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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modelling of eutectic saturation influence on microstructure in thin wall ductile iron casting using cellular automata
    Autorzy:
    Burbelko, A. A.
    Gurgul, D.
    Kapturkiewicz, W.
    Górny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380375.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proces krzepnięcia
    automat komórkowy
    modelowanie
    solidification process
    thin cellular automaton
    modeling
    Opis:
    The mathematical model of the globular eutectic solidification in 2D was designed. Proposed model is based on the Cellular Automaton Finite Differences (CA-FD) calculation method. Model has been used for studies of the primary austenite and of globular eutectic grains growth during the ductile iron solidification in the thin wall casting. Model takes into account, among other things, non-uniform temperature distribution in the casting wall cross-section, kinetics of the austenite and graphite grains nucleation, and non-equilibrium nature of the interphase boundary migration. Calculation of eutectic saturation influence (Sc = 0.9 - 1.1) on microstructure (austenite and graphite fraction, density of austenite and graphite grains) and temperature curves in 2 mm wall ductile iron casting has been done.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 11-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellular automaton modeling of ductile iron density changes at the solidification time
    Autorzy:
    Burbelko, A. A.
    Gurgul, D.
    Królikowski, M.
    Wróbel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379685.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cellular automation
    ductile iron
    pre-eutectic shrinkage
    eutectic expansion
    automat komórkowy
    żeliwo sferoidalne
    skurcz eutektyczny
    Opis:
    Formation of the shrinkage defects in ductile iron castings is far more complicated phenomenon than in other casting alloys. In the paper one of the aspects of formation of porosity in this alloy was considered – changes in cast iron's density during crystallization caused by varying temperature, phase fractions and phase's composition. Computer model, using cellular automata method, for determination of changes in density of ductile iron during crystallization was applied. Simulation of solidification was conducted for 5 Fe-C binarie alloys with ES from 0.9 to 1.1 for the estimation of the eutectic saturation influence on the ductile iron shrinkage and expansion. As a result of calculations it was stated that after undercooling ductile iron below liquidus temperature volumetric changes proceed in three stages: preeutectic shrinkage (minimal in eutectic cast iron), eutectic expansion (maximum value equals to about 1.5% for ES = 1.05) and last shrinkage (about 0.4% in all alloys regardless of ES).
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 9-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Dendritic Structure Evolution During Solidification of Al-Cu Alloy
    Autorzy:
    Zyska, A.
    Boroń, K.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382278.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy solidification
    cellular automata
    AlCu alloy
    structure modeling
    krzepnięcie stopu
    automat komórkowy
    stop AlCu
    modelowanie struktury
    Opis:
    The paper presents the cellular automaton (CA) model for tracking the development of dendritic structure in non-equilibrium solidification conditions of binary alloy. Thermal, diffusion and surface phenomena have been included in the mathematical description of solidification. The methodology for calculating growth velocity of the liquid-solid interface based on solute balance, considering the distribution of the alloy component in the neighborhood of moving interface has been proposed. The influence of solidification front curvature on the equilibrium temperature was determined by applying the Gibbs Thomson approach. Solute and heat transfer equations were solved using the finite difference method assuming periodic boundary conditions and Newton cooling boundary condition at the edges of the system. The solutal field in the calculation domain was obtained separately for solid and liquid phase. Numerical simulations were carried out for the Al-4 wt.% Cu alloy at two cooling rates 15 K/s and 50 K/s. Microstructure images generated on the basis of calculations were compared with actual structures of castings. It was found that the results of the calculations are agreement in qualitative terms with the results of experimental research. The developed model can reproduce many morphological features of the dendritic structure and in particular: generating dendritic front and primary arms, creating, extension and coarsening of secondary branches, interface inhibition, branch fusion, considering the coupled motion and growth interaction of crystals.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 87-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of two-stage solidification: Part II computational verification of the model
    Autorzy:
    Wodo, O.
    Gawrońska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380341.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cellular automata
    solidification
    microstructure modeling
    dendritic structure
    eutectic structure
    automat komórkowy
    krzepnięcie
    modelowanie mikrostrukturalne
    struktura eutektyczna
    Opis:
    In Part I of this article, two-stage solidification model was presented. In this part we use our model to simulate solidification of the Al 7% Si alloy for two cooling rates - 2 deg/s and - 20 deg/s. Simulations have been performed for two eutectic transformation modes, typical for modified and unmodified alloys. Obtained cooling curves are qualitatively consistent with the typical cooling curves for modified and unmodified alloys. Moreover, evolution of cooling-curve characteristics is compared with the analytical model and found to be in close agreement.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of two-stage solidification: Part I model development
    Autorzy:
    Wodo, O.
    Gawrońska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380434.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    automat komórkowy
    krzepnięcie
    modelowanie mikrostrukturalne
    struktura eutektyczna
    cellular automata
    solidification
    microstructure modeling
    dendritic structure
    eutectic structure
    Opis:
    The paper presents a new numerical model of solidification processes in hypoeutectic alloys. The model combines stochastic elements, such as e.g. random nucleation sites and orientation of dendritic grains, as well as deterministic methods e.g. to compute velocity of dendritic tips and eutectic grains. The model can be used to determine the temperature and the size of structure constituents (of both, the primary solid phase and eutectics) and the arrangement of individual dendritic and eutectic grains in the consecutive stages of solidification. Two eutectic transformation modes, typical to modified and unmodified hypoeutectic alloys, have been included in the model. To achieve this, cellular automata and Voronoi diagrams have been utilized.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 151-156
    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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