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    Wyświetlanie 1-6 z 6
    Tytuł:
    Prediction of Microstructure of Grey Cast Irons by Electrical Resistivity Measurements
    Autorzy:
    Petrič, M.
    Mrvar, P.
    Kastelic, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/354044.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification
    grey cast iron
    electrical resistivity
    graphite shape
    microstructure
    Opis:
    The paper describes the influence of graphite shape, size and amount to electrical properties of different cast irons. Experiments of electrical resistivity measurements were conducted during solidification of four different melts in different time intervals from melt treatment by inoculation and nodularization. Metallographic analyses were made in order to determine the shape, size, distribution and amount of graphite and correlate results with electrical resistivity measurements. It was found out that nodular graphite is giving the lowest electrical resistivity and is decreased during solidification. Electrical resistivity of lamellar cast iron is increased during solidification since lamellas interrupt metal matrix severely. There is no significant difference in resistivity of vermicular cast iron from nodular cast iron. Smaller size of graphite and lower amount of graphite and higher amount of metal matrix also decrease resistivity.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 365-369
    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:
    Control of Selected Properties of „Vari-Morph” (VM) Cast Iron by Means of the Graphite form Influence, Described by the Mean Shape Indicator
    Autorzy:
    Zych, J.
    Myszka, M.
    Kaźnica, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/382206.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    VARI-MORPH cast iron
    graphite shape indicator
    heat fatigue
    control of selected properties
    żeliwo VARI-MORPH
    wskaźnik kształtu
    zmęczenie cieplne
    kontrola wybranych właściwości
    Opis:
    The graphite form in cast iron is the structure parameter deciding on its all physical and mechanical properties. Three basic forms of graphite: flake, vermicular (compact) and nodular (spheroidal) are singled out in standard cast iron grades, without a heat treatment. Standards of individual grades of cast iron the most often allow only the homogeneous graphite form, sometimes with addition of 5÷10% of the other form. The interesting and - in the authors opinion - future-oriented material can constitute cast iron in which various forms of graphite are present, e.g. in comparative amounts: spherical and vermicular cast irons. Cast iron within which graphite occurs in two or three forms was named „Vari-Morph” (VM) cast iron, i.e. the one in which spherical and vermicular or vermicular and flake graphite occur in a wide range of proportions. The results of investigations of these new cast iron grades and their properties are presented in the hereby paper.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 43-48
    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
    Tytuł:
    Influence of Structural Parameters - the Shape of Graphite and Matrix on Change of Ultrasonic Wave Propagation Rate and Value of Attenuation in Graphitic Cast Irons
    Autorzy:
    Belan, Juraj
    Tillová, Eva
    Uhríčik, Milan
    Pastierovičová, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/26081550.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    badanie ultradźwiękowe
    zapewnienie jakości żeliwa
    grafitowy kształt
    współczynnik perlitu i ferrytu
    ultrasonic investigation
    quality assurance of cast iron
    graphite shape
    pearlite and ferrite ratio
    quantitative evaluation of graphite and matrix
    Opis:
    Despite the tendency of the current industry, especially the automotive industry, it is to use modern, light and super-strong materials based on Al or HSLA steels, the application of classic materials such as cast iron still makes sense, especially concerning price and excellent castability. The article presents one of the possible ways of using the ultrasonic non-destructive method in quality control and simpli-fication of the identification of the type of cast iron concerning the change of parameters of ultrasound propagation in materials. The main criteria for assessing the quality and determining the type of graphite cast iron were considered to be the rate of propagation of ultrasound - cL and the value of attenuation , which vary depending on the shape of the graphite and matrix. Graphitic cast irons with different graphite shapes (lamellar, vermicular, and globular shapes) and a matrix with different ferrite/perlite ratios were used as experimental material. Along with the ultrasonic tests, a metallographic analysis was also performed to quantify the microstructure of cast irons.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 23--27
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between shape factor and mechanical properties of graphitic cast irons
    Autorzy:
    Vasko, A.
    Vasko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973009.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    shape factor
    cast iron
    graphite
    microstructure
    mechanical properties
    współczynnik kształtu
    żeliwo
    grafit
    mikrostruktury materiałów
    właściwości mechaniczne
    Opis:
    The evaluation of shape factor (circularity) is a subject of interest in many fields of applications such as medicine and industrial processes. The shape factor plays an important role in materials science as a way to understand the relationship between microstructure and mechanical properties of technical materials. The paper deals with measurement of shape factor of graphitic particles with the aim to understand the influence of microstructure (especially shape of graphite) on mechanical properties of graphitic cast irons.
    Źródło:
    Production Engineering Archives; 2016, 11, 2; 11-14
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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