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    Wyświetlanie 1-13 z 13
    Tytuł:
    Directional solidification of ledeburite
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382901.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    ledeburite
    directional solidification
    structure
    interfacial distance
    proces krzepnięcia
    ledeburyt
    krzepnięcie kierunkowe
    struktura
    odległość międzyfazowa
    Opis:
    Directional solidification of ledeburite was realised out using a Bridgman’s device. The growth rate for movement sample v=83.3 μm/s was used. In one sample the solidification front was freezing. The value of temperature gradient in liquid at the solidification front was determined. Interfacial distance λ on the samples was measured with NIS-Elements application for image analysis.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 101-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Heat Treatment and Chemical Composition on the Structure and Mechanical Properties of Thick-walled Ductile Iron Castings
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/383320.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thick walled casting
    cast iron
    casting structure
    mechanical properties
    odlew grubościenny
    żeliwo
    struktura stopu
    właściwości mechaniczne
    Opis:
    In this work, the effects of 75 mm thick cast iron, (casting mould YIV) composition (Cu) and heat treatment were investigated on the microstructure and mechanical properties (hardness, elongation, tensile strength, yield strength) of ductile iron castings. As a result of adding Cu, the amount of pearlite is at 80% reduces of amount of ferrite. Normalizing of non-alloy cast iron increases the amount of pearlite to 70%. It also, increases tensile strength (659 MPa) and hardness (248 HB). Studied metallographic crossections were made from the grip sections of the tensile specimens. The structure composition and the characteristics of graphite were determined by computer image analysis. Measurements of graphite of non-alloy cast iron after normalizing and in cooper cast iron indicate the approximate amount of precipitates of graphite and their approximate average diameters. The applied normalizing and the additive alloy (Cu) were established to give comparable mechanical properties and structure of matrix in thick-walled castings.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 71-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled and competitive eutectic growth
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380538.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eutectic solidification
    competitive growth
    coupled growth
    krzepnięcie eutektyczne
    wzrost konkurencyjny
    wzrost sprzężony
    Opis:
    A description of the competitive growth is presented in the paper. The description is associated with the competition between eutectic structure and primary phase formation. A coupled zone for the eutectic solidification is drawn in the phase diagrams. The coupled zone is shown as a range of solute concentration versus under-cooling to justify the formation of the eutectic structure, exclusively. Interface growth temperatures of the single and coupled eutectic are illustrated schematically as a function of growth rates at a given composition Co.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 237-240
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leading Phase in the Directionally Solidifying Fe – 4.25%C Eutectic Alloy
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380702.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    eutectic alloy Fe-C
    solidification front
    leading phase
    krzepnięcie kierunkowe
    stop eutektyczny
    front krzepnięcia
    Opis:
    In order to determine the leading phase of the Fe - 4.25% C eutectic alloy, the method of directional crystallization, which allows to study the character of the solid / liquid growth front, was used. Examined eutectic was directionally solidified with a constant temperature gradient of G = 33,5 K/mm and growth rate of v = 125 μm/s (450 mm/h). The Bridgman technique was used for the solidification process. The sample was grown by pulling it downwards up to 30 mm in length. The alloy quenched by rapid pulling down into the Ga-In-Sn liquid metal. The sample was examined on the longitudinal section using a light microscope and scanning electron microscope. The shape of the solid/liquid interface and particularly the leading phase protrusion were revealed. The formation of the concave – convex interface has been identified in the quasi-regular eutectic growth arrested by quenching. The cementite phase was determined to be a leading phase. The total protrusion d is marked in the adequate figure.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRD and EBSD Measurements of Directional Solidification Fe-C Eutectic Alloy
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382146.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    X-ray diffraction
    EBSD technique
    carbide eutectic
    directional solidification
    dyfrakcja rentgenowska
    dyfrakcja elektronów wstecznie rozproszonych
    krzepnięcie kierunkowe
    Opis:
    In a vacuum Bridgman-type furnace, under an argon atmosphere, directionally solidified sample of Fe-C alloy was produced. The pulling rate was v = 83 μm/s (300 mm/h) and constant temperature gradient G = 33,5 K/mm. The microstructure of the sample was examined on the longitudinal section using an Optical Microscope and Scanning Electron Microscope. The X-ray diffraction and electron backscatter diffraction technique (EBSD) have been used for the crystallographic analysis of carbide particles in carbide eutectic. The X-ray diffraction was made parallel and perpendicular to the axis of the goniometer. The EBSD shows the existence of iron carbide Fe3C with orthorhombic and hexagonal structure. Rapid solidification may cause a deformation of the lattice plane which is indicated by different values of the lattice parameters. Such deformation could also be the result of directional solidification. Not all of the peaks in X–ray diffractograms were identified. They may come from other iron carbides. These unrecognized peaks may also be a result of the residual impurity of alloy.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 169-174
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of the materials properties improvement for the cementite eutectic by means of unidirectional solidification
    Możliwości poprawy własności użytkowych eutektyki cementytowej metodą krystalizacji zorientowanej
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355626.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ledeburite
    directional solidification
    eutectic
    structure
    interphase spacing
    kierunkowe krzepnięcie
    eutektyka
    struktura
    rozstaw
    Opis:
    The paper brings the results of directional solidification of Fe-Fe3C eutectic alloy. The Bridgman method with vertical thermal gradient in conducted research was applied. Two values of rate was used for sample movement testing. One sample after solidification, was immediately taken of the cooler. The distribution of thermal gradient in the alloy was determined. The value of thermal gradient in liquid at the solidification front was determined. On the samples, where cementite eutectic was oriented, interphase spacing λ was measured. The results of the dependence between parameters v and λ were presented. The research with application of optical microscope and computer programme to image analysis NIS-Elements was used.
