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    Wyświetlanie 1-7 z 7
    Tytuł:
    Some Similarities / Differences between Steel Static and Virtual Brass Static Casting
    Autorzy:
    Kwapisiński, P.
    Ivanova, A. A.
    Kania, B.
    Wołczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382343.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    procesy odlewnicze
    modelowanie matematyczne
    FCCT
    wlewek mosiężny
    foundry processes
    mathematical modeling
    brass static ingot
    Opis:
    An innovative method for determining the structural zones in the large static steel ingots has been described. It is based on the mathematical interpretation of some functions obtained due to simulation of temperature field and thermal gradient field for solidifying massive ingot. The method is associated with the extrema of an analyzed function and with its points of inflection. Particularly, the CET transformation is predicted as a time-consuming transition from the columnar- into equiaxed structure. The equations dealing with heat transfer balance for the continuous casting are presented and used for the simulation of temperature field in the solidifying virtual static brass ingot. The developed method for the prediction of structural zones formation is applied to determine these zones in the solidifying brass static ingot. Some differences / similarities between structure formation during solidification of the steel static ingot and virtual brass static ingot are studied. The developed method allows to predict the following structural zones: fine columnar grains zone, (FC), columnar grains zone, (C), equiaxed grains zone, (E). The FCCT-transformation and CET-transformation are forecast as sharp transitions of the analyzed structures. Similarities between steel static ingot morphology and that predicted for the virtual brass static ingot are described.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 109-114
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Properties of Ni and Ni/Al2O3 Coatings Electrodeposited at Various Current Densities
    Autorzy:
    Góral, A.
    Berent, K.
    Nowak, M.
    Kania, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/958217.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni coating
    Ni/Al2O3 composite coatings
    microstructure
    corrosion resistance
    Opis:
    The study presents investigations of an influence of various direct current densities on microstructure, residual stresses, texture, microhardness and corrosion resistance of the nickel coatings electrodeposited from modified Watt’s baths. The properties of obtained coatings were compared to the nano-crystalline composite Ni/Al2O3 coatings prepared under the same plating conditions. The similarities and differences of the obtained coatings microstructures visible on both their surfaces and cross sections and determined properties were presented. The differences in the growth character of the Ni matrix and in the microstructural properties were observed. All electrodeposited Ni and Ni/Al2O3 coatings were compact and well adhering to the steel substrates. The thickness and the microhardness of the Ni and Ni/Al2O3 deposits increased significantly with the current density in the range 2 - 6 A/dm2. Residual stresses are tensile and they reduced as the current density increased. The composite coatings revealed better protection from the corrosion of steel substrate than pure nickel in solution 1 M NaCl.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 55-60
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utility Of Stress-Texture Characteristics Of Structural Materials By X-Ray Technique
    Przydatność charakterystyki naprężenie-tekstura materiałów strukturalnych wyznaczonej metodą rentgenowską
    Autorzy:
    Bonarski, J. T.
    Kania, B.
    Bolanowski, K.
    Karolczuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351860.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    residual stresses
    crystallographic texture
    state of microstructure
    naprężenia resztkowe
    tekstura krystalograficzna
    stan mikrostruktury
    Opis:
    The article presents the results of residual stress analysis in selected metal-metal joints manufactured by conventional welding and explosive merging. The X-ray diffraction technique applied for advanced stress-texture measurements and data processing revealed directions and values of the principal stresses and their configuration on the surface of the examined structural elements. The obtained stress topography of the joint intersections indicates a possible path of potential cracking formed during the exploitation process and thus it becomes a very useful tool in the diagnostics of structural elements.
    W pracy opisano badania i uzyskane wyniki analizy naprężeń własnych przeprowadzone dla wybranych połączeń metal-metal wytworzonych przez konwencjonalne spawanie oraz łączenie wybuchowe. Pomiary naprężeń oraz tekstury dokonane techniką dyfrakcji rentgenowskiej, jak i zastosowane odpowiednie procedury obliczeniowe pozwoliły zidentyfikować kierunki i wartości naprężeń głównych oraz ich konfigurację w badanych elementach konstrukcyjnych. Topografia naprężeń w wybranych obszarach badanych połączeń wskazuje możliwą drogę potencjalnej destrukcji złączy w procesie ich eksploatacji. Charakterystyki naprężeniowo-teksturowe uzyskane w oparciu o technikę dyfrakcji rentgenowskiej okazują się bardzo przydatnym narzędziem w diagnostyce elementów konstrukcyjnych, szczególnie takich jak przedmiotowe złącza.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2247-2252
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical and Numerical Modeling of Duplex Cast Steel Thin-Walled Castings
    Autorzy:
    Stradomski, G.
