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    Wyświetlanie 1-6 z 6
    Tytuł:
    Nowoczesne materiały kompozytowe zastępujące tradycyjne materiały odlewnicze
    Modern composites to replace traditional casting materials
    Autorzy:
    Mierzwa, P.
    Olejnik, E.
    Janas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381945.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MMCs
    kompozyt in situ
    materiał odlewniczy
    odporność na ścieranie
    staliwo Hadfielda
    węglik tytanu
    in situ composite
    casting material
    abrasion resistant
    cast manganese steel
    titanium carbide
    Hadfield cast steel
    Opis:
    W pracy przedstawiono możliwość przekształcenia klasycznych materiałów odlewniczych w kompozyty in situ. Materiały te znajdują coraz szersze zastosowanie w różnych gałęziach przemysłu, a szczególnie w przemyśle wydobywczym. Przekształcenie stopu klasycznego w materiał kompozytowy, wpływa wyraźnie na poprawę jego właściwości mechanicznych. W wyniku przeprowadzonych badań uzyskano nowy materiał inżynierski, który wytworzono metodą syntezy objętościowej z wykorzystaniem reakcji SHSB. Zastosowana metoda pozwala umocnić klasyczne materiały odlewnicze zarówno lokalnie, jak również objętościowo. Umocnienie to polega na syntezie cząstek ceramicznych w kąpieli metalowej, bezpośrednio w jednoetapowym procesie odlewniczym. Materiałem wyjściowym do badań było staliwo manganowe, które w wyniku przeprowadzonej reakcji syntezy, przekształcono w kompozyt typu MMCs. Fazą wzmacniającą nowego materiału były ceramiczne cząstki węglika tytanu. Prezentowane w niniejszej pracy wyniki, wskazują na znaczną poprawę zarówno właściwości mechanicznych, jak i użytkowych otrzymanego materiału kompozytowego, dotyczy to takich parametrów, jak twardości i odporności na ścieranie.
    The study presents an opportunity to transform the traditional casting materials into in situ composites, the latter ones being currently used on a growing scale in various sectors of the industry, especially in the extractive industries. The transformation of standard alloy into a composite considerably improves the mechanical properties. As a result of the experiment, a new engineering material was produced by the method of bulk synthesis and an SHSB reaction. The method enables hardening of the traditional casting materials, both locally and in the whole volume of the material. The hardening is obtained by the synthesis of ceramic particles in a metal bath, directly in a one-step casting process. The starting material for research was cast manganese steel which, as a result of the reaction of synthesis, was converted into an MMCs type composite. The reinforcing phase in the new material were ceramic particles of titanium carbide. The results presented in this paper show a significant improvement in both mechanical and performance properties of the composite material obtained, this also applying to parameters such as hardness and abrasive wear resistance.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 137-142
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Characteristic of TiC-Reinforced Cast Steel after GTAW Remelting
    Autorzy:
    Sobula, S.
    Kwiecień, A.
    Olejnik, E.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380286.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite steel casting
    TiC
    reinforced cast steel
    GTAW surface remelting
    odlew staliwny
    odlew kompozytowy
    metoda GTAW
    utwardzanie powierzchniowe
    Opis:
    In this study, low-carbon cast steel was reinforced with TiC by SHS-B method, also known as combustion synthesis during casting method. The composite zone was then subjected to surface remelting by Gas Tungsten Arc Welding (GTAW) method. The remelting operation was realized manually, at 150 A current magnitude. Microstructure, phase composition and hardness of remelted zone were investigated. XRD results reveal that the phases of the composite zone in initial state consist of TiC and Feα. Surface remelting resulted in formation of thick layers containing TiC carbides, Feα and Feγ. Microstructural examination has shown strong refinement of titanium carbides in remelted zone and complete dissolution of primary titanium carbides synthetized during casting. The average diameter of carbides was below 2 μm. The structural changes are induced by fast cooling which affects crystallization rate. The hardness (HV30) of the remelted layer was in the range between 250 HV and 425 HV, and was lower than hardness in initial state.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 151-154
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Transformations Versus Hard Particles Motion in the Brass Ingots
    Autorzy:
    Wołczyński, W.
    Ivanova, A. A.
    Kwapisiński, P.
