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    Wyświetlanie 1-5 z 5
    Tytuł:
    Prediction of mechanical properties of cast A356 alloy as a function of microstructure and cooling rate
    Przewidywanie właściwości mechanicznych odlewniczych stopów aluminium A356 na podstawie mikrostruktury i szybkości chłodzenia
    Autorzy:
    Shabani, M. O.
    Mazahery, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351439.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A356
    właściwości mechaniczne
    przewidywanie
    mechanical
    dendrite arm spacing
    prediction
    Opis:
    In order to predict the mechanical properties of A356, a relatively new approach is presented in this paper using finite element technique which combines mechanical properties data in the form of experimental and simulated microstructures. In this work, the comparison of this model's predictions with the ones in the literature is presented. It is revealed that predictions of this study are consistent with the other works and experimental measurements for A356 alloy. The results of this research were also used in order to form an analytical equations followed with solidification codes for SUT (Sharif University Technology) software.
    W celu prognozowania właściwości mechanicznych stopów A356, w pracy przedstawiono stosunkowo nowe podejście przy użyciu metody elementów skończonych, które łączy w sobie dane właściwości mechanicznych w formie badań eksperymentalnych i symulacji mikrostruktur. W pracy przedstawiono porównanie przewidywań tego modelu z danymi literaturowymi i stwierdzono, że są one zgodne z innymi pracami i danymi eksperymentalnymi dla stopu A356. Wyniki tej pracy zostały również wykorzystywane do sformułowania równań analitycznych następnie użytych do programowania krzepnięcia w oprogramowaniu SUT (Sharif University of Technology).
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 3; 671-675
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of major alloying elements on the size of the secondary dendrite arm spacing in the as-cast Al-Si-Cu alloys
    Autorzy:
    Djurdjevič, M. B.
    Grzinčič, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382396.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stop AlSiCu
    odlewanie aluminium
    krzepnięcie
    secondary dendrite arm spacing
    AlSiCu alloy
    aluminium casting
    solidification
    Opis:
    A comprehensive understanding of melt quality is of paramount importance for the control and prediction of actual casting characteristics. Among many phenomenons that occur during the solidification of castings, there are four that control structure and consequently mechanical properties: chemical composition, liquid metal treatment, cooling rate and temperature gradient. The cooling rate and alloy composition are among them most important. This paper investigates the effect of some major alloying elements (silicon and copper) of Al-Si-Cu alloys on the size of the secondary dendrite arm spacing. It has been shown that both alloying elements have reasonable influence on the refinement of this solidification parameter.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Titanium Addition on the Pro-Eutectic and Eutectic Phases of AlSi9 Cast Alloy
    Autorzy:
    Ait El Haj, Badiâ
    Bouayad, Aboubakr
    Alami, Mohammed
    Powiązania:
    https://bibliotekanauki.pl/articles/353725.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AlSi9 cast alloy
    grain refinement
    thermal analysis
    eutectic phase
    Secondary Dendrite Arm Spacing
    SDAS
    Opis:
    In this study, the effects of grain size refiner addition and various pre-heating mold temperatures on AlSi9 cast alloy microstructure and solidification have been evaluated. For different process conditions, thermal analysis was performed for all samples and cooling curves were established. Important parameters in liquidus and eutectic Si-phase regions have been calculated usingthe first derivative cooling curves. Secondary Dendrite Arm Spacing (SDAS) variation was also determined. Experimental results question the effectiveness of cooling curve parameters in providing the microstructure data as a function of refinement. The present work shows that the effect of grain refiner addition on the value of SDAS was higher when the solidification time was lower. It indicated that the solidification parameters such as nucleation temperatures of α-Al phase, undercooling temperature and total solidification time were affected by grain refinement. It has been found that the addition of grain refiner affect the eutectic phase formation time. However, it has no effect on the eutectic phase morphology.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 385-391
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Secondary Dendrite Arm Spacing in Squeeze Casting Using Fuzzy Logic Based Approaches
    Autorzy:
    Patel, M. G. C.
    Krishna, P.
    Parappagoudar, M. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380567.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    squeeze casting process
    secondary dendrite arm spacing
    fuzzy logic
    adaptive network based fuzzy
    interface system
    prasowanie stopu
    odległość ramion dendrytów
    logika rozmyta
    system interfejsowy
    Opis:
    The quality of the squeeze castings is significantly affected by secondary dendrite arm spacing, which is influenced by squeeze cast input parameters. The relationships of secondary dendrite arm spacing with the input parameters, namely time delay, pressure duration, squeeze pressure, pouring and die temperatures are complex in nature. The present research work focuses on the development of input-output relationships using fuzzy logic approach. In fuzzy logic approach, squeeze cast process variables are expressed as a function of input parameters and secondary dendrite arm spacing is expressed as an output parameter. It is important to note that two fuzzy logic based approaches have been developed for the said problem. The first approach deals with the manually constructed mamdani based fuzzy system and the second approach deals with automatic evolution of the Takagi and Sugeno’s fuzzy system. It is important to note that the performance of the developed models is tested for both linear and non-linear type membership functions. In addition the developed models were compared with the ten test cases which are different from those of training data. The developed fuzzy systems eliminates the need of a number of trials in selection of most influential squeeze cast process parameters. This will reduce time and cost of trial experimentations. The results showed that, all the developed models can be effectively used for making prediction. Further, the present research work will help foundrymen to select parameters in squeeze casting to obtain the desired quality casting without much of time and resource consuming.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 51-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellular Automaton Finite Element Method Applied for Microstructure Prediction of Aluminium Casting Treated by Laser Beam
    Autorzy:
    Hajkowski, J.
    Popielarski, P.
    Ignaszak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/382992.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure alloys prediction
    aluminium alloys
    remelting by laser beam
    tribology
    finite element method applied
    cellular automaton
    dendrite arm spacing
    prognoza mikrostruktury stopów
    stopy aluminium
    przetapianie wiązką laserową
    trybologia
    zastosowanie metody elementów skończonych
    Opis:
    What is the limit of improvement the structure obtained directly from the liquid state, with possible heat treatment (supersaturation and aging)? This question was posed by casting engineers who put arbitrary requirements on reducing the DAS (Dendrite Arm Spacing) length to less than a dozen microns. The results of tests related to modification of the surface microstructure of AlSi7Mg alloy casting treated by laser beam and the rapid remelting and solidification of the superficial casting zone, were presented in the paper. The local properties of the surface treated with a laser beam concerns only a thickness ranging from a fraction to a single mm. These local properties should be considered in the aspect of application on surfaces of non-machined castings. Then the excellent surface layer properties can be used. The tests were carried out on the surface of the casting, the surface layer obtained in contact with the metal mould, after the initial machining (several mm), was treated by the laser beam. It turned out that the refinement of the microstructure measured with the DAS value is not available in a different way, i.e. directly by casting. The experimental-simulation validation using the Calcosoft CAFE (Cellular Automaton Finite Element) code was applied.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 111-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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