    Nadolski, M.
    Zyska, A.
    Kania, B.
    Rydz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/351674.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex cast steel
    centrifugal casting
    gravity casting
    thin-walled castings
    Opis:
    The paper, which is a summary and supplement of previous works and research, presents the results of numerical and physical modeling of the GX2CrNiMoCuN25-6-3 duplex cast steel thin-walled castings production. To obtain thin-walled castings with wall in the thinnest place even below 1 mm was used the centrifugal casting technology and gravity casting. The analyzed technology (centrifugal casting) enables making elements with high surface quality with reduced consumption of batch materials and, as a result, reducing the costs of making a unitary casting. The idea behind the production of cast steel with the use of centrifugal technology was to find a remedy for the problems associated with unsatisfactory castability of the tested alloy. The technological evaluation of the cast construction was carried out using the Nova Flow & Solid CV 4.3r8 software. Numerical simulations of crystallization and cooling were carried out for a casting without a gating system and sinkhead located in a mold in accordance with the pouring position. It was assumed that the analyzed cast will be made in the sand form with dimensions 250×250×120 mm.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1449-1456
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Model for Solidification Zones Selection in the Large Ingots
    Autorzy:
    Wołczyński, W.
    Kwapisiński, P.
    Kania, B.
    Wajda, W.
    Skuza, W.
    Bydałek, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/379882.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    thermal gradient field
    constrained solidification
    unconstrained solidification
    teoria krystalizacji
    gradientowe pole temperatury
    krzepnięcie ograniczone
    Opis:
    A vertical cut at the mid-depth of the 15-ton forging steel ingot has been performed by curtesy of the CELSA – Huta Ostrowiec plant. Some metallographic studies were able to reveal not only the chilled undersized grains under the ingot surface but columnar grains and large equiaxed grains as well. Additionally, the structural zone within which the competition between columnar and equiaxed structure formation was confirmed by metallography study, was also revealed. Therefore, it seemed justified to reproduce some of the observed structural zones by means of numerical calculation of the temperature field. The formation of the chilled grains zone is the result of unconstrained rapid solidification and was not subject of simulation. Contrary to the equiaxed structure formation, the columnar structure or columnar branched structure formation occurs under steep thermal gradient. Thus, the performed simulation is able to separate both discussed structural zones and indicate their localization along the ingot radius as well as their appearance in term of solidification time.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 87-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel
    Autorzy:
    Zieliński, A.
    Dobrzański, L.
    Purzyńska, H.
    Sikora, R.
    Dziuba-Kałuża, M.
    Kania, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/353717.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    creep test
    HR6W alloy
    Sanicro 25 steel
    microstructure
    Opis:
    This article presents the results of investigations on HR6W alloy and Sanicro 25 steel and the dissimilar welded joint made of them. The characteristic images of microstructure of the investigated materials in the as-received condition and following the creep test, observed with a scanning electron microscope (SEM), are shown. The X-ray analysis of phase composition of the existing precipitates was carried out. The method for evaluation of creep strength based on abridged creep tests carried out at a temperature higher than the design one is presented. The obtained results do not deviate from the values of creep strength determined in long-term creep tests. The maximum difference in creep strength of the investigated materials is ±20%, which is in compliance with the acceptable scatter band. The methodology presented can be used for verification of creep strength (life time) of the material of finished components to be operated under creep conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2057-2064
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current Advances in Information Quantum Technologies : Critical Issues
    Autorzy:
    Nałęcz-Charkiewicz, Katarzyna
    Meles, Jana
    Rzęsa, Wioleta
    Wojciechowski, Andrzej A.
    Warchulski, Eryk
    Kania, Kacper
    Stypułkowska, Justyna
    Fluder, Grzegorz
    Romaniuk, Ryszard S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844491.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information quantum technologies
    quantum sensors and timing
    quantum computing applications
    quantum genetic algorithms
    quantum communications and internet
    Opis:
    This article reviews chosen topics related to the development of Information Quantum Technologies in the major areas of measurements, communications, and computing. These fields start to build their ecosystems which in the future will probably coalesce into a homogeneous quantum information layer consisting of such interconnected components as quantum internet, full size quantum computers with efficient error corrections and ultrasensitive quantum metrology nodes stationary and mobile. Today, however, the skepticism expressing many doubts about the realizability of this optimistic view fights with a cheap optimism pouring out of some popular press releases. Where is the truth? Financing of the IQT by key players in research, development and markets substantially strengthens the optimistic side. Keeping the bright side with some reservations, we concentrate on showing the FAST pace of IQT developments in such areas as biological sciences, quantum evolutionary computations, quantum internet and some of its components.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 497-505
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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