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    Wyświetlanie 1-14 z 14
    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:
    Development of a manufacturing technology of compacted graphite iron castings from a cupola furnace
    Autorzy:
    Bouska, O.
    Heunisch, J.
    Zadera, A.
    Nedelova, K.
    Kobersky, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/382494.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grafit zagęszczony
    żeliwo sferoidalne
    żeliwiak
    modyfikacja
    compacted graphite iron
    cupola furnace
    modification
    Opis:
    Compacted graphite iron, also known as vermicular cast iron or semiductile cast iron is a modern material, the production of which is increasing globaly. Recently this material has been very often used in automotive industry. This paper reviews some findigs gained during the development of the manufacturing technology of compacted graphite iron under the conditions in Slévárna Heunisch Brno, Ltd. The new technology assumes usage of cupola furnace for melting and is beeing developed for production of castings weighing up to 300 kilograms poured into bentonite sand moulds.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 125-129
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segregation of Admixing Elements in the Boundary Layer of the Main Inlet of a Ductile Iron Casting
    Autorzy:
    Borowiecki, B.
    Mak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/382659.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile iron
    nodular graphite
    boundary layer
    żeliwo sferoidalne
    grafit sferoidalny
    warstwa przyścienna
    Opis:
    The object of the present paper is to determine the distribution of admixing elements, such as magnesium, manganese, silicon and sulfur, in the boundary layer of the main inlet of a ductile iron casting. The authors also intend to demonstrate the influence of elements diffusing from the casting mold, such as oxygen and silica, on the chemical composition of the boundary layer of the casting.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 10-17
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of titanium in Thin Wall Vermicular Graphite Iron Castings production
    Autorzy:
    Górny, M.
    Kawalec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381718.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular graphite
    microstructure
    titanium
    thin walled casting
    grafit wermikularny
    mikrostruktura
    tytan
    odlewanie cienkościenne
    Opis:
    In this paper the effects of titanium addition in an amount up to 0.13 wt.% have been investigated to determine their effect on the microstructure and mechanical properties of Thin Wall Vermicular Graphite Iron Castings (TWVGI). The study was performed for thin-walled iron castings with 3-5 mm wall thickness and for the reference casting with 13 mm. Microstructural changes were evaluated by analyzing quantitative data sets obtained by image analyzer and also using scanning electron microscope (SEM). Metallographic examinations show that in thin-walled castings there is a significant impact of titanium addition to vermicular graphite formation. Thin-walled castings with vermicular graphite have a homogeneous structure, free of chills, and good mechanical properties. It may predispose them as a potential use as substitutes for aluminum alloy castings in diverse applications.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of averaged Voronoi polyhedron in the modelling of crystallisation of eutectic nodular graphite cast iron
    Autorzy:
    Burbelko, A. A.
    Początek, J.
    Królikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381559.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    nodular graphite
    modelling
    averaged Voronoi polyhedron
    żeliwo
    grafit kulkowy
    modelowanie
    wielościan Voronoia
    Opis:
    The study presents a mathematical model of the crystallisation of nodular graphite cast iron. The proposed model is based on micro- and macromodels, in which heat flow is analysed at the macro level, while micro level is used for modelling of the diffusion of elements. The use of elementary diffusion field in the shape of an averaged Voronoi polyhedron [AVP] was proposed. To determine the geometry of the averaged Voronoi polyhedron, Kolmogorov statistical theory of crystallisation was applied. The principles of a differential mathematical formulation of this problem were discussed. Application of AVP geometry allows taking into account the reduced volume fraction of the peripheral areas of equiaxial grains by random contacts between adjacent grains. As a result of the simulation, the cooling curves were plotted, and the movement of "graphite-austenite" and "austenite-liquid” phase boundaries was examined. Data on the microsegregation of carbon in the cross-section of an austenite layer in eutectic grains were obtained. Calculations were performed for different particle densities and different wall thicknesses. The calculation results were compared with experimental data.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 134-140
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparison of Selected Methods of Graphitizing Inoculation Applied after the Spheroidizing Treatment
    Autorzy:
    Gunia, P.
    Soiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381150.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    cast iron structure
    spheroidization
    nodular graphite
    graphitizing inoculation
    metalografia
    struktura żeliwa
    sferoidyzacja
    grafit sferoidalny
    Opis:
    The work compares the effectiveness of selected methods of graphitizing inoculation applied after the spheroidization in the slender tundish ladle of 1 Mg capacity. The inoculation was carried out according to the three various options. The first one was performed simply by means of the block of inoculant inserted in the gating system of the mould, the second one started with initial inoculation by the in-stream method during the transfer of metal from the slender ladle to the pouring ladle and was completed with the secondary modification by means of the inoculant insert placed in the mould, the third one consisted in similar initial inoculation by the in-stream method during the transfer of metal from the slender ladle to the pouring ladle followed by the secondary inoculation, again by the in-stream method, applied during the pouring operation. Examination of cast iron structure allowed to find that the best results of inoculation are achieved in the case of inoculation carried out according to the Option III, though in all cases it was possible to produce cast iron of EN-GJS-400-15 grade meeting the demands of the Standard.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 95-99
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effect of Solidification Time and Addition Amount of Inoculation on Microstructure and Hardness in Lamellar Graphite Cast Iron
    Autorzy:
    Çolak, Murat
    Uslu, Emin
    Teke, Çağatay
    Şafak, F.
    Erol, Ő.
    Erol, Y.
    Çoban, Y.
    Yavuz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lamellar graphite
    graphite cast iron
    inoculation
    solidification time
    modeling
    grafit
    żeliwo
    wszczepienia
    czas krzepnięcia
    modelowanie
    Opis:
    Material suppliers typically recommend different additive amounts and applications for foundry practices. Therefore, even in the production of the same standard materials, different results may be obtained from various production processes on different foundry floors. In this study, the liquid metal prepared with the addition of different proportions of a FeSi-based inoculation, which is most commonly used in foundries in the production of a cast iron material with EN-GJL-250 lamellar graphite cast iron, was cast into sand molds prepared with a model designed to provide different solidification times. In this way, the optimization of the inoculation amounts on the casting structure for different solidification times was investigated. In addition, hardness values were determined depending on solidification time in varying amounts of inoculation additions. SolidCast casting simulation software was used to determine the casting model geometry and solidification time. In the scope of the study, sand casting, modeling, microstructure analysis, image analysis, microstructure analysis, and hardness tests techniques were used. When the results are examined, the required amount of inoculation for the optimal structure is optimized for the application procedure depending on the casting module and the solidification time.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 24--33
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Quality of Ductile Cast Iron EN-GJS-500-7 Through the Influence of its Chemical Composition on the Grain Composition of Spheroidal Graphite
    Autorzy:
    Pacha-Gołębiowska, Halina
    Powiązania:
    https://bibliotekanauki.pl/articles/2203940.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile cast iron
    chemical composition
    graphite precipitates
    stereological parameters
    żeliwo sferoidalne
    skład chemiczny
    grafit
    parametry stereologiczne
    Opis:
    Quantitative evaluation of the microstructure obtained in a product is nowadays commonly required both in R&D activities and during routine quality control of materials and components. This paper presents an assessment of the quality of ductile cast iron, based on investigations of the effect of chemical composition on the distribution of ductile graphite precipitates in low-alloy cast iron EN-GJS-500-7. The size of graphite precipitates was expressed in terms of equivalent cross-sectional diameter, which made it possible to describe the distribution of graphite precipitates with a function simulating the log-normal distribution of graphite. The resulting U, W and Z parameters were statistically analysed, including the effect of chemical composition on graphite distribution. In the studied cast iron, the components that increase the U parameter are silicon, manganese and phosphorus, thus favourably affecting the total graphite number. In contrast, the constituents that decrease the U parameter are carbon, chromium and aluminium.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 85--89
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of modification effect on prototype castings from GJV using ultrasound checking
    Autorzy:
    Skrbek, B.
    Bouška, O.
    Nedělová, K.
    Heunisch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380179.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    żeliwo
    grafit wermikularny
    badanie ultradźwiękowe
    cast iron
    vermicular graphite
    ultrasound checking of structure
    plausibility of results
    Opis:
    Reason for and risks of using of cast iron with vermicular graphite for typical construction parts. Ultrasound checking of graphite shape. Factors influencing plausibility of result. Difference between laboratory and operation application. Roughness, parallelism, stability and size dimension of walls. Conditions, proposals for simplification and productivity enhancement of castings checking.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 105-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination and elimination of defects in cone casting made of ductile cast iron
    Autorzy:
    Guzik, E.
    Łagowski, M.
    Nowak-Dudek, A.
