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Wyszukujesz frazę "Romanowski, L." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Eutectoid Reaction Ar1 of Cast Iron GJS-400-15 in Isothermal Conditions
    Autorzy:
    Szykowny, T.
    Romanowski, Ł.
    Giętka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    spheroidal cast iron
    eutectoid reaction
    austenitizing temperature
    kinetics of eutectoid reaction
    obróbka cieplna
    żeliwo sferoidalne
    reakcja eutektoidalna
    Opis:
    This scientific paper presents the research on influence of austenitizing temperature on kinetics and evolution of the spheroidal plain cast iron during eutectoid reaction in isothermal conditions. The cast iron has been austenitized in temperatures of 900, 960 or 1020°C. Therewere two temperature values of isothermal holding taken into consideration: 760 or 820°C. The order of creation of reaction products and their morphology have been analyzed. The particular attention has been paid to the initial stage of transformation. The qualitative research has been executed using the transmission electron microscope (TEM), as well as quantitative research (LM). The influence of austenitizing temperature has also been determined on transformation kinetics and structural composition. It was found that the increase of austenitizing temperature is conductive to the initial release of structures by metastable system. A reduction of time was observed of the initial stage of transformation at temperature close to Ar12 with its simultaneous elongation at temperature close to Ar11, with an increase of austenitizing temperature. The dependences obtained by the metallographic method confirm the prior results of dilatometric research of eutectoid reaction.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3; 93-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Effects of Precipitation Hardening of Low-Alloy Copper-Nickel Spheroidal Cast Iron
    Autorzy:
    Szykowny, T.
    Giętka, T.
    Romanowski, Ł.
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382582.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    spheroidal cast iron
    low-alloy cast iron
    hardening
    obróbka cieplna
    żeliwo sferoidalne
    żeliwo niskostopowe
    hartowanie
    Opis:
    One type of spheroidal cast iron, with additions of 0.51% Cu and 0.72% Ni, was subjected to precipitation hardening. Assuming that the greatest increase in hardness after the shortest time of ageing is facilitated by chemical homogenisation and fragmentation of cast iron grain matrix, precipitation hardening after pre-normalisation was executed. Hardness (HB), microhardness (HV), qualitative and quantitative metalographic (LM, SEM) and X-ray structural (XRD) tests were performed. The acquired result of 13.2% increase in hardness after ca. 5-hour ageing of pre-normalised cast iron confirmed the assumption.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3; 87-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isothermal Transformation Ar1 Product Morphology and Kinetics of EN-GJS-600-3 Cast Iron
    Autorzy:
    Szykowny, T.
    Giętka, T.
    Ciechacki, K.
    Panfil, L.
    Romanowski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/381321.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spheroidal cast iron
    isothermal eutectoid reaction
    transformation kinetics
    żeliwo sferoidalne
    izotermiczna reakcja eutektoidalna
    kinetyka transformacji
    Opis:
    This work presents the qualitative and quantitative changes in the products of isothermal transformation (reaction) in a ductile cast iron austenite after supercooling to the temperature range Ar1. The austenitizing temperature considered in this work was 900, 960 or 1020°C. The eutectoid reaction was investigated by metallographic examination at a holding temperature right below Ar11 (820°C) or right below Ar12 (760°C). The quantitative metallographic examination was carried out with a light microscope (LM). The initial transformation stage products were identified with a transmission electron microscope (TEM). The selected samples were studied for chemical microsegregation of manganese, silicon, phosphorus, and carbon with an X-ray microanalyser (MAR). The tested cast iron material was found to predominantly feature a eutectoid reaction in the metastable system the ratio of which was increasing with the austenitizing temperature. The austenitizing temperature was found to be conducive to the evolution kinetics of individual phases and to the graphitization kinetics of the eutectoid cementite that was formed during the contemplated reaction.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 119-124
    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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