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    Wyświetlanie 1-5 z 5
    Tytuł:
    Microsegregation in nodular cast iron with carbides
    Autorzy:
    Pietrowski, S.
    Gumienny, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/380448.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    żeliwo sferoidalne
    węgliki
    mikrosegregacja
    innovative foundry technologies
    innovative foundry materials
    nodular cast iron
    carbides
    microsegregation
    Opis:
    In this paper results of microsegregation in the newly developed nodular cast iron with carbides are presented. To investigate the pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The distribution of linear elements on the eutectic cell radius was examined. To investigate the microsegregation pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The linear distribution of elements on the eutectic cell radius was examined. Testing of the chemical composition of cast iron metal matrix components, including carbides were carried out. The change of graphitizing and anti-graphitizing element concentrations within eutectic cell was determined. It was found, that in cast iron containing Mo carbides crystallizing after austenite + graphite eutectic are Si enriched.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 127-134
    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:
    Cast steels for creep-resistant parts used in heat treatment plants
    Autorzy:
    Drotlew, A.
    Garbiak, M.
    Piekarski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380318.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    staliwo austenityczne Ni-Cr
    obróbka cieplna
    innovative foundry technologies
    innovative foundry materials
    cast Ni-Cr austenitic steel
    castings for heat treatment plants
    Opis:
    Creep-resistant parts of heat treatment furnaces are in most cases made from high-alloyed chromium-nickel and nickel-chromium iron alloys, both cast and wrought. This paper presents the types of casting alloys used for this particular purpose, since the majority of furnace components are made by the casting process. Standards were cited which give symbols of alloy grades used in technical specifications by the domestic industry. It has been indicated that castings made currently are based on a wider spectrum of the creep-resistant alloy grades than the number of alloys covered by the standards. Alloy grades recommended by the technical literature for individual parts of the furnace equipment were given. The recommendations reflect both the type of the technological process used and the technical tasks performed by individual parts of the furnace equipment. Comments were also made on the role of individual alloying elements in shaping the performance properties of castings.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 31-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Features of Cast Iron Smelting in Induction Crucible Furnaces
    Autorzy:
    Grachev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/381609.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    heat treatment
    cast iron smelting
    electric induction furnace
    crucible
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    obróbka cieplna
    hutnictwo żeliwa
    piec indukcyjny
    tygiel
    Opis:
    The article describes the trend towards increased use of induction crucible furnaces for cast iron smelting. The use of gas cupola’s duplex process – induction crucible furnace – has been proved the effective direction of scientific and technical advance in the foundry industry. Gas cupolas and induction furnaces are used for cast iron smelting at the Penza Compressor Plant where in the 1960s the author developed and introduced gas cupolas for the first time in the world. In the article, the author represents the findings of the investigation on thermodynamics of crucible reduction of silicon, which is pivotal when choosing the technological mode for cast iron smelting in induction furnaces. The author proposes a new reaction crucible diagram with due account of both partial pressure and activity of the components involved into the process. For the first time ever, the electrochemical mechanism of a crucible reaction has been studied and the correctness of the proposed diagram has been confirmed.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous modification of cast iron by the FLOTRET method
    Autorzy:
    Hanus, A.
    Hanusová, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380281.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    rozwój produktu
    żeliwo sferoidalne
    metoda FLOTRET
    innovative foundry technologies
    innovative foundry materials
    product development
    cast iron
    spheroidal graphite
    modification of graphite shape
    FLOTRET method
    Opis:
    Increasing demands on the utility properties of materials used for castings have led to the production of cast iron with a modified shape of graphite, where the required properties are achieved by a change in graphite shape, its size and layout, and a change in the basic structure of the metal. This paper is focused on the continuous method of producing spheroidal graphite FLOTRET. In the introductory section is summarized the theoretical foundations of the secondary treatment of cast irons, especially the FLOTRET flow method, describes the advantages and disadvantages of the method. The practical part is divided into laboratory and operational tests. Laboratory experiments were conducted on a laboratory-type modifier FLOTRET chamber, which was designed and hydraulically optimized. Experiments were focused on the effects of pressure altitude and amount of modifier on the residual values of magnesium, as conditions for a successful modification. The method was tested in two foundries under operating conditions and in one of them was observed a long-term modification process.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 43-48
    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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