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    Wyświetlanie 1-2 z 2
    Tytuł:
    Effect of Cooling Rate on the Precipitation Characteristics of Cast Al-Si-Cu Alloy
    Autorzy:
    Okayasu, M.
    Sahara, N.
    Touda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079810.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    casting
    solid solution
    aging
    solidification rate
    precipitation
    stop aluminium
    odlew
    szybkość krzepnięcia
    Opis:
    The influence of the cooling rate on the extent of precipitation hardening of cast aluminum alloy (ADC12) was investigated experimentally. This study explored the cooling rate of the solidification of Cu in the α-Al phase to improve the mechanical properties of ADC12 after an aging process (Cu based precipitation hardening). The solid solution of Cu occurred in the α-Al phases during the casting process at cooling rates exceeding 0.03°C/s. This process was replaced with a solid solution process of T6 treatments. The extent of the solid solution varied depending on the cooling rate; with a higher cooling rate, a more extensive solid solution was formed. For the cast ADC12 alloy made at a high cooling rate, high precipitation hardening occurred after low-temperature heating (at 175°C for 20 h), which improved the mechanical properties of the cast Al alloys. However, the low-temperature heating at the higher temperature for a longer time decreased the hardness due to over aging.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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 1-2 z 2

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