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    Wyświetlanie 1-12 z 12
    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:
    Assessment of Mechanism of Pore Formation in Directionally Solidified A356 Alloy
    Autorzy:
    Uludag, M.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380892.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krzepnięcie kierunkowe
    porowatość
    ziarna
    odlewy
    directional solidification
    porosity
    bifilm index
    grain refinement
    casting
    Opis:
    It is well-known that the better the control of the liquid aluminium allows obtaining of better properties. One of the most important defects that is held responsible for lower properties has been the presence of porosity. Porosity has always been associated with the amount of dissolved hydrogen in the liquid. However, it was shown that hydrogen was not the major source but only a contributor the porosity. The most important defect that causes porosity is the presence of bifilms. These defects are surface entrained mainly due to turbulence and uncontrolled melt transfer. In this work, a cylindrical mould was designed (Ø30 x 300 mm) both from sand and die. Moulds were produced both from sand and die. Water cooled copper chill was placed at the bottom of the mould in order to generate a directional solidification. After the melt was prepared, prior to casting of the DC cast samples, reduced pressure test sample was taken to measure the melt quality (i.e. bifilm index). The cast parts were then sectioned into regions and longitudinal and transverse areas were investigated metallographically. Pore size, shape and distribution was measured by image analysis. The formation of porosity was evaluated by means of bifilm content, size and distribution in A356 alloy.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 157-162
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Directional Solidification of AlSi Alloys with Fe Intermetallic Phases
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/379990.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    aluminum alloys
    calibration
    intermetallic phases
    krzepnięcie kierunkowe
    stopy aluminium
    kalibracja
    fazy międzymetaliczne
    Opis:
    Directional solidification technique is an important research instrument to study solidification of metals and alloys. In the paper the model [6,7,8] of directional solidification in special Artemis-3 facility was presented. The current work aimed to propose the ease and efficient way in calibrating the facility. The introduced M coefficient allowed effective calibration and implementation of defined thermal conditions. The specimens of AlSi alloys with Fe-rich intermetallics and especially deleterious β-Al5FeSi were processed by controlled solidification velocity, temperature gradient and cooling rate.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 75-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Contact Gap in Directional Solidification of AlSiFe Alloys
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/381310.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    aluminium alloys
    calibration
    intermetallic phases
    krzepnięcie kierunkowe
    stop aluminium
    kalibracja
    faza międzymetaliczna
    Opis:
    One of the methods to study solidification of alloys and metals is directional solidification. In the paper the effect of the contact gap between the analyzed specimen and the bottom heater was analysed. The occurring contact gap caused the increase in planned solidification velocity. For the facility calibration the methodology with M coefficient was applied. The experiments revealed efficient values of M and allowed to conduct efficiently the directional solidification of AlSiFe alloys in wide range of growth rates. The effect of the contact gap seems to be random phenomena and most difficult factor influencing precisely planned directional solidification.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 41-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowy sposób wytwarzania odlewów precyzyjnych ze stopu miedzi w formach ceramicznych
    Autorzy:
    Czekaj, E.
    Karwiński, A.
    Pączek, Z.
    Pysz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381360.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewanie precyzyjne
    stop miedzi
    formy ceramiczne
    krzepnięcie kierunkowe
    precision casting
    copper alloy
    ceramic forms
    Opis:
    W publikacji zaprezentowano wyniki badań odlewów wytwarzanych ze stopu miedzi (brązu aluminiowego, typu BA1044) według opracowanej w Instytucie Odlewnictwa w Krakowie technologii wykonywania odlewów precyzyjnych przy zastosowaniu kierunkowego krzepnięcia [9]. Wstępnie pokazano zasadność nowoopracowanego w Polsce sposobu wytwarzania skomplikowanych konstrukcyjnie, a zarazem wysokojakościowych (z uwagi na właściwości użytkowe) części maszyn, urządzeń i pojazdów ze stopów miedzi. Proponowane rozwiązanie jest innowacją nie tylko w skali kraju (Polski), ale również o zasięgu międzynarodowym.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 9-16
    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:
    Anisotropic in Situ Metal Matrix Composite Reinforced with VC Carbide Fibres
    Autorzy:
    Kawalec, M.
