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    Wyświetlanie 1-3 z 3
    Tytuł:
    Testing of Air-Cooling Efficiency of the Underside of a Turning Tool Carbide Insert in EN-GJL 250 Cast Iron Turning Operations
    Autorzy:
    Bartoszuk, Marian
    Prażmowski, Mariusz
    Hurey, Igor
    Powiązania:
    https://bibliotekanauki.pl/articles/2201829.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cast-iron machining
    air cooling systems
    cutting temperature
    surface roughness
    tool wear
    Opis:
    This article shows the results of research on the effectiveness of operation of an original tool air cooling system in cutting. A case of turning EN-GJL 250 cast iron with TH10 tungsten carbide cutting inserts without protective coatings was selected for testing. The paper gives constructional details of the tested tool cooling system and discusses the principle of its operation. The research carried out has shown that this way of cooling the cutting insert causes a significant decrease in temperature in all sub-areas of the cutting zone. In addition, air cooling has been proven to significantly reduce cutting tool wear and slightly improve the roughness of the machined surface. The results obtained showed that the proposed method of cooling can be successfully used in the treatment of grey cast iron. In the future, it may serve as a basis for the construction of a professional cooling system for industrial applications.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 4; 1--9
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigations of the bonding zone in the explosive welding of a differently structured steel-zirconium platers
    Autorzy:
    Prazmowski, Mariusz
    Paul, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/100109.pdf
    Data publikacji:
    2019
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    explosive welding
    zirconium/steel clad
    technological interlayer
    Opis:
    In this work the results of trials aimed at selecting optimal settings of the explosion welding process of 10 mm thick zirconium (Zr 700 grade) plates with carbon steel (P265GH grade) are presented. A bimetal Zr-steel and trimetal Zr-Ti-steel and Zr-Zr-steel where: 2 mm Ti and 3 mm Zr were used as a technological intermediate layer facilitating the bonding. The research was carried out for as-bonded joints, i.e. immediately following explosion welding. Structural analyses in leyers near the interface were focused on the characteristic of the joint interface. Mechanical properties of the obtained clads were measured with shearing, peel and lateral bending tests. Systematic measurements of microhardness distribution enabled analyzing the strain-hardening of the material resulting from explosion welding both at the bond interface zone and throughout the whole section of the clad. It was established that during explosion welding with 10 mm Zr 700 the application of the 2 mm or 3 mm thick interlayers of Zr70 or Ti grade 1, respectively, allows obtaining a joint with good mechanical properties and optimal characteristic of the interface.
    Źródło:
    Journal of Machine Engineering; 2019, 19, 2; 99-110
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Lattice Rotations Induced by Shear Banding in fcc Metals Deformed at High Strain Rates
    Autorzy:
    Mania, Izabela
    Paul, Henryk
    Chulist, Robert
    Petrzak, Paweł
    Miszczyk, Magdalena
    Prażmowski, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2203719.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    shear bands
    high strain rates
    texture
    SEM/EBSD
    Opis:
    In this paper, the microstructural and texture changes in polycrystalline CuZn30 alloy, copper, and AA1050 aluminium alloy have been studied to describe the crystal lattice rotation during shear bands formation. The hat-shaped specimens were deformed using a drop-hammer at the strain rate of 560 s-1. Microstructure evolution was investigated using optical microscopy, whereas texture changes were examined with the use of a scanning electron microscope equipped with the EBSD facility. The microstructural observations were correlated with nanohardness measurements to evaluate the mechanical properties of the sheared regions. The analyses demonstrate the gradual nature of the shear banding process, which can be described as a mechanism of the bands nucleation and then successive growth rather than as an abrupt instability. It was found that regardless of the initial orientation of the grains inside the sheared region, a well-defined tendency of the crystal lattice rotation is observed. This rotation mechanism leads to the formation of specific texture components of the sheared region, different from the one observed in a weakly or non-deformed matrix. During the process of rotation, one of the {111} planes in each grain of the sheared region ‘tends’ to overlap with the plane of maximum shear stresses and one of the <110> or <112> directions align with the shear direction. This allows slip propagation through the boundaries between adjacent grains without apparent change in the shear direction. Finally, in order to trace the rotation path, transforming the matrix texture components into shear band, rotation axis and angles were identified.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 319--329
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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