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    Wyświetlanie 1-6 z 6
    Tytuł:
    Thermal Coefficients of the GTAW Process
    Autorzy:
    Orłowicz, A. W.
    Trytek, A.
    Tupaj, M.
    Mróz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/383027.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal efficiency
    remelting process
    flow calorimeter
    sprawność cieplna
    przetapianie
    kalorymetr przepływowy
    Opis:
    The paper presents a discussion on the issue of thermal efficiency of the process of superficial remelting of castings by means of the gas tungsten arc welding (GTAW) process. Described and characterized are calorimeters used in research studies on efficiency of welding processes and the obtained results. Example results are presented from the measurements aimed at determination of thermal efficiency of the welding process carried out with the use of the flow calorimeter.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 63-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Structure on the Thermophisical Properties of Thin Walled Castings
    Autorzy:
    Górny, M.
    Lelito, J.
    Kawalec, M.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/382519.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    thin walled casting
    graphite morphology
    thermal diffusivity
    specific heat
    thermal conductivity
    proces krzepnięcia
    odlew cienkościenny
    morfologia grafitu
    dyfuzyjność termiczna
    ciepło właściwe
    przewodność cieplna
    Opis:
    This study addresses the effect of the cooling rate and of titanium additions on the thermophysical parameters of thin-walled compacted graphite iron (TWCGI) castings. Various molding materials were used (silica sand and insulating sand LDASC- Low-Density Alumina-Silicate Ceramic) to achieve different cooling rates. Different titanium additions were caused by various amount of Ferro Titanium. The research work was conducted for thin-walled iron castings with a 3-mm wall thickness. The tested material represents the occurrence of graphite in the shape of flakes (C and D types, according to the ISO Standard), nodules or compacted graphite with a percent of nodularity and different shape factor. Thermal conductivity has been determined by the laser flash technique in a temperature range of 22-600°C. The results show that the cooling rates together with the titanium content largely influence the graphite morphology and finally thermal conductivity of thin walled iron castings.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382327.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    thermal analysis
    crystallization process
    stop nadeutektyczny Al-Si
    przegrzanie
    analiza termiczna
    proces krystalizacji
    Opis:
    In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Heat Removal from the Casting Mould on the Crystallization High Silicon Cast Iron
    Autorzy:
    Stawarz, M.
    Gromczyk, M.
    Szajnar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382988.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal derivative analysis
    intermetallic phase
    high silicon cast iron
    crystallization process
    analiza termiczno-derywacyjna
    faza międzymetaliczna
    żeliwo wysokokrzemowe
    proces krystalizacji
    Opis:
    Silicon cast iron with high chemical resistance, which is the biggest advantage of this material, did not have any competition for a long time. It was popular on the market of metal materials because of its low price. However, the production of this material requires special attention and precautions, which is a barrier for foundry. The article presents the results of research of high silicon cast iron crystallization based on thermal derivative analysis (which has identified characteristic temperatures of the investigated alloy crystallization process basis on the part of Fe–Si phase diagram and process analysis using calculations made in Thermo–Calc software) and metallographic analysis of the structure.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Verification of the Cast Iron Solidification Model
    Autorzy:
    Mendakiewicz, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2174627.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    application of information technology
    solidification process
    numerical techniques
    thermal analysis
    derivative analysis
    przemysł odlewniczy
    zastosowanie technologii informatycznych
    krzepnięcie
    techniki numeryczne
    analiza termiczna
    Opis:
    The article concerns the experimental verification of the numerical model simulating the solidification and cooling processes proceeding in the domain of cast iron casting. The approximate course of the function describing the evolution of latent heat and the value of substitute specific heat resulting from its course were obtained using the thermal and derivative analysis (TDA) method The TDA was also used to measure the cooling curves at the distinguished points of the casting. The results obtained in this way were compared with the calculated cooling curves at the same points. At the stage of numerical computations, the explicit scheme of the finite difference method was applied. The agreement between the measured and calculated cooling curves is fully satisfactory.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 91--94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definition of alloy substitute thermal capacity using the simple macrosegregation models
    Autorzy:
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380456.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    proces krzepnięcia
    zastępcza pojemność cieplna
    metody numeryczne
    information technology
    foundry industry
    solidification process
    one domain method
    substitute thermal capacity
    numerical methods
    Opis:
    Mathematical description of alloys solidification in a macro scale can be formulated using the one domain method (fixed domain approach). The energy equation corresponding to this model contains the parameter called a substitute thermal capacity (STC). The analytical form of STC results from the assumption concerning the course of the function fs = fs (T) describing the changes of solid state volumetric fraction and the temperature at the point considered. Between border temperatures Ts , Tl the function fs changes from 1 to 0. In this paper the volumetric fraction fs (more precisely fl = 1- fs) is found using the simple models of macrosegregation (the lever arm rule, the Scheil model). In this way one obtains the formulas determining the course of STC resulting from the certain physical considerations and this approach seems to be closer to the real course of thermal processes proceeding in domain of solidifying alloy.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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