    Górny, M.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/381579.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast composite
    directional solidification
    vanadium eutectic
    vanadium carbide
    microstructure
    kompozyt odlewany
    krzepnięcie kierunkowe
    węglik wanadu
    Opis:
    A eutectic reaction is a basic liquid-solid transformation, which can be used in the fabrication of high-strength in situ composites. In this study an attempt was made to ensure directional solidification of Fe-C-V alloy with hypereutectic microstructure. In this alloy, the crystallisation of regular fibrous eutectic and primary carbides with the shape of non-faceted dendrites takes place. According to the data given in technical literature, this type of eutectic is suitable for the fabrication of in-situ composites, owing to the fact that a flat solidification front is formed accompanied by the presence of two phases, where one of the phases can crystallise in the form of elongated fibres. In the present study an attempt was also made to produce directionally solidifying vanadium eutectic using an apparatus with a very high temperature gradient amounting to 380 W/cm at a rate of 3 mm/h. Alloy microstructure was examined in both the initial state and after directional solidification. It was demonstrated that the resulting microstructure is of a non-homogeneous character, and the process of directional solidification leads to an oriented arrangement of both the eutectic fibres and primary carbides.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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:
    Modelling the composition of carbides in nickel-based superalloys of directional crystallization
    Autorzy:
    Glotka, O. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818827.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    nickel-based superalloys
    directional solidification
    alloying system
    CALPHAD method
    structure
    composition of carbides
    nadstopy niklu
    krzepnięcie kierunkowe
    metoda CALPHAD
    struktura
    węgliki
    Opis:
    Purpose: The specifics of the influence of alloying elements on the chemical composition of various types of carbides, their topology and morphology for a multicomponent system of the type Ni-5Cr-9Co-6Al-1Ti-11.7W-1.1Mo-1.6Nb-0.15C using the calculation method CALPHAD. It is shown that the obtained dependences closely correlate with thermodynamic processes occurring in the system. Design/methodology/approach: This work presents the results of studies of the distribution of chemical elements in the composition of carbides, depending on their content in the system. Findings: It was found that the influence of alloying elements on the composition of carbides is complex and is described by complex. Research limitations/implications: An essential problem is the prediction of the structure and properties of heat-resistant alloys without or with a minimum number of experiments. Practical implications: The obtained dependences can be used both for designing new heat-resistant alloys and for improving the compositions of industrial alloys. Originality/value: The value of this work is that the obtained dependences of the influence of alloying elements on the dissolution (precipitation) temperatures and the distribution of elements in carbides in the alloy of the Ni-5Cr-9Co-6Al-1Ti-11.7W-1.1Mo-1.6Nb-0.15C.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 102, 1; 5--15
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Assessment of Mushy Zone in Directional Solidification
    Autorzy:
    Mikołajczak, P.
    Ratke, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/380005.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    directional solidification
    mushy zone
    CALPHAD technique
    Fe intermetallics
    β-Al5FeSi
    stop aluminium
    krzepnięcie kierunkowe
    strefa półciekła
    technika CALPHAD
    Opis:
    Solidification of AlSiFe alloys was studied using a directional solidification facility and the CALPHAD technique was applied to calculate phase diagrams and to predict occurring phases. The specimens solidified by electromagnetic stirring showed segregation across, and the measured chemical compositions were transferred into phase diagrams. The ternary phase diagrams presented different solidification paths caused by segregation in each selected specimen. The property diagrams showed modification in the sequence and precipitation temperature of the phases. It is proposed in the study to use thermodynamic calculations with Thermo-Calc which enables us to visualize the mushy zone in directional solidification. 2D maps based on property diagrams show a mushy zone with a liquid channel in the AlSi7Fe1.0 specimen center, where significant mass fraction (33%) of β-Al5FeSi phases may precipitate before α-Al dendrites form. Otherwise liquid channel occurred almost empty of β in AlSi7Fe0.5 specimen and completely without β in AlSi9Fe0.2. The property diagrams revealed also possible formation of α–Al8Fe2Si phases.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 101-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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