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Wyszukujesz frazę "Oh, M. C." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Microstructural Characterization Of Laser Heat Treated AISI 4140 Steel With Improved Fatigue Behavior
    Charakterystyka mikrostruktury stali AISI 4140 po laserowej obróbce cieplnej i z poprawioną odpornością na zmęczenie
    Autorzy:
    Oh, M. C.
    Yeom, H.
    Jeon, Y.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355558.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser heat treatment
    vibration peening
    fatigue properties
    ultrasonic fatigue test
    alloy steel
    laserowa obróbka cieplna
    wibracje
    własności zmęczeniowe
    badanie ultradźwiękowe
    stal stopowa
    Opis:
    The influence of surface heat treatment using laser radiation on the fatigue strength and corresponding microstructural evolution of AISI 4140 alloy steel was investigated in this research. The AISI 4140 alloy steel was radiated by a diode laser to give surface temperatures in the range between 600 and 800°C, and subsequently underwent vibration peening. The fatigue behavior of surface-treated specimens was examined using a giga-cycle ultrasonic fatigue test, and it was compared with that of non-treated and only-peened specimens. Fatigue fractured surfaces and microstructural evolution with respect to the laser treatment temperatures were investigated using an optical microscope. Hardness distribution was measured using Vickers micro-hardness. Higher laser temperature resulted in higher fatigue strength, attributed to the phase transformation.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1331-1334
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    De-Lubrication Behavior Of Novel EBS Based Admixed Lubricant In Aluminum P/M Alloy
    Zachowanie nowego lubrykantu na bazie EBS w trakcie spiekania proszku stopu aluminium
    Autorzy:
    Oh, M. C.
    Seok, H.
    Kim, H. J.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/354258.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    admixed lubricant
    compaction pressure
    powder metallurgy
    sintering
    Al-Cu-Mg alloy
    lubrykant
    zagęszczanie
    metalurgia proszków
    spiekanie
    stop Al-Cu-Mg
    Opis:
    The objective of the present research is to develop a novel lubricant for Al-Cu-Mg P/M alloy and to address the effects of the lubricant and compaction pressure on sintered properties. A lubricant mixture consisting of Ethylene Bis Stearamide, Zn-Stearate, and fatty acid was newly developed in this study, and the de-lubrication behavior was compared with that of other commercial lubricants, such as Ethylene Bis Stearamide, Zn-Stearate, and Al-Stearate. Density and transverse rupture strength of sintered materials with each lubricant were examined, respectively. The microstructural analysis was conducted using optical microscope.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1427-1431
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
    Płynięcie stopu magnezu ZK60A podczas wysokotemperaturowego odkształcenia w trakcie wytłaczania
    Autorzy:
    Kawasaki, M.
    Lee, H. J.
    Oh, M. C.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/354374.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    activation energy
    extrusion
    flow mechanics
    magnesium alloy
    tensile property
    energia aktywacji
    wytłaczanie
    mechanika przepływu
    stop magnezu
    rozciąganie
    Opis:
    Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10-6 − 1.0×10-2 s-1 at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10-5 s-1 and strain rate sensitivity, m, of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1327-1330
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantitative Analysis of Cryomilled Nanocrystalline Ti-6Al-4V Alloy Powder by X-Ray Diffraction
    Autorzy:
    Oh, M.
    Yu, H. K.
    Lee, J.-H.
    Oh, M. C.
    Jung, S.-H.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/356265.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanocrystalline
    cryomilling
    Ti alloy
    X-ray diffraction
    size-strain plot method
    Opis:
    A nanocrystalline Ti alloy powder was fabricated using cryomilling. The grain size and lattice strain evolution during cryomilling were quantitatively analyzed using X-ray diffraction (XRD) based on the Scherrer equation, Williamson-Hall (W-H) plotting method, and size-strain (S-S) method assuming uniform deformation. Other physical parameters including stress and strain have been calculated. The average crystallite size and the lattice strain evaluated from XRD analysis are in good agreement with the result of transmission electron microscopy (TEM).
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1439-1442
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Xenoxylon synecology and palaeoclimatic implications for the Mesozoic of Eurasia
    Autorzy:
    Oh, C.
    Philippe, M.
    Kim, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/945484.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    fossil wood
    Xenoxylon
    phytocoenosis
    paleoecology
    paleoclimate
    Mesozoic
    Eurasia
    Opis:
    The distribution of fossil wood genera has been demonstrated to be an effective proxy for Mesozoic terrestrial climates. In this study, we investigated the phytocoenoses, which were associated with Xenoxylon confirmed to be a marker for a cool and/or wet climate in a boreal hemisphere (i.e., Xenoxylon-phytocoenoses) during the Mesozoic, using specimens of fossil wood. It was confirmed that Xenoxylon co-occurs more often with some wood genera than with others. For example, Protocedroxylon, a wood that is most likely related to the Pinaceae, is the genus most often associated with Xenoxylon-phytocoenoses. Although Taxodioxylon is also found in Xenoxylon-phytocoenoses, it is not found, however, as consistently as Protocedroxylon. The distribution and diversity of Xenoxylon-phytocoenoses changed throughout the Mesozoic. During the Late Triassic and Late Cretaceous, Xenoxylon-phytocoenoses had low diversity and were restricted to higher palaeolatitudes during the Late Cretaceous. However, during the Early to Middle Jurassic, Xenoxylon-phytocoenoses were distributed much farther south, while their diversity concomitantly increased sharply. From the Late Jurassic to the Early Cretaceous, the distribution of Xenoxylon phytocoenoses moved northward in Europe and even more so in East Asia. The changes in the distribution of Xenoxylon-phytocoenoses are in agreement with changes in both global and regional climates. Our results also demonstrated that, within the Xenoxylon distribution range, the corresponding phytocoenoses were differentiated along a latitudinal gradient and according to the global climate change patterns during the Mesozoic.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 1; 245-256
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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