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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Chromium on the Solidification Process and Microstructure of Vermicular Graphite Cast Iron
    Autorzy:
    Gumienny, G.
    Dondzbach, M.
    Kacprzyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381406.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    vermicular graphite cast iron
    crystallization
    TDA method
    teoria krystalizacji
    żeliwo grafitowe wermikularne
    proces krystalizacji
    metoda ATD
    Opis:
    The paper presents the results of studies of the effect of chromium concentration on the solidification process, microstructure and selected properties of cast iron with vermicular graphite. The vermicular graphite cast iron was obtained by an Inmold process. Studies covered the cast iron containing chromium in a concentration at which graphite is still able to preserve its vermicular form. The effect of chromium on the temperature of eutectic crystallization and on the temperature of the start and end of austenite transformation was discussed. The conditions under which, at a predetermined chromium concentration, the vermicular graphite cast iron of a pearlitic matrix is obtained were presented, and the limit concentration of chromium was calculated starting from which partial solidification of the cast iron in a metastable system takes place. The effect of chromium on the hardness of cast iron, microhardness of individual phases and surface fraction of carbides was disclosed.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cooling Rate on Microstructure of Thin-Walled Vermicular Graphite Iron Castings
    Autorzy:
    Górny, M.
    Kawalec, M.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/380738.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative materials
    vermicular graphite cast iron
    cooling rate
    thermal analysis
    microstructure
    innowacyjne technologie odlewnicze
    materiały innowacyjne
    żeliwo grafitowe wermikularne
    chłodzenie
    analiza termiczna
    mikrostruktura
    Opis:
    This article addresses the effect of cooling rate and of titanium additions on the microstructure of thin-walled vermicular graphite iron (TWCI) castings as determined by changing molding media, section size and Ferro Titanium. The research work was carried out on TWCI castings and reference castings of 2-5 mm and 13-mm wall thickness, respectively. Various molding materials were employed (silica sand and insulating sand ‘‘LDASC’’) to achieve different cooling rates. Thermal analysis was implemented for determinations of the actual cooling rates at the onset of solidification. This study shows that the cooling rates exhibited in the TWCI castings varies widely (70- 14oC/s) when the wall thickness is changed from 2 to 5 mm. In turn, this is accompanied by a significant variation in the vermicular graphite fraction. The resultant cooling rates were effectively reduced by applying an insulating sand in order to obtain the desired vermicular graphite shape. In addition, good agreement was found between the theoretical predictions of the solidification process and the experimental outcome. Ti additions in combination with LDASC sand molds were highly effective in promoting the development of over 80 % vermicular graphite in castings with wall thicknesses of 2 and 3 mm as evidenced by quantitative metallographic analyses.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 139-142
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Operating Performance of a Cast-Iron Heat Exchanger by Application of a Copper Alloy Coating
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Jacek-Burek, M.
    Radoń, M.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380088.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular graphite cast iron
    CuTi2Cr coating
    heat flow rate
    heat exchanger
    improvement of performance
    żeliwo grafitowe wermikularne
    powłoka CuTi2Cr
    natężenie przepływu ciepła
    wymiennik ciepła
    poprawa wydajności
    Opis:
    The paper deals with possibility to improve operating performance of cast-iron heat exchangers by providing them with a copper alloy (CuTi2Cr) with the use of the flame spraying method. A test exchanger was cast of a gray cast iron with vermicular graphite in ferritic-pearlitic matrix obtained in production conditions at KAW-MET Iron Foundry with the wire method used to vermicularize the material. The test samples were two plates cast in sand molds, of which one was given a flame-sprayed CuTi2Cr coat on one side. The operating performance of such model cast-iron heat exchangers, with and without CuTi2Cr coating, was tested on a set-up for determining the heat flow rate (thermal power) transferred by the heat exchanger to environment. The obtained results indicate that the value of the heat flow rate characterizing the CuTi2Cr-coated cast-iron heat exchanger was by 10% higher compared to the flow rate of heat conveyed to environment by the heat exchanger without coating.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 84-87
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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