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    Wyświetlanie 1-3 z 3
    Tytuł:
    Structural analysis of iron based intermetallic phases in secondary AlSi6Cu4 cast alloy
    Autorzy:
    Svecova, I.
    Tillova, E.
    Kucharikova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/112033.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    iron based intermetallic phase
    vanadium
    aluminium alloy
    faza międzymetaliczna
    wanad
    stop aluminium
    Opis:
    The use of secondary aluminum alloys is increasing because it contributes to the decrease of production costs. However, these alloys contain bigger amount of iron. Iron has a negative effect and therefore its elimination is necessary in order to add some elements, which are also called correctors of iron. The most frequently used corrector is manganese. Another quite often used correctors are chromium, potassium, magnesium, vanadium. In the following work, vanadium is used as a corrector of iron phases. The application of vanadium in aluminum alloys has a positive impact on their mechanical properties, increases the tensile strength, ductility and hardness. As experimental material AlSi6Cu4 alloy was used. It was alloyed by master alloy AlFe10. After adding to the master alloy the iron content, the critical value in the alloy exceeded. Vanadium was added to AlSi6Cu4 alloy in different quantities. The image analysis (software NIS-Elements) was used for quantifying the amount of iron based intermetallic phases and determination of average values.
    Źródło:
    Production Engineering Archives; 2017, 15; 3-6
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of cooling rate on selected structural parameters of advanced cast Ni – base superalloys
    Autorzy:
    Belan, J.
    Vaško, A.
    Kuchariková, L.
    Švecová, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/114811.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base superalloys
    quantitative metallography methods
    cooling rate
    secondary dendrite arms spacing
    gamma prime evaluation
    carbide evaluation
    heat treatment
    superstopy na bazie niklu
    obróbka cieplna
    rozstaw ramion dendrytu
    rozmiar węglików
    rozkład węglików
    metody metalografii ilościowej
    Opis:
    The Ni – base superalloys are used in aircraft industry for production of aero engine most stressed parts, as are turbine blades or turbine discs. The most stressing factor at Ni – base superalloys loading or working conditions are high temperature range of 700°C up to 850°C and, of course, centrifugal forces, and small vibrations, which produce bending of turbine blades inserted into turbine discs. All these factors cause various forms of microstructure degradation closely connected with decreasing of mechanical properties and shortening of working life as well. From this reason a dendrite arm spacing, carbides size and distribution, morphology, number and value of γ’ - phase are very important structural characteristics for blade lifetime prediction as well as aero engine its self. In this article are used methods of quantitative metallography for evaluation of structural characteristics mentioned above on experimental materials – Ni base superalloys ŽS6K and Inconel IN 738. The high temperature effect represented here by heat treatment at 800°C for 10 hours, and cooling rate, here represented by three various cooling mediums as water, air, and oil, on structural characteristics and application of quantitative methods evaluation with using of SEM are presented in this paper.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 20-30
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Employing various metallography methods at high temperature alloy fatigue tests evaluation
    Autorzy:
    Belan, J.
    Kucharikova, L.
    Vasko, A.
    Chalupova, M.
    Svecova, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/111897.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base casting and wrought alloys
    gamma prime
    gamma double prime
    gamma solid solution
    light microscopy
    scanning electron microscopy
    SEM
    skaningowa mikroskopia elektronowa
    stopy do obróbki plastycznej
    mikrostruktury nadstopów
    stop
    odlew
    Opis:
    Microstructures of superalloys have dramatically changed throughout the years, as modern technology of its casting or forging has become more sophisticated. The first superalloys have polyedric microstructure consisting of gamma solid solution, some fraction of gamma prime and of course grain boundaries. As demands on higher performance of aero jet engine increases, the changes in superalloys micro-structure become more significant. A further step in microstructure evolution was directionally solidified alloys with columnar gamma prime particles. The latest microstructures are mostly monocrystalline, oriented in [001] direction of FCC gamma matrix. All microstructure changes bring necessity of proper preparation and evaluation of microstructure. Except for the already mentioned structures have gamma double prime and various carbides form can be seen. These structural parameters have mainly positive influence on important mechanical properties of superalloys. The paper deals with a microstructural evaluation of both groups of alloys – cast and as well as wrought. Micro-structure evaluation helps to describe mechanism at various loading and failure of progressive superalloys. Such an example where micro-structure evaluation is employed is fractography of failure surfaces after fatigue tests, which are examples of metallography evaluation de-scribed in this paper as a secondary objective.
    Źródło:
    Production Engineering Archives; 2016, 13, 4; 11-15
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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