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    Wyświetlanie 1-4 z 4
    Tytuł:
    In-situ Observation of High-Temperature Fracture Behaviour of 347 Stainless Steel Subjected to Simulated Welding Process
    Autorzy:
    Ko, Seok-Woo
    Park, Hyeonwoo
    Yoo, Il
    Kim, Hansoo
    Lee, Joonho
    Hwang, Byoungchul
    Powiązania:
    https://bibliotekanauki.pl/articles/2048885.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    347 stainless steel
    in-situ
    high temperature
    fracture behavior
    welding
    confocal laser scanning microscope
    CLSM
    Opis:
    In-situ study on the high-temperature fracture behaviour of 347 stainless steel was carried out by using a confocal laser scanning microscope (CLSM). The welding microstructures of the 347 stainless steel were simulated by subjecting the steel specimen to solution and aging treatments. Undissolved NbC carbides were present within grains after solution treatment, and M23C6 carbides were preferentially formed at grain boundaries after subsequent aging treatment. The M23C6 carbides formed at grain boundaries worked as stress concentration sites and thus generated larger cracks during high-temperature tensile testing. In addition, grain boundary embrittlement was found to be a dominant mechanism for the high-temperature fracture of the 347 stainless steel because vacancy diffusion in the Cr-depleted zones enhances intergranular fracture due to the precipitation of M23C6 carbides at grain boundaries.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1019-1022
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The prevalence and risk factors of musculoskeletal disorders in the hands of fishermen working as oyster shuckers
    Autorzy:
    Park, Jin Sung
    Yoo, Jun-Il
    Na, Jae-Bum
    Song, Han Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/2095509.pdf
    Data publikacji:
    2021-09-03
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    osteoarthritis
    fishermen
    musculoskeletal disorders
    wrist
    hands
    oyster shuckers
    Opis:
    ObjectivesThis study aimed to investigate the prevalence of musculoskeletal disorders in the hands and wrists of fishermen working as oyster shuckers, and to identify the risk factors associated with oyster shucking. Material and Methods A total of 590 fishery workers including those working as oyster shuckers in 2015–2017 were included in the study analysis. Hand osteoarthritis (OA), carpal tunnel syndrome (CTS), and ulnar impaction syndrome were diagnosed using X-ray, magnetic resonance imaging, and physical examinations according to each diagnostic criterion. The Rapid Entire Body Assessment was used as a measurement tool for analyzing the occupation-related burden factors.ResultsThe prevalence of hand OA, CTS, and ulnar impaction syndrome was higher in oyster shuckers than in aquaculture/offshore fishery workers. The prevalence of upper limb disease was higher in oyster shuckers than in other fishery workers, even in the prevalence of exposure to occupational burden factors. In oyster shuckers, the incidence of hand and wrist OA was 84%, that of CTS was 72%, and that of ulnar impaction syndrome was 41%. In addition, oyster shuckers were more likely to be exposed to occupational burden factors than were other types of fishermen. Conclusions The prevalence of hand OA, CTS, and ulnar impaction syndrome was higher in oyster shuckers. Therefore, proper stretching or exercises for rest and musculoskeletal relaxation, along with health-care education and promotion, will be needed for the fishermen’s repeated posture and impact work.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 5; 603-615
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of postglacial paleoproductivity in Long Lake, King George Island, West Antarctica
    Autorzy:
    Yoon, Ho-Il
    Khim, Boo-Keun
    Lee, Kyung
    Park, Yu-Hyeon
    Yoo, Kyu-Cheul
    Powiązania:
    https://bibliotekanauki.pl/articles/2051902.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    lake sediment
    paleoclimate
    diatoms
    organic carbon
    carbon isotopes
    Źródło:
    Polish Polar Research; 2006, 27, 3; 189-206
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Weldability of Hot-Dip Galvanized Steel by Anti-Galvanizing Coating with Si-Fe-Al Oxide-Based Micropowder
    Autorzy:
    So, Seong-Min
    Kim, Ki-Yeon
    Park, Il-Song
    Lee, Seok-Jae
    Yoo, Dong-Jin
    Kim, Yeon-Won
    Oh, Min-Suk
    Powiązania:
    https://bibliotekanauki.pl/articles/2203718.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot-dip galvanizing
    anti-galvanizing
    oxide micropowder
    weldability
    Opis:
    A Si-Fe-Al ternary oxide-based micropowder coating was used to prevent the formation of a Zn coating on steel during the hot-dip Zn galvanizing process to reduce the welding fume and defects generated during the welding of Zn-galvanized steel. The composition ratio of the oxide powder was optimized and its microstructure and weldability were evaluated. The optimized oxide coating was stable in the hot-dip galvanizing bath at 470°C and effectively inhibited the formation of Zn coating. The Zn residue could be easily removed with simple mechanical impact. The proposed coating reduced Zn fume and prevented the residual Zn from melting in the weld bead during high-temperature welding, thus reducing the number of welding defects. The results indicated that this pretreatment can simplify the manufacturing process and shorten the process time cost-effectively.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 155--159
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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