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    Wyświetlanie 1-8 z 8
    Tytuł:
    The Effect of Manganese on the Crystallisation Process, Microstructure and Selected Properties of Compacted Graphite iron
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Just, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/354354.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compacted graphite iron
    crystallization
    manganese
    DTA method
    Opis:
    The paper presents the effect of manganese on the crystallization process, microstructure and selected properties: cast iron hardness as well as ferrite and pearlite microhardness. The compacted graphite was obtained by Inmold technology. The lack of significant effect on the temperature of the eutectic transformation was demonstrated. On the other hand, a significant reduction in the eutectoid transformation temperature with increasing manganese concentration has been shown. The effect of manganese on microstructure of cast iron with compacted graphite considering casting wall thickness was investigated and described. The nomograms describing the microstructure of compacted graphite iron versus manganese concentration were developed. The effect of manganese on the hardness of cast iron and microhardness of ferrite and pearlite were given.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1269-1275
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nickel in Compacted Graphite Iron
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Szymczak, T.
    Gawroński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352803.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compacted graphite iron
    crystallization process
    DTA method
    Opis:
    The paper presents results of the research work concerning effects of nickel concentration on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in the cast iron was obtained with use of the Inmold process. The study has comprised the cast iron containing nickel up to concentration providing obtainment of austenitic microstructure of the matrix. The effect of the nickel on temperature of the eutectic crystallization was specified. It has been presented composition of the cast iron matrix in function of nickel concentration in a casting with wall thickness of 3 mm and 24 mm. Moreover, it has been presented conditions defining the possibility of obtaining an austenitic and martensitic compacted graphite iron. Effect of the nickel on hardness of the cast iron was described.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 657-662
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Graphite Shape in Cast Iron Obtaining by Inmold Process
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381705.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    inmold process
    graphite shape
    teoria krystalizacji
    technologia inmold
    żeliwo sferoidalne
    Opis:
    The paper presents results of research on the effect of magnesium on the graphite shape in cast iron obtained by Inmold process. For testing Lamet® 5504 master alloy was used. The crystallization process of cast iron with various Mg concentrations was evaluated with use of the thermal and derivative analysis (TDA) method. The conditions were demonstrated for which a flake, vermicular and nodular graphite were obtained. Values of graphite “c” coefficient were analyzed. Results from it the significant differences between the assessment of the graphite on metallographic specimen and by the "c" coefficient. An effect of wall thickness of the casting on the graphite coefficient was indicated.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compacted Graphite Iron with the Addition of Tin
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Fabian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/947624.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crystallization
    graphite irons
    tin
    cooling curve
    microstructure
    krystalizacja
    żeliwo grafitowe
    cyna
    krzywa chłodzenia
    mikrostruktura
    Opis:
    The paper presents the effect of tin on the crystallization process, microstructure and hardness of cast iron with compacted (vermicular) graphite. The compacted graphite was obtained with the use of magnesium treatment process (Inmold technology). The lack of significant effect of tin on the temperature of the eutectic transformation has been demonstrated. On the other hand, a significant decrease in the eutectoid transformation temperature with increasing tin concentration has been shown. It was demonstrated that tin narrows the temperature range of the austenite transformation. The effect of tin on the microstructure of cast iron with compacted graphite considering casting wall thickness has been investigated and described. The carbide-forming effect of tin in thin-walled (3 mm) castings has been demonstrated. The nomograms describing the microstructure of compacted graphite iron versus tin concentration have been developed. The effect of tin on the hardness of cast iron was given.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximation of Ausferrite Content in the Compacted Graphite Iron with the Use of Combined Techniques of Data Mining
    Autorzy:
    Regulski, K.
    Wilk-Kołodziejczyk, D.
    Kacprzyk, B.
    Gumienny, G.
    Rojek, G.
    Mrzygłód, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379587.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technologies
    foundry
    graphite irons
    compacted
    ausferrite
    data mining
    regression
    odlewnictwo
    technologie informacyjne
    zagęszczanie
    żeliwo grafitowe
    Opis:
    This article presents the methodology for exploratory analysis of data from microstructural studies of compacted graphite iron to gain knowledge about the factors favouring the formation of ausferrite. The studies led to the development of rules to evaluate the content of ausferrite based on the chemical composition. Data mining methods have been used to generate regression models such as boosted trees, random forest, and piecewise regression models. The development of a stepwise regression modelling process on the iteratively limited sets enabled, on the one hand, the improvement of forecasting precision and, on the other, acquisition of deeper knowledge about the ausferrite formation. Repeated examination of the significance of the effect of various factors in different regression models has allowed identification of the most important variables influencing the ausferrite content in different ranges of the parameters variability.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 117-122
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper in Ausferritic Compacted Graphite Iron
    Autorzy:
    Gumienny, G.
    Kacprzyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381542.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    compacted graphite iron
    ausferrite
    DTA method
    teoria krystalizacji
    stop żelaza
    ausferyt
    metoda DTA
    Opis:
    This paper shows how it is possible to obtain an ausferrite in compacted graphite iron (CGI) without heat treatment of castings. Vermicular graphite in cast iron was obtained using Inmold technology. Molybdenum was used as alloying additive at a concentration from 1.6 to 1.7% and copper at a concentration from 1 to 3%. It was shown that ausferrite could be obtained in CGI through the addition of molybdenum and copper in castings with a wall thickness of 3, 6, 12 and 24 mm. Thereby the expensive heat treatment of castings was eliminated. The investigation focuses on the influence of copper on the crystallization temperature of the graphite eutectic mixture in cast iron with the compacted graphite. It has been shown that copper increases the eutectic crystallization temperature in CGI. It presents how this element influences ausferrite microhardness as well as the hardness of the tested iron alloy. It has been shown that above-mentioned properties increases with increasing the copper concentration.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 162-166
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Copper on the Crystallization Process, Microstructure and Selected Properties of CGI
    Autorzy:
    Gumienny, G.
    Kacprzyk, B.
    Gawroński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381656.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    compacted graphite iron
    copper
    DTA method
    teoria krystalizacji
    zagęszczone żelazo grafitowe
    miedź
    metoda DTA
    Opis:
    The paper presents the results of the research on the effect of copper on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in cast iron was obtained using Inmold process. The study involved the cast iron containing copper at a concentration up to approximately 4%. The effect of copper on the temperature of the eutectic crystallization as well as the temperature of start and finish of the austenite transformation was given. It has been shown that copper increases the maximum temperature of the eutectic transformation approximately by 5 oC per 1% Cu, and the temperature of the this transformation finish approximately by 8 o C per 1% Cu. This element decreases the temperature of the austenite transformation start approximately by 5 oC per 1% Cu, and the finish of this transformation approximately by 6oC per 1% Cu. It was found that in the microstructure of the compacted graphite iron containing about 3.8% Cu, there are still ferrite precipitations near the compacted graphite. The effect of copper on the hardness of cast iron and the pearlite microhardness was given. This stems from the high propensity to direct ferritization of this type of cast iron. It has been shown copper increases the hardness of compacted graphite iron both due to its pearlite forming action as well as because of the increase in the pearlite microhardness (up to approx. 3% Cu). The conducted studies have shown copper increases the hardness of the compacted graphite iron approximately by 35 HB per 1% Cu.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 51-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-8 z 8

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