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    Wyświetlanie 1-6 z 6
    Tytuł:
    Wear Mechanism of Spheroidal Cast Iron Piston Ring-Aluminum Matrix Composite Cylinder Liner Contact
    Autorzy:
    Bąkowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/352888.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    spheroidal graphite
    wear mechanism
    stereological parameters
    Opis:
    The paper presents the results of research on the impact of stereological characteristics of microstructure of graphite in nodular GJS-400 cast iron and Al2 O3 fibers in the composite AC-47000 + 10% Al2 O3 F on the mechanism of wear in a cast iron piston ring – composite cylinder liner contact in a combustion engine. To elucidate the mechanisms of wear in the tested contact was used Finite Element Method (FEM). On the basis of quantitative metallographic examination of test materials were determined stereological parameters of their structures. It was necessary for the implementation of the 3D model that reflects the actual structure with particular focus on the different phases in order to determine the distribution of stresses and strains. The determination Strains of the local stresses value of allowed the prediction of wear initiating places. Formation of stereological parameters of cast iron in the technological process allows a prediction of values and distributions of the stresses/strains and thus reduce wear and extend durability of the analyzed contact.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 481-490
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Bismuth and Rare Earth Elements on Graphite Structure in Different Section Thicknesses of Spheroidal Graphite Cast Iron Castings
    Autorzy:
    Glavas, Z.
    Strkalj, A.
    Maldini, K.
    Kozina, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/353810.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spheroidal graphite cast iron casting
    graphite structure
    bismuth
    rare earth elements
    microstructure
    Opis:
    Effects of additions of 0.00064, 0.001 and 0.0042 wt.% Bi on the graphite structure in the section thicknesses of 3, 12, 25, 38, 50, 75 and 100 mm of spheroidal graphite cast iron castings containing 2.11 wt.% Si and rare earth (RE) elements (Ce + La + Nd + Pr + Sm + Gd) in the range from 0.00297 to 0.00337 wt.% were analyzed in this paper. Addition of Bi was not necessary for obtaining high nodule count and nodularity higher than 80% in section thicknesses of 3, 12 and 25 mm. RE elements showed a beneficial effect on the nodule count and nodularity in these sections. Nodularity was below 80% in section thicknesses of 38, 50, 75 and 100 mm when Bi was not added. Detrimental effect of RE elements on graphite morphology in these sections was neutralized by adequate addition of Bi. Addition of 0.001 wt.% Bi (ratio of RE/Bi = 3.27) was enough to achieve nodularity above 80% in the section thickness of 38 mm. Nodularity was increased above 80% in section thicknesses of 50, 75 and 100 mm by addition of 0.0042 wt.% Bi (ratio of RE/Bi = 0.78). At the same time, Bi significantly increased the nodule count. Nodularity above 80% and the high nodule count in the section thicknesses of 75 and 100 mm were also achieved by using an external metallic chill in the mold. In this case, addition of Bi was not required.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1547-1553
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation of spheroidal graphite in ductile cast iron by TEM
    Charakterystyka grafitu w żeliwie sferoidalnym techniką transmisyjnej mikroskopii elektronowej
    Autorzy:
    Hara, T.
    Maekawa, T
    Terayama, K
    Kawabata, T.
    Ikeno, S.
    Matsuda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/354792.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile cast iron
    spheroidal graphite
    TEM
    FIB method GRAPHITE
    grafit sferoidalny
    technika FIB
    transmisyjna mikroskopia elektronowa
    Opis:
    The microstructure of spheroidal graphites in ductile cast iron (FCD450) was investigated by TEM using cross sectional TEM samples prepared by FIB method. The spheroidal graphite consisted of many small areas, and all of these areas were indexed as the graphite structure and just carbon peak was detected from there.
    Mikrostruktura sferoidalnych wydzieleń grafitu w żeliwie sferoidalnym (FCD450) badana była przy użyciu transmisyjnej mikroskopii elektronowej i cienkich folii przygotowanych technika FIB. Grafit sferoidalny składał się z wielu małych obszarów i stwierdzono, że wszystkie te obszary mają strukturę grafitu i wykryto tylko pik od wegla.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 431-432
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Reliability of the Results of the Modified Low-cycle Fatigue Test for Cast Iron Evaluated by Metallographic Studies
    Autorzy:
    Maj, M.
    Pietrzak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379799.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    lamellar graphite
    spheroidal graphite
    low cycle fatigue test
    mechanical properties
    żeliwo
    grafit płatkowy
    grafit sferoidalny
    zmęczenie niskocyklowe
    właściwości mechaniczne
    Opis:
    This study discloses the characteristic features of the modified low-cycle fatigue test used for the determination of the mechanical properties of two types of cast iron, i.e. EN-GJL-250 and EN-GJS-600-3. For selected materials, metallographic studies were also conducted in the range of light microscopy and scanning microscopy.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 41-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermetallic Phases in Alloyed Cast Iron with 18%Si Addition
    Autorzy:
    Stawarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946866.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    solidification process
    intermetallic phases
    spheroidal graphite
    silicon cast iron
    teoria krystalizacji
    proces krzepnięcia
    fazy międzymetaliczne
    grafit sferoidalny
    żeliwo silikonowe
    Opis:
    The paper presents an analysis of a selected grade of high silicon cast iron intended for work in corrosive and abrasive conditions. The text describes its microstructure taking into account the process of crystallization, TDA analysis, EDS, XRD and the chemical composition analysis. In order to determine the phase composition, X-ray diffraction tests were carried out. The tests were executed on a Panalytical X'Pert PRO X-ray diffractometer with filtration of radiation from a lamp with copper anode and PIXcel 3D detector on the deflected beam axis. Completed tests allowed to describe the microstructure with detailed consideration of intermetallic phases present in the alloy. Results of the analysis of the examined alloy clearly show that we deal with intermetallic phases of Fe3Si, Fe5Si3 types, as well as silicon ferrite and crystals of silicon. In the examined alloy, we observed the phenomenon of segregation of carbon, which, as a result of this process, enriches the surface of silicon crystals, not creating a compound with it. Moreover, the paper demonstrates capability for crystallization of spheroidal graphite in the examined alloy despite lack of elements that contribute to balling in the charge materials.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 37-42
    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 1-6 z 6

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