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Wyszukujesz frazę "transformation of austenite" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Abrasive-wear Resistance of Austenitic Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380382.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasive wear
    austenitic cast iron
    heat treatment
    nickel equivalent
    transformation of austenite
    zużycie ścierne
    żeliwo austenityczne
    obróbka cieplna
    nikiel
    transformacja austenitu
    Opis:
    A research of wear resistance of an austenitic cast iron with higher resistance to abrasive-wear and maintained corrosion resistance characteristic for Ni-Resist cast iron is presented. For the examination, structure of raw castings was first formed by proper selection of chemical composition (to make machining possible). Next, a heat treatment was applied (annealing at 550 °C for 4 hours followed by air cooling) in order to increase abrasive-wear resistance. One of the factors deciding intensity of wear appeared to be the chilling degree of castings. However, with respect to unfavourable influence of chilling on machining properties, an important factor increasing abrasive-wear resistance is transformation of austenite to acicular ferrite as a result of annealing non-chilled castings. Heat treatment of non-chilled austenitic cast iron (EquNi > 16%) resulted in much higher abrasive-wear resistance in comparison to the alloy having pearlitic matrix at ambient temperature (EquNi 5.4÷6.8%).
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cr, Mo and Al on Structure and Selected Mechanical Properties of Austenitic Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383202.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic cast iron
    austenite transformation
    heat treatment
    cast
    mechanical properties of cast
    nickel equivalent
    żeliwo austenityczne
    zmiana właściwości
    obróbka cieplna
    odlew
    właściwości mechaniczne odlewu
    Opis:
    Results of a research on influence of chromium, molybdenum and aluminium on structure and selected mechanical properties of Ni-Mn- Cu cast iron in the as-cast and heat-treated conditions are presented. All raw castings showed austenitic matrix with relatively low hardness, making the material machinable. Additions of chromium and molybdenum resulted in higher inclination to hard spots. However, a small addition of aluminium slightly limited this tendency. Heat treatment consisting in soaking the castings at 500 °C for 4 h resulted in partial transformation of austenite to acicular, carbon-supersaturated ferrite, similar to the bainitic ferrite. A degree of this transformation depended not only on the nickel equivalent value (its lower value resulted in higher transformation degree), but also on concentrations of Cr and Mo (transformation degree increased with increasing total concentration of both elements). The castings with the highest hard spots degree showed the highest hardness, while hardness increase, caused by heat treatment, was the largest in the castings with the highest austenite transformation degree. Addition of Cr and Mo resulted in lower thermodynamic stability of austenite, so it appeared a favourable solution. For this reason, the castings containing the highest total amount of Cr and Mo with an addition of 0.4% Al (to reduce hard spots tendency) showed the highest tensile strength.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Soaking Parameters on the Segregation and Corrosion Resistance of GJS-X350NiMnCu7-3-2 Ductile Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380330.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    austenitic ductile iron
    transformation of austenite
    corrosion resistance
    segregation of elements
    obróbka cieplna
    żeliwo sferoidalne
    austenit
    odporność na korozję
    Opis:
    In this paper, the effect of changes the parameters of heat treatment on the structure and the degree of elements segregation was determined, in the context of corrosion resistance of ductile iron Ni-Mn-Cu, containing 7.2% Ni, 2.6% Mn and 2.4% Cu. In the condition after casting, castings of austenitic matrix and 160HBW hardness were obtained. The achieved castings were soaked at 450, 550 and 650°C for 4, 8 and 12 hours, then cooled down at the ambient air. In most cases, the heat treatment resulted in a change in the castings matrix, had the consequence of increasing their hardness in comparison to raw castings. Increasing the temperature and prolonging soaking time resulted in increasing the degree of transformation of austenite, while reducing the degree of elements segregation. This led to the formation of slightly bigger number of pitting due to corrosion, but not so deep and more evenly distributed in comparison to raw castings. Wherein the results of corrosion tests show that heat treatment of castings did not significantly change their corrosion resistance in comparison to raw castings, in contrast to the significant increase in mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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