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Wyszukujesz frazę "nodular graphite" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Segregation of Admixing Elements in the Boundary Layer of the Main Inlet of a Ductile Iron Casting
    Autorzy:
    Borowiecki, B.
    Mak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/382659.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile iron
    nodular graphite
    boundary layer
    żeliwo sferoidalne
    grafit sferoidalny
    warstwa przyścienna
    Opis:
    The object of the present paper is to determine the distribution of admixing elements, such as magnesium, manganese, silicon and sulfur, in the boundary layer of the main inlet of a ductile iron casting. The authors also intend to demonstrate the influence of elements diffusing from the casting mold, such as oxygen and silica, on the chemical composition of the boundary layer of the casting.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 10-17
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of averaged Voronoi polyhedron in the modelling of crystallisation of eutectic nodular graphite cast iron
    Autorzy:
    Burbelko, A. A.
    Początek, J.
    Królikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381559.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    nodular graphite
    modelling
    averaged Voronoi polyhedron
    żeliwo
    grafit kulkowy
    modelowanie
    wielościan Voronoia
    Opis:
    The study presents a mathematical model of the crystallisation of nodular graphite cast iron. The proposed model is based on micro- and macromodels, in which heat flow is analysed at the macro level, while micro level is used for modelling of the diffusion of elements. The use of elementary diffusion field in the shape of an averaged Voronoi polyhedron [AVP] was proposed. To determine the geometry of the averaged Voronoi polyhedron, Kolmogorov statistical theory of crystallisation was applied. The principles of a differential mathematical formulation of this problem were discussed. Application of AVP geometry allows taking into account the reduced volume fraction of the peripheral areas of equiaxial grains by random contacts between adjacent grains. As a result of the simulation, the cooling curves were plotted, and the movement of "graphite-austenite" and "austenite-liquid” phase boundaries was examined. Data on the microsegregation of carbon in the cross-section of an austenite layer in eutectic grains were obtained. Calculations were performed for different particle densities and different wall thicknesses. The calculation results were compared with experimental data.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 134-140
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparison of Selected Methods of Graphitizing Inoculation Applied after the Spheroidizing Treatment
    Autorzy:
    Gunia, P.
    Soiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381150.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    cast iron structure
    spheroidization
    nodular graphite
    graphitizing inoculation
    metalografia
    struktura żeliwa
    sferoidyzacja
    grafit sferoidalny
    Opis:
    The work compares the effectiveness of selected methods of graphitizing inoculation applied after the spheroidization in the slender tundish ladle of 1 Mg capacity. The inoculation was carried out according to the three various options. The first one was performed simply by means of the block of inoculant inserted in the gating system of the mould, the second one started with initial inoculation by the in-stream method during the transfer of metal from the slender ladle to the pouring ladle and was completed with the secondary modification by means of the inoculant insert placed in the mould, the third one consisted in similar initial inoculation by the in-stream method during the transfer of metal from the slender ladle to the pouring ladle followed by the secondary inoculation, again by the in-stream method, applied during the pouring operation. Examination of cast iron structure allowed to find that the best results of inoculation are achieved in the case of inoculation carried out according to the Option III, though in all cases it was possible to produce cast iron of EN-GJS-400-15 grade meeting the demands of the Standard.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 95-99
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Chunky Graphite in Nodular Cast Iron on the Base of Numerical Simulation and Experimental Data
    Autorzy:
    Bauer, B.
    Mihalic Pokopec, I.
    Petrič, M.
    Mrvar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352270.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chunky graphite
    nodular cast iron
    numerical simulation
    cooling curve
    microstructure
    Opis:
    Chunky graphite has been recognized for a long time as one of the major problems in production of heavy section nodular cast iron. A great number of studies have been conducted to describe the chunky graphite formation, but a clear understanding of its appearance and a safe mastering of the melt preparation to avoid chunky graphite are not yet available. In the present work the cooling curves were recorded in large cone blocks and standard TA cup. According to measured data from the cone block, melt characteristics and heat transfer coefficient between casting and mould were adjusted in the ProCAST® simulation software. For a near-eutectic nodular cast iron test melt with 0.7 wt.% Ni, relationship between the area of the cone block affected by chunky graphite and simulation software results has been observed, i.e., thermal modulus and time to solidus.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 343-347
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of over-cooling the nodular cast iron to the graphite form in the surface layer
    Autorzy:
    Hosadyna, M.
    Dobosz, S. M.
    Kusiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382407.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    żeliwo sferoidalne
    moduł odlewniczy
    postać grafitu
    nodular cast iron
    casting module
    graphite form
    Opis:
    A cast iron is gradient material. This means that depending on the cooling rate it is possible, at the same chemical composition and the physicochemical state of molten metal, to obtain material with a different structure. The connection between the wall thickness of the casting and the speed of its cooling expresses the casting module. Along with the module escalation a cooling rate of the casting is reducing what can cause changes of the microstructure and the increased tendency to the crystallization of distorted graphite forms. Inspections of experimental castings from nodular cast iron with different modules were conducted to the graphite form.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 43-46
    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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