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Wyszukujesz frazę "Dojka, M." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Development of a New ATD-P Tester for Hard Wear Resistant Materials
    Autorzy:
    Dojka, M.
    Dojka, R.
    Studnicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380369.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crystallization
    TDA
    ATD tester
    wear resistant materials
    krystalizacja
    ATD
    ścieranie
    materiały odporne na ścieranie
    Opis:
    The aim of presented studies was to develop a new geometry of the overflow part of standard ATD–C tester for derivative thermal analysis in a way that it would allow to obtain samples for abrasion and mechanical properties tests in the same mould without the need of cutting them from a block of material. The pattern of new ATD–P tester has parts reflecting implemented samples. Computer simulations regarding initial verification of new tester were performed in NovaFlow software. Chromium cast iron melts were made for testing the sampler in real conditions and TDA analysis for casting material were conducted. The sandmix was prepared on silica sand matrix according to the ALPHASET technology. This new solution greatly simplifies the preparations of materials difficult to machine.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 37-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization Process of High Chromium Cast Iron with the Addition of Ti and Sr
    Autorzy:
    Dojka, M.
    Kondracki, M.
    Studnicki, A.
    Dojka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380888.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chromium cast iron
    crystallization process
    titanium alloy
    strontium
    inoculation
    żeliwo chromowe
    proces krystalizacji
    stop tytanu
    stront
    Opis:
    The paper concerns the processes connected with the formation of chromium white cast iron microstructure. The influence of titanium and strontium on the alloy crystallization has been described using TDA method and EDS analysis. Conducted experiments allowed the determination of the selected additions influence on the microstructure of examined alloys. TDA analysis enabled indication of the characteristic temperatures of thermal effects for samples with strontium and titanium and the comparison of results for the reference sample without additions. The results of TDA test also included the analysis of the temperature first derivative values, which presented interesting differences as well. The scanning microscopy observation clearly indicated the difference between the effect of strontium and titanium on the alloy microstructure. The EDS analysis helped to identify the chemical composition of the evolving phases and confirmed the strontium presence in the eutectic. Experimental results allowed to draw reliable conclusions about the effect of applied additions on the crystallization and microstructure of chromium cast iron.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 57-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical Properties of Silicon Cast Iron
    Autorzy:
    Stawarz, M.
    Kajzer, W.
    Kajzer, A.
    Dojka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381384.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitting corrosion
    alloy cast iron
    SiMo
    silicon cast iron
    obróbka cieplna
    korozja wżerowa
    żeliwo stopowe
    żeliwo silikonowe
    Zaproponuj zmianę
    Opis:
    The article presents results of pitting corrosion studies of selected silicon cast irons. The range of studies included low, medium and high silicon cast iron. The amount of alloying addition (Si) in examined cast irons was between 5 to 25 %. Experimental melts of silicon cast irons [1-3] were conducted in Department of Foundry of Silesian University of Technology in Gliwice and pitting corrosion resistance tests were performed in Faculty of Biomedical Engineering in Department of Biomaterials and Medical Devices Engineering of Silesian University of Technology in Zabrze. In tests of corrosion resistance the potentiostat VoltaLab PGP201 was used. Results obtained in those research complement the knowledge about the corrosion resistance of iron alloys with carbon containing Si alloying addition above 17 % [4-6]. Obtained results were supplemented with metallographic examinations using scanning electron microscopy. The analysis of chemical composition for cast irons using Leco spectrometer was done and the content of alloying element (silicon) was also determined using the gravimetric method in the laboratory of the Institute of Welding in Gliwice. The compounds of microstructure was identify by X-ray diffraction.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 101-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Type and Shape of the Chill on Solidification Process of Steel Casting
    Autorzy:
    Jaromin, M.
    Dojka, R.
    Jezierski, J. R.
    Dojka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380243.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    crystallization process
    computer simulation
    steel casting
    chill
    proces krzepnięcia
    proces krystalizacji
    symulacja komputerowa
    odlewy stalowe
    chłód
    Opis:
    The article is a case study of the steel milling ring casting of about 6 tonnes net weight. The casting has been cast in the steel foundry the authors have been cooperating with. The aim was to analyse the influence of the shape of the chills and the material which was used to make them on the casting crystallization process. To optimally design the chills the set of the computer simulation has been carried out with 3 chills’ shape versions and 3 material’s versions and the results have been compared with the technology being in use (no chills). The proposed chills were of different thermal conductivity from low to high. Their shapes were obviously dependant on the adjacent casting surface geometry but were the result of the attempt to optimise their effect with the minimum weight, too. The chills working efficiency was analysed jointly with the previously designed top feeders system. The following parameters have been chosen to compare their effectiveness and the crystallization process: time to complete solidification and so-called fed volume describing the casting feeding efficiency. The computer simulations have been carried out with use of MagmaSoft v. 5.2 software. Finally, the optimisation has led to 15% better steel yield thanks to 60% top feeders weight reduction and 40% shorter solidification time. The steel ring cast with use of such technology fulfil all quality criteria.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 35-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Casting Velocity on Structure of Al Continuous Ingots
    Autorzy:
    Bartocha, D.
    Wróbel, T.
    Szajnar, J.
    Adamczyk, W.
    Jamrozik, W.
    Dojka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354184.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    primary structure
    ingot
    continuous casting
    simulation of solidification process
    Opis:
    The aim of paper was determination of influence of the casting velocity in horizontal continuous casting process on solidification phenomenon and next primary structure of aluminum ingots. In the range of studies was conducted the experiment concerning continuous casting of Al ingots with diameter 30 mm at velocity from 30 to 80 mm/min. Moreover was developed adequate to the real the virtual model of cooled water continuous casting mould, which was used in simulation of solidification process of Al continuous ingot, made in ANSYS Fluent software. In result was determined the influence of casting velocity and temperature of cooling water on position of crystallization front inside the continuous casting mould. While the shape and size of grains in primary structure of Al continuous ingots were determined on the basis of metallographic macroscopic studies. On the basis of the results analysis was affirmed that increase of casting velocity strongly influences on position of crystallization front and causes increase of temperature of ingot leaving the continuous casting mould. In result the increase of casting velocity supposedly leads to decrease of temperature gradient on crystallization front what creates coarse grains in primary structure of aluminum continuous ingots and caused low usable properties i.e. suitability to plastic deformation.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1609-1613
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Titanium on Crystallization and Wear Resistance of High Chromium Cast Iron
    Autorzy:
    Studnicki, A.
    Dojka, R.
    Gromczyk, M.
    Kondracki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379619.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chromium cast iron
    primary crystallization
    inoculation
    titanium
    wear
    żeliwo chromowe
    krystalizacja
    wszczepienia
    tytan
    zużycie
    Opis:
    Paper presents the results of studies on primary crystallization and wear resistance of high chromium cast iron inoculated with ferrotitanium intended for work in abrasive conditions. Primary crystallization was examined with use of TDA method, wear tests of the samples were conducted using the modified pin-on-disk method.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 117-123
    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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