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    Wyświetlanie 1-4 z 4
    Tytuł:
    The deviation from eutectic composition in boundary layer for eutectic growth: a phase-field study
    Autorzy:
    Tu, Zhixin
    Zhou, Jianxin
    Yin, Yajun
    Ji, Xiaoyuan
    Shen, Xu
    Powiązania:
    https://bibliotekanauki.pl/articles/355773.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phase field
    eutectic growth
    solidification
    composition deviation
    Opis:
    In this paper, the deviation from eutectic composition in boundary layer for eutectic growth is studied by phase-field method. According to a series of artificial phase diagram, the lamellar eutectic growth of these alloy is simulated during directional solidification. At steady state, average growth velocity of eutectic lamella is equal to the pulling velocity. With the increasing of the liquidus slope of β phase, the average composition in boundary layer would deviate from eutectic composition and the deviation increases. The constitutional undercooling difference between both solid phases caused by the deviation increases with the increasing of the deviation. The β phase would develop a depression under the influence of the deviation.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 119-123
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Influence of Process Parameters on Shape Deviation after Wire Electrical Discharge Machining
    Autorzy:
    Świercz, R.
    Oniszczuk-Świercz, D.
    Zawora, J.
    Marczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355430.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wire electrical discharge machining
    WEDM
    shape deviation
    CFD
    Opis:
    New materials require the use of advanced technology in manufacturing parts of complex shape. One of the modern non-conventional technology of manufacturing difficult to cut materials is the wire electrical discharge machining (WEDM). The article presents the results of theoretical and experimental research in the influence of the WEDM conditions and parameters on the shape deviation during a rough cut. A numerical model of the dielectric flow in the gap (ANSYS) was developed. The influence of the dielectric velocity field in the gap on the debris evacuation and stability of WEDM process was discussed. Furthermore, response surface methodology (RSM) was used to build empirical models for influence of the wire speed Vd, wire tension force Fn, the volume flow rate of the dielectric Qv on the flatness deviation after the WEDM.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1457-1462
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Twinned Dendrites of Al-Zn Alloy with High Zn Content
    Autorzy:
    Gao, K.
    Song, W.
    Fan, L.
    Ding, Y.
    Guo, X.
    Zhang, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351396.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    twinned dendrite
    microstructure
    growth orientation
    deviation angle
    Opis:
    Twinned dendrites in Al-Zn alloy with high Zn content (40% wt.%) were successfully prepared by directional solidification. At different directional solidification rates (1000 and 1500 μm/s), microstructures and growth orientation variations of Al twinned dendrite and non-twinned dendrite were characterized. By using the inverted trapezoidal graphite sleeve at 1000 μm/s, Al twinned dendrite were formed to developed feather crystal structures in longitudinal section. Its primary and secondary twinned dendrite were grew along [110] direction. Moreover the deviation angle between [110] direction of Al twinned dendrite and the heat flow direction was about 27.15°. While not using the inverted trapezoidal graphite sleeve at 1000 and 1500 μm/s, Al dendrite was the non-twinned dendrite and the twinned dendrite was not appeared. The experimental results showed that the higher temperature gradient, a certain pulling rate and convection environment were the formation conditions of twinned dendrites.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1657-1662
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigations of Tool Wear in Vibration-Assisted Turning of Inconel 718
    Autorzy:
    Dodla, Srihari
    Powiązania:
    https://bibliotekanauki.pl/articles/2125542.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Inconel 718
    ultrasonic assisted turning
    dry machining
    deviation
    cutting forces
    temperature
    Opis:
    In the current paper, the effect of tool wear for a constant period of time (360 s) during conventional and ultrasonic assisted machining of Inconel 718 is investigated in terms of cutting forces, temperature, and deviation measurements. For fixed process parameters turning experiments have been performed with and without the application of tangential vibration. Ultrasonic assisted turning (UAT) experiments have been compared with conventional turning (CT). The experimental results reveal that cutting forces and temperature increase linearly in the case of UAT whereas remaining constant in CT for a constant period of time. Besides the tool wear rate in the case of UAT is more than that in the CT.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 949--953
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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