    W pracy przedstawiono rezultaty kierunkowej krystalizacji stopu eutektycznego Fe-Fe3C. Wykorzystano metodę Bridgmana z pionowym gradientem temperatury. Zastosowano dwie prędkości przemieszczania próbki. Jedna z próbek, po zrealizowaniu krystalizacji została zamrożona. Określono rozkład gradientu temperatury w stopie oraz wyznaczono wartość gradientu temperatury w cieczy na froncie krystalizacji. Na próbkach przeprowadzono pomiary odległości międzyfazowej λ. Przedstawiono wyniki badań określających zależności pomiędzy parametrami v i λ. W badaniach wykorzystano mikroskop optyczny oraz program do komputerowej analizy obrazu NIS-Elements.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 987-991
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The criterion of minimum entropy production in eutectic growth
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382806.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zasada minimum produkcji entropii
    stop eutektyczny
    struktura warstwowa
    struktura prętowa
    minimum entropy production
    eutectic
    lamellar structure
    rod structure
    Opis:
    The paper presents adaptation problem of lamellar/rod growth of eutectic. The transformation of eutectic microstructure was investigated systematically. A interpretation of the eutectic growth with theory minimum entropy production was presented.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 85-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solidification of Ledeburite Eutectic
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379998.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ledeburite eutectic
    solidification
    kinetics
    ledeburyt
    krzepnięcie
    kinetyka
    Opis:
    The ledeburite eutectic is one from the most commercial eutectics of group the quasi-regular eutectics. The paper presents the knowledge of growth this eutectic. In the case high solidification, the foundation near which formulate the right growth eutectic they are fulfilled.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 71-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Microstructure of Oriented Eutectic Fe-C Alloy
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381607.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    eutectic alloy
    microstructure
    longitudinal section
    transverse section
    krzepnięcie
    stop eutektyczny
    mikrostruktura
    Opis:
    Fe - 4,25% C alloy was directionally solidified with a constant temperature gradient of G = 33,5 K/mm and growth rate of v = 83,3 μm/s (300 mm/h) using a vacuum Bridgman-type crystal growing facility with liquid metal cooling technique. To reveal more detailed microstructure, the deep etching was made. This was obtained in the process of electrolytic dissolution. The microstructure of the sample was examined on the longitudinal and transverse sections using an Optical Microscope and Scanning Electron Microscope. Using the Electron Backscattered Diffraction technique, phase map and analysis of phase were made. In this paper the analysis of Fe-C alloy eutectic microstructure is presented. Regular eutectic structure was obtained. The fracture surfaces show lamellar structure. Microscopic observation after electrolytic extraction indicates that the grains of longitudinal shape of eutectic cementite have been obtained. These grains are characterized by layered construction with many rounded discontinuities.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 123-128
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid-liquid interface morphology of white carbide eutectic during directional solidification
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354873.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solid-liquid interface
    directional solidification
    front solidification
    white carbide eutectic
    Opis:
    In this paper the analysis of solid-liquid interface morphology in white carbide eutectic was made. In a vacuum Bridgman-type furnace, under an argon atmosphere, directionally solidified sample of Fe - C alloy was produced. The pulling rate was v = 125 μm/s (450 mm/h) and constant temperature gradient G = 33.5 K/mm. The microstructure of the sample was frozen. The microstructure of the sample was examined on the longitudinal section using an light microscope and scanning electron microscope.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 365-368
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Diffraction Study of Directional Solidification Ledeburite
    Autorzy:
    Trepczyńska-Łent, M.
    Szykowny, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/379952.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    X-ray diffraction
    ledeburite eutectic
    directional solidification
    dyfrakcja rentgenowska
    ledeburyt
    krzepnięcie kierunkowe
    Opis:
    Directionally solidified sample of Fe-Fe3C eutectic alloy were produced under an argon atmosphere in a vacuum Bridgman-type furnace to study the eutectic growth with v = 167 μm/s pulling rate and constant temperature gradient G = 33.5 K/mm. Since how the growth texture of eutectic cementite is related to its growth morphology remains unclear, the current study aims to examine this relationship. The technique such as X-ray diffraction, have been used for the crystallographic analysis of carbide particles in white cast irons.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 71-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solidification Front of Oriented Ledeburite
    Autorzy:
    Trepczyńska-Łent, M.
    Olejnik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381823.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    ledeburite
    eutectic
    solid interface
    liquid interface
    leading phase
    krzepnięcie kierunkowe
    ledeburyt
    eutektyk
    Opis:
    Directional solidification of the Fe - 4,3 wt % C alloy was performed with the pulling rate equal to v=83 μm/s. Sample was frozen during solidification to reveal the shape of the solid/liquid interface. Structures eutectic pyramid and spherolitic eutectic were observed. The solidification front of ledeburite eutectic was revealed. The leading phase was identified and defined.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 124-130
    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
      Wyświetlanie 1-13 z 13

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