81-86 (2012).
• [8] E. Krivoš, R. Pastirčák, R. Madaj, Arch. Metall. Mater. 59, 3, 1069-1072 (2014), DOI: 10.2478/amm-2014-0182.

Uwagi

EN

1. This article was made under support projects APVV-17-0310. Project title: Implementation of the 4th Industrial Revolution Principles in the Production of Tyre Components and V-1/0706/18 Concept and realization of modern center of diagnostics and quality control for castings and weldments.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).