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    Wyświetlanie 1-4 z 4
    Tytuł:
    Study on Improvement of Surface Properties of Low Carbon Steel Using Laser Cladding
    Autorzy:
    Kim, Cheol-Woo
    Yoo, Hyo-Sang
    Jeon, Jae-Yeol
    Cho, Kyun-Taek
    Choi, Se-Weon
    Powiązania:
    https://bibliotekanauki.pl/articles/2048888.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser cladding
    vickers hardness
    microstructure
    surface treatment
    Opis:
    Laser cladding is a method that can be applied to repair the crack and break on the mold and die surfaces, as well as generate new attributes on the surface to improve toughness, hardness, and corrosion resistance. It is used to extend the life of the mold. It also has the advantages of superior bonding strength and precision coating on a local area compared with the conventional thermal spraying technology. In this study, we investigated the effect of cladding on low carbon alloy steel using 18%Cr-2.5%Ni-Fe powder (Rockit404), which showed high hardness on the die surface. The process conditions were performed in an argon atmosphere using a diode laser source specialized for 900-1070 nm, and the output conditions were 5, 6, and 10 kW, respectively. After the cladding was completed, the surface coating layer’s shape, the hardness according to the cross-section’s thickness, and the microstructure were analyzed.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1033-1036
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Mechanical Characterization of Zirconium Based Sol-Gel Coatings on Glass
    Autorzy:
    Sitarz, M.
    Drajewicz, M.
    Jadach, R.
    Długoń, E.
    Leśniak, M.
    Reben, M.
    Wajda, A.
    Gawęda, M.
    Burtan-Gwizdała, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352458.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel coating
    zirconium oxide
    ellipsometry
    Vickers hardness
    Opis:
    The basic factor limiting the use of glasses is their unsatisfactory mechanical strength. The improvement of the mechanical strength of glasses is usually obtained by applying their respective thin surface layers. The object of the research was glass coated with zirconium oxide. For the application of zirconium oxide layer, dip-coating method was used. The resulting materials were subjected to detailed examination of the microstructure (SEM), and mechanical tests (Vickers hardness and modulus of elasticity). In order to evaluate the optical characteristics, the tests were performed by UV/VIS. The thickness of the overlying layers were determined using the method of ellipsometry. The study showed that the obtained sol-gel layer of zirconium oxide (IV) on glasses influence the improvement of the mechanical properties. It has been shown that the applied layers have high adhesion to the substrate.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1747-1752
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Improvement of Surface Properties of SKD61 Powder on S45C Using Laser Cladding
    Autorzy:
    Kim, Cheol-Woo
    Yoo, Hyo-Sang
    Powiązania:
    https://bibliotekanauki.pl/articles/2174572.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser cladding
    Micro Vickers hardness
    microstructure
    polarization curve
    Opis:
    In this study, we investigated the effect of cladding on structural carbon steel (S45C) using 5%Cr-1.5%Mo-Fe powder (SKD61), which is expected to show economically efficient production of die-casting parts. The process conditions were performed under argon atmosphere using a diode laser source with specialized wavelength of 900-1070 nm, and the output conditions were 3, 4, and 5 kW, respectively. After the cladding was completed, the surface coating layer’s shape and the microstructure were analyzed. The hardness test was carried out with Micro Vickers hardness tester under 500 gram-force along the normal line at the interval of 0.2 mm from the surface to core direction on the cross-sectional area. In addition, polarization curve test of the surface coating layer was performed to investigate the corrosion resistance characteristics.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1465--1468
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Structures Assessment of Some TRIP Steels
    Autorzy:
    Pantilimon, Mircea Cristian
    Berbecaru, Andrei-Constantin
    Coman, George
    Sohaciu, Mirela G.
    Dumitrescu, Ruxandra Elena
    Ciucă, Sorin
    Gherghescu, Ioana-Arina
    Predescu, Cristian
    Powiązania:
    https://bibliotekanauki.pl/articles/27313868.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    TRIP steel
    optical microscopy
    Vickers hardness
    retained austenite
    car body material
    Opis:
    Automotive industry is constantly interested in building cars made of light and high strength parts in order to reduce the emission levels, the fuel consumption and minimize the effects of a car crash. Some parts may be made of lighter materials, but the steel ones must compensate the strength needed for the car body. Research is made for finding new materials showing high strength combined with high ductility. Among them, transformation - induced - plasticity steels are of great interest, efforts being made to improve their characteristics. A new composition of such a steel is presented, its features being compared with those of three other steels of the same class and category. Optical microscopy at different magnifications is performed, together with Vickers hardness test. Structural particularities are found for each tested steel, justified by their own chemical compositions. The new steel reveals important characteristics: besides the mainly bainitic structure, it has both larger ferritic areas and amounts of retained austenite, making him proper for further study.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 491--498
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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