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    Wyświetlanie 1-4 z 4
    Tytuł:
    Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy
    Autorzy:
    Çolak, M.
    Dışpınar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/379886.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A357 alloy
    grain refinement
    alloy modification
    Taguchi approach
    stop A357
    rafinowanie ziarna
    modyfikacja stopu
    metoda Taguchi
    Opis:
    Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner’s additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi’s experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 35-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837851.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837813.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effect of Solidification Time and Addition Amount of Inoculation on Microstructure and Hardness in Lamellar Graphite Cast Iron
    Autorzy:
    Çolak, Murat
    Uslu, Emin
    Teke, Çağatay
    Şafak, F.
    Erol, Ő.
    Erol, Y.
    Çoban, Y.
    Yavuz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lamellar graphite
    graphite cast iron
    inoculation
    solidification time
    modeling
    grafit
    żeliwo
    wszczepienia
    czas krzepnięcia
    modelowanie
    Opis:
    Material suppliers typically recommend different additive amounts and applications for foundry practices. Therefore, even in the production of the same standard materials, different results may be obtained from various production processes on different foundry floors. In this study, the liquid metal prepared with the addition of different proportions of a FeSi-based inoculation, which is most commonly used in foundries in the production of a cast iron material with EN-GJL-250 lamellar graphite cast iron, was cast into sand molds prepared with a model designed to provide different solidification times. In this way, the optimization of the inoculation amounts on the casting structure for different solidification times was investigated. In addition, hardness values were determined depending on solidification time in varying amounts of inoculation additions. SolidCast casting simulation software was used to determine the casting model geometry and solidification time. In the scope of the study, sand casting, modeling, microstructure analysis, image analysis, microstructure analysis, and hardness tests techniques were used. When the results are examined, the required amount of inoculation for the optimal structure is optimized for the application procedure depending on the casting module and the solidification time.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 24--33
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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