    Olejnik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355047.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    continuously cast ingot
    mathematical forecast of structural zones
    hard particles in the brass
    Opis:
    A mathematical method for the forecast of the type of structure in the steel static ingot has been recently developed. Currently, the method has been applied to structural zones prediction in the brass ingots obtained by the continuous casting. Both the temperature field and thermal gradient field have been calculated in order to predict mathematically the existence of some structural zones in the solidifying brass ingot. Particularly, the velocity of the liquidus isotherm movement and thermal gradient behavior versus solidification time have been considered. The analysis of the mentioned velocity allows the conclusion that the brass ingots can evince: chilled columnar grains-, (CC), fine columnar grains-, (FC), columnar grains-, (C), equiaxed grains zone, (E), and even the single crystal, (SC), situated axially. The role of the mentioned morphologies is analyzed to decide whether the hard particles existing in the brass ingots can be swallowed or rejected by the solid / liquid (s/l) interface of a given type of the growing grains. It is suggested that the columnar grains push the hard particles to the end of a brass ingot during its continuous casting.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2461-2467
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardness and Wear Resistance of TiC-Fe-Cr Locally Reinforcement Produced in Cast Steel
    Autorzy:
    Olejnik, E.
    Szymański, Ł.
    Kurtyka, P.
    Tokarski, T.
    Grabowska, B.
    Czapla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/947363.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reinforcement
    castings
    hardness
    wear resistance
    in situ TiC
    ball-on-disk
    zbrojenie
    odlew
    twardość
    odporność na ścieranie
    Opis:
    In order to increase wear resistance cast steel casting the TiC-Fe-Cr type composite zones were fabricated. These zones were obtained by means of in situ synthesis of substrates of the reaction TiC with a moderator of a chemical composition of white cast iron with nickel of the Ni-Hard type 4. The synthesis was carried out directly in the mould cavity. The moderator was applied to control the reactive infiltration occurring during the TiC synthesis. The microstructure of composite zones was investigated by electron scanning microscopy, using the backscattered electron mode. The structure of composite zones was verified by the X-ray diffraction method. The hardness of composite zones, cast steel base alloy and the reference samples such as white chromium cast iron with 14 % Cr and 20 % Cr, manganese cast steel 18 % Mn was measured by Vickers test. The wear resistance of the composite zone and the reference samples examined by ball-on-disc wear test. Dimensionally stable composite zones were obtained containing submicron sizes TiC particles uniformly distributed in the matrix. The macro and microstructure of the composite zone ensured three times hardness increase in comparison to the cast steel base alloy and one and a half times increase in comparison to the white chromium cast iron 20 % Cr. Finally ball-on-disc wear rate of the composite zone was five times lower than chromium white cast iron containing 20 % Cr.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings
    Autorzy:
    Sobula, S.
    Olejnik, E.
    Kurtyka, P.
    Szymański, Ł.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/355914.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear resistance
    composite casting
    TiC reinforced cast steel
    metal matrix composites
    Opis:
    Wear resistance of TiC-ZrO2-Fe locally reinforced steel casting has been investigated. Composites were obtained by introducing to mould cavity compact with TiC reaction substrates, ZrO2 particles and addition of moderator. Casting with local reinforcement – composite zone was obtained. Structure and microstructure of composite zone were investigated with use of X-ray diffraction (XRD) and scanning electron microscope (SEM) methods. The Miller slurry machine and Ball-on-Disc tester were used to determine wear resistance of the fabricated locally reinforced TiC-ZrO2-Fe composites. The worn surface of specimens after test, was studied by SEM. Due to the presence of TiC and ZrO2 particles in composite zone steel castings exhibited higher abrasion resistance than chromium white cast iron with Ni addition Ni-Hard 1 type and comparable with composites with high TiC content.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 119-124
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Locally Reinforcement TiC-Fe Type Produced in Situ in Castings
    Autorzy:
    Olejnik, E.
    Szymański, Ł.
    Kurtyka, P.
    Tokarski, T.
    Maziarz, W
    Grabowska, B.
    Czapla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380995.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MMCs
    reinforcement
    TiC
    in situ
    hardness
    ball-on-disc
    zbrojenie
    twardość
    Opis:
    Refinement is one of the most energy consuming technological process, aimed at obtaining mineral raw materials of the proper grain size. Cast structural elements such as jaws or hammers in crushing machines operate under conditions of an intensive wear. The data indicate that 80% of failures of machines and devices is caused by wearing of rubbing surfaces. This problem became the subject of several scientific and industrial investigations carried out in the whole world in order to produce materials ultra- wear resistant. Methods allowing to obtain wear resistant composite castings are discussed in the hereby paper. Within the performed research microstructures of the produced composite zones were presented and the comparative analysis with regard to mechanical and functional properties of local composite reinforcements in relation to the commercial alloys of increased wear resistance was performed. The results show almost twenty five times increase in wear resistance compared to manganese cast steel containing 18% Mn.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 77-82
    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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