    Niedzielski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380013.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile iron
    cone casting
    casting defect
    ferrite
    pearlite
    graphite
    żeliwo sferoidalne
    stożek odlewniczy
    wada odlewu
    ferryt
    perlit
    grafit
    Opis:
    In the scope of existing cooperation with the Foundry of Cast Iron ZM “WSK Rzeszów” Ltd. there was carried out research work of microstructure and mechanical properties in the walls of a cone casting made of ductile cast iron. The particular attention was being put to the search of the potential brittle phases which have deleterious effect on ductility and dynamic properties of highly strained use of the casting prone to the potential risk of cracks during the highly strained use.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Degradation of Cast Iron Surface - Protective Paint Coat Joint
    Autorzy:
    Tupaj, M.
    Orłowicz, A. W.
    Mróz, A.
    Bąk, G.
    Abram, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381862.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin-wall casting
    flake graphite
    grey cast iron
    corrosion
    protective paint coat
    odlewy cienkościenne
    grafit
    żeliwo szare
    korozja
    powłoka ochronna
    Opis:
    The paper is a presentation of a study on issues concerning degradation of protective paint coat having an adverse impact on aesthetic qualities of thin-walled cast-iron castings fabricated in furan resin sand. Microscopic examination and microanalyses of chemistry indicated that under the coat of paint covering the surface of a thin-walled casting, layers of oxides could be found presence of which can be most probably attributed to careless cleaning of the casting surface before the paint application process, as well as corrosion pits evidencing existence of damp residues under the paint layers contributing to creation of corrosion micro-cells.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 133-136
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coefficient of Friction of a Brake Disc-Brake Pad Friction Couple
    Autorzy:
    Orłowicz, A. W.
    Mróz, M.
    Wnuk, G.
    Markowska, O.
    Homik, W.
    Kolbusz, B,
    Powiązania:
    https://bibliotekanauki.pl/articles/380628.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flake graphite
    cast iron
    brake discs
    abrasive wear resistance
    friction coefficient
    grafit płatkowy
    żeliwo
    tarcza hamulcowa
    odporność na ścierania
    współczynnik tarcia
    Opis:
    The paper concerns evaluation of the coefficient of friction characterising a friction couple comprising a commercial brake disc cast of flake graphite grey iron and a typical brake pad for passenger motor car. For the applied interaction conditions, the brake pressure of 0.53 MPa and the linear velocity measured on the pad-disc trace axis equalling 15 km/h, evolution of the friction coefficient μ values were observed. It turned out that after a period of 50 minutes, temperature reached the value 270°C and got stabilised. After this time interval, the friction coefficient value also got stabilised on the level of μ = 0.38. In case of a block in its original state, stabilisation of the friction coefficient value occurred after a stage in the course of which a continuous growth of its value was observed up to the level μ = 0.41 and then a decrease to the value μ = 0.38. It can be assumed that occurrence of this stage was an effect of an initial running-in of the friction couple. In consecutive abrasion tests on the same friction couple, the friction coefficient value stabilisation occurred after the stage of a steady increase of its value. It can be stated that the stage corresponded to a secondary running-in of the friction couple. The observed stages lasted for similar periods of time and ended with reaching the stabile level of temperature of the disc-pad contact surface.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 196-200
    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:
    Evaluation of Wear Mechanisms of Graphites Used for Crystallisers for Continuous Casting
    Autorzy:
    Brudny, Anna
    Kulasa, Joanna
    Juszczyk, Barbara
    Myalski, Jerzy
    Roskosz, Stanisław
    Wycisk, R.
    Kwaśniewski, Paweł
    Strzępek, Paweł
    Poręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203941.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    wear resistance
    graphite
    crystallizers
    tribology
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    odporność na zużycie
    grafit
    krystalizatory
    tribologia
    Opis:
    This paper presents the results of research concerning the evaluation of tribological properties of graphite materials used, among others, for crystallisers for continuous casting of non-ferrous metals and their alloys. Graphite materials differing not only in their physical properties but also in the technology of their production were selected from a wide range of commercially available products. Wear resistance investigations of the tested graphite materials were carried out on a pin-on-disc tribometer under technically dry friction conditions on a sliding distance of 1000 m. A constant load but variable speed was used in the tests. The mean value of the coefficient of friction and the wear of the material were determined based on the tribological tests carried out. It was observed that as the speed increases, the average value of the coefficient of friction decreases, while the wear increases. A microstructural analysis of the wear track showed that the friction mechanism depends mainly on the graphite formation technology, which is related to the microstructure of the tested materials, and to a lesser extent to their physical and mechanical properties. Varying the speed values made it possible to trace changes in the wear mechanism, on the basis of which it is possible to predict the durability and reliability of graphite crystalliser operation.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 109--115
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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