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    National Tsing Hua University Institutional Repository > 工學院  > 材料科學工程學系 > 期刊論文 >  Correlation between acoustic emission signals and hydrogen permeation in high strength, low alloy steel cracking in wet H2S

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/52978

    Title: Correlation between acoustic emission signals and hydrogen permeation in high strength, low alloy steel cracking in wet H2S
    Authors: Tsai SY;Shih HC
    教師: 施漢章
    Date: 1998
    Publisher: Electrochemical Society
    Relation: JOURNAL OF THE ELECTROCHEMICAL SOCIETY,Volume: 145,Issue: 6,Pages: 1968-1976,Published: JUN 1998
    Abstract: Plates of high strength, low alloy (HSLA) steel (JIS-G-3115 SPV-50Q) were found to be susceptible to sulfide stress cracking and hydrogen-induced cracking (HIC) in wet H2S. The diffusion coefficient for the hydrogen atom in the SPV-50Q steel was determined at 25-60 degrees C and the activation energy for diffusion was 24.7 kJ/mol. The HSLA tensile specimens were immersed in the H2S-saturated NACE solution (0.5% acetic acid + 5% NaCl) at ambient temperature and their tensile properties were examined after hydrogen charging. The results suggest that the failure behavior is controlled by the barrier effect of the dense iron sulfide film on the steel surface and is not caused by the diffusion of hydrogen atoms in the steel. This suggestion is supported by the results of hydrogen permeation measurements, scanning electron microscopy examination, and acoustic emission (AE) tests. Results of potentiodynamic scans and hydrogen permeation tests indicate that the AE signals observed in the H2S environment may come from the formation or rupture of an iron sulfide film on the metal surface. The energy of AE signals in the H2S environment is much higher than that under cathodic charging. When HIC occurs in H2S-saturated NACE solution, AE energy values are often higher than 500 dB x mu s.
    URI: http://cat.inist.fr/?aModele=afficheN&cpsidt=2247209
    Appears in Collections:[材料科學工程學系] 期刊論文

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