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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Pressure on the Crystallisation of AlSi7Mg Alloy
    Autorzy:
    Pastirčák, R.
    Ščury, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355560.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    squeeze casting
    heat transfer coefficient
    heat flux
    Al alloys
    mechanical properties
    Opis:
    This paper deals with influencing the crystallisation of Al alloys by a direct squeeze casting method. The effects of changed cooling rates of the casting is evaluated using a heat transfer coefficient at different casting conditions. The experimental results obtained by temperature measurement of the casting and the mould were used to predict the casting and mould surface temperatures using regression curves. The measured temperatures in the sub-surface layers were used to determine the amount of heat transferred from the casting to the mould. The amount of transferred heat increased 20-fold due to the effect of pressure. We also evaluated the effect of the acting pressure on the mechanical properties and microstructure of the alloy used. The process parameters were varied in the experiment.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2193-2198
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Pressure During the Crystallization on Properties of the AlSi12 Alloy
    Autorzy:
    Pastirčák, R.
    Ščury, J.
    Moravec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380626.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    squeeze casting
    pressure
    aluminium alloy
    mechanical properties
    microstructure
    metoda prasowania stopu
    nacisk
    stop aluminium
    właściwości mechaniczne
    mikrostruktura
    Opis:
    The paper deals with the impact of technological parameters on the mechanical properties and microstructure in AlSi12 alloy using squeeze casting technology. The casting with crystallization under pressure was used, specifically direct squeeze casting method. The goal was to affect crystallization by pressure with a value 100 and 150 MPa. From the experiments we can conclude that operating pressure of 100 MPa is sufficient to influence the structural characteristics of the alloy AlSi12. The change in cooling rate influences the morphology of the silicon particles and intermetallic phases. A change of excluded needles to a rod-shaped geometries with significantly shorter length occurs when used gravity casting method. At a pressure of 100 MPa was increased of tensile strength on average of 20%. At a pressure of 150 MPa was increased of tensile strength on average of 30%. During the experiment it was also observed, that increasing difference between the casting temperature and the mold temperature leads to increase of mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Casting Wall Thickness on Crystallisation Under Pressure
    Autorzy:
    Pastirčák, R.
    Ščury, J.
    Brůna, M.
    Bolibruchová, D.
    Jakubski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353947.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    squeeze casting
    AlSi7Mg0.3 alloy
    AlSi12 alloy
    pressure
    wall thickness
    Opis:
    The paper deals with squeeze casting technology. For this research a direct squeeze casting method has been chosen. The influence of process parameters variation (casting temperature, mold temperature, pressure) on mechanical properties and structure will be observed. The thicknesses of the individual walls were selected based on the use of preferred numbers and series of preferred numbers (STN ISO 17) with the sequence of 3.15, 4.00, 5.00, 6.00 and 8.00 mm. The width of each wall was 22 mm with a length of 100 mm. As an experimental material was chosen the AlSi12 and AlSi7Mg0.3 alloys. The mechanical properties (UTS, E) for individual casting parameters and their individual areas of different thicknesses were evaluated. In the structure the influence of pressure on the change of the eutectic morphology, the change of the volume of eutectic and the primary alpha phase, the effect of the pressure on the more fine-grain and the regularization of the structure were evaluated.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1889-1893
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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