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Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting

M. Matejka D. Bolibruchová R. Podprocká

Archives of Foundry Engineering | 2022 | vol. 22 | No 4 | 34-40 | DOI: 10.24425/afe.2022.140249

Keywords Al-Si-Cu alloy High-pressure die casting Porosity Brinell hardness Microstructure

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Abstract

High-pressure die casting results in a high quality surface and good mechanical properties of castings. Under the effect of pressure, integral and solid castings are achieved without a large number of foundry defects. The correct and proper setting of technological parameters plays a very important role in minimizing casting defects. The aim of the presented article is to determine the optimum maximum piston velocity for a casting in the high-pressure casting process with two height variants, depending on their internal quality. It is because the internal quality of particular castings is important in terms of proper functionality in operations where the biggest problem is the porosity of the casting. The main cause of porosity formation is the decreasing solubility of gases (most often hydrogen) during the melt solidification. Solubility represents the maximum amount of gas that can dissolve in a metal under equilibrium conditions of temperature and pressure. Macroporosity and microporosity were determined from the sections of the surfaces in the determined zones of the castings. Here, the results was that the macroporosity decreased with increasing piston velocity. Ideal microstructure was evaluated at a piston velocity of 3 m/s for both types of castings. On the other hand, the increase in tube size has shown that velocities of 3 m/s and higher, the tube is more prone to macroporosity formation. The highest hardness was achieved at the piston velocity of 2 m/s at both tube lengths.

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Authors and Affiliations

M. Matejka

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ORCID:

D. Bolibruchová

e-mail:

ORCID:

R. Podprocká

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Slovak Republic
Rosenberg-Slovakia s.r.o., Slovak Republic

Study of Susceptibility to Tearing of AlSi5Cu2Mg Alloy with Addition of Zr and Ti

M. Matejka D. Bolibruchová E. Kantoríková

Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 107-114 | DOI: 10.24425/afe.2024.149257

Keywords Al-Si-Cu-Mg alloy Hot tears Curve of load force Dendrite coherency point

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Abstract

The current trend of continuous improvement of various components constantly pushes the development of new materials forward. The basic goal of research into new and better materials is to improve their properties compared to the original material. One of the essential properties of the newly developed aluminum alloys is their resistance to the formation of tearing. Tears appear during the solidification of the casting and break the integrity due to tension arising while cooling. Several factors influence the susceptibility to tearing, but they can be minimized and reduce the chance of their occurrence. As part of the experiment, the AlSi5Cu2Mg alloy was evaluated in four material variants, without additives (in the reference state), with the addition of transition elements Zr, Ti and their combination Zr + Ti. Susceptibility to the formation of teras was assessed using a qualitative method supplemented by microscopic analysis of the tear profile and determination of the dendritic coherence temperature. The evaluation shows that the addition of Zr increased the susceptibility to tear formation. On the contrary, the addition of Ti had a positive effect and reduced the susceptibility to the formation of tears. The effect of the addition of Zr and Ti in the AlSi5Cu2Mg alloy showed a similar values as without the addition of alloys (reference condition). Microstructural analysis of the tear profile pointed to the negative influence of phases rich in Zr. The subsequent evaluation of the dendritic coherence temperature of individual AlSi5Cu2Mg alloys did not show a correlation with the results of a quantitative evaluation of susceptibility to tears.

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Bibliography

[1] Bolibruchová, D. (2010). Foundry technology. Žilina: vydavateľstvo GEORG, ISBN 978-80-89401-14-7.
[2] Pastirčák, R., Bolibruchová, D., Sládek, A. (2015). Foundry theory. Žilina: EDIS-vydavateľské centrum ŽU, ISBN 978-80-554-1096-8.
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[10] Djurdjevic, M.B. Sokolowski, J.H. & Odanovic Z. (2012). Determination of dendrite coherency point characteristics using first derivative curve versus temperature. Journal of Thermal Analysis and Calorimetry volume. 109(2), 875-882. https://doi.org/10.1007/s10973-012-2490-4.
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[12] Bolibruchová, D., Širanec, L. & Matejka, M. (2022). Selected properties of a Zr-containing AlSi5Cu2Mg alloy intended for cylinder head castings. Materials. 15(14), 4798, 1-16. https://doi.org/10.3390/ma15144798
[13] Bolibruchová, D., Kuriš, M., Matejka, M. & Kasińska, J. (2022). Study of the influence of zirconium, titanium and strontium on the properties and microstructure of AlSi7Mg0.3Cu0.5 alloy. Materials. 15(10), 3709, 1-20. https://doi.org/10.3390/ma15103709.

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Authors and Affiliations

M. Matejka

e-mail:

ORCID:

D. Bolibruchová

e-mail:

ORCID:

E. Kantoríková

e-mail:

ORCID:

University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Slovak Republic

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Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting

Abstract

Authors and Affiliations

Study of Susceptibility to Tearing of AlSi5Cu2Mg Alloy with Addition of Zr and Ti

Abstract

Bibliography

Authors and Affiliations