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    Wyświetlanie 1-5 z 5
    Tytuł:
    Mechanical Properties of Composites with Titanium Diboride Fabricated by Spark Plasma Sintering
    Autorzy:
    Sulima, I.
    Boczkal, G.
    Palka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352589.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    spark plasma sintering (SPS)
    mechanical properties
    Opis:
    Microstructure and mechanical properties of the 316L steel composite reinforced with TiB2 phase were examined. The test materials were obtained by SPS technique from powders. From testing of the mechanical properties it follows that the optimum temperature for the fabrication of 316Lsteel-TiB2 composites by SPS is 1100°C. Studies have also proved that the critical content of TiB2 phase in steel matrix should not exceed 6vol%. Above this level, the plastic properties of the composite become unstable and strongly dependent on the time of sintering.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1665-1671
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Thermoelectric Properties of Inconel 625/Pt Microjoint
    Autorzy:
    Boczkal, G.
    Dadun, K.
    Palka, P.
    Hotlos, A.
    Janoska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355433.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microjoint
    thermocouple
    microstructure
    Opis:
    A method of using the electric charge in a capacitor was applied for the manufacture of thermocouple micro-joints. The motivation for the study was the need to produce a stable welded connection without affecting the geometry of the substrate, which was a thin sheet of Inconel 625 alloy (UNS designation N06625). Within the framework of the research work, a suitable workstation for micro-joints elaboration was built and welding experiments were performed using different electric charges. Studies carried out within the framework of the present work have shown that joints based on Inconel 625 alloy and platinum have the best application properties in the range of small-scale temperature measurements. They can be used, e.g., for monitoring the temperature distribution on the inner surfaces of electric motor casings. An undeniable advantage is in this case the high thermal resistance of both materials used to produce the joint, i.e. the Inconel 625 alloy and platinum. This allows them to be used at high temperatures under atmospheric conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 197-200
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Examinations in Corners of the Low-Carbon Steel Slabs from Continuos Caster Machine
    Autorzy:
    Kwinta, G.
    Kara, S.
    Kalandyk, B.
    Zapała, R.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351069.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    API 5L line pipe steels
    low-carbon micro alloyed steel
    microstructure
    non-metallic inclusion
    Opis:
    The exposed selvedge layers in slabs cast by the continuous process should be free from surface defects, which in most cases appear in the form of cracks on the casting surface and run to its interior. In addition to the parameters of the casting process, the occurrence of such defects depends on the chemical composition of cast steel, on the segregation of surface active elements and formation of the precipitates of carbides, nitrides and other phases. Due to the frequent occurrence of defects in corners of the slabs, non-destructive testing was performed on the mechanically cleaned surfaces of slabs. The test material was low-carbon API(American Petroleum Institute API 5L standard) steel micro alloyed with Nb and Ti designed for the production of pipes to handle gas, oil and other liquid and gaseous fuels. Despite the use of different methods of inspection, i.e. ultrasonic, magnetic particle and penetrant, cracks were not traced in the examined material. Then, from the corners of the examined slabs, specimens were cut out for metallographic examinations. The main purpose of these examinations was to disclose the presence of possible cracks and micro cracks on the surfaces transversal and longitudinal to the direction of casting. At the same time, studies were conducted to establish the number and morphology of non-metallic inclusions in selvedge layers of the slab corners and axis. Additionally, hardness of the slabs was measured. The conducted studies revealed only some minor differences in the slab hardness along its axis (130 ÷ 135 HB) and in selvedge layers (120 ÷ 123 HB).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2051-2056
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Wear Behaviour of Electrical Contacts Made from AgNi10 Composite
    Autorzy:
    Richert, M. W.
    Boczkal, G.
    Hotloś, A.
    Pałka, P.
    Karpiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355681.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear behaviour
    composite
    electrical contact
    surface degradation
    Opis:
    The effect of tribological wear of contacts made from an AgNi10 alloy on microstructure and electrical properties was investigated. The contacts were tested in duty cycles loaded with alternating current of 10A intensity. With this value of the current, intensive arcing of contacts occurred. The contacts were tested in the range of 125 to 500 thousand cycles. The contacting surfaces were reported to suffer a high degree of wear, but electrical resistance of the contact system remained stable.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2007-2013
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cooling Rate after Homogenization on the Microstructure and Properties of 2017a Alloy Billets for Extrusion with Solution Heat Treatment on the Press
    Autorzy:
    Woźnicki, A.
    Leśniak, D.
    Włoch, G.
    Pałka, P.
    Leszczyńska-Madej, B.
    Wojtyna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355500.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    2017A alloy
    cooling rate after homogenization
    θ (Al2Cu) phase particles precipitation
    Opis:
    The influence of cooling rate after homogenization on the 2017A alloy microstructure was analysed. The capability of the θ (Al2Cu) particles, precipitated during various homogenization coolings, for rapid dissolution was estimated. For this purpose, the DSC test was used to determine the effect of the cooling rate after homogenization on the course of melting during a rapid heating. Moreover, the samples after solution heat treatment (with short time annealing) and ageing, were subjected to the microstructure investigations and the microhardness of grains interiors measurements. It was found that cooling after homogenization at 160 °C/h is sufficient for precipitation of fine θ phase particles, which dissolve during the subsequent rapid heating. The cooling at 40 °C/h, causes the precipitation of θ phase in the form of large particles, incapable of further fast dissolution.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1663-1670
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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