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<p>The influence of the surface layer with nanocrystalline structure (NCS), electrolytical hydrogen charging of different intensities, and their complex action on the velocity of surface acoustic waves (SAW) on the 40Kh steel is studied. Changes in the NCS parameters under hydrogen action were revealed. The distribution of properties through the surface layer thickness using SAW with frequencies of 1, 3, and 6 MHz is estimated. A&#xa0;decrease in the SAW velocity is shown for the layer with NCS versus the matrix metal, as well as for the hydrogen-charged metal versus the non-hydrogen-charged one. A&#xa0;non-monotonic dependence of the change in SAW velocity on the hydrogen charging intensity of the steel is established. The dependence of the SAW velocity on the frequency for the hydrogen-charged steel, thus indicating a&#xa0;non-homogeneous distribution of changes in properties through the depth, is observed. The surface NCS layer is a&#xa0;barrier for the hydrogen penetration into the steel depth under hydrogen charging at <i>i</i><i>c</i> = 0.1 mA/cm<sup>2</sup>.</p>

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The influence of hydrogen charging on surface acoustic waves propagation in structural steel with a nanocrystalline layer

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • O. I. Zvirko,
  • O. M. Mokryy,
  • V. I. Kyryliv,
  • I. M. Romanyshyn,
  • O. V. Maksymiv,
  • Yu. O. Kulyk

摘要

The influence of the surface layer with nanocrystalline structure (NCS), electrolytical hydrogen charging of different intensities, and their complex action on the velocity of surface acoustic waves (SAW) on the 40Kh steel is studied. Changes in the NCS parameters under hydrogen action were revealed. The distribution of properties through the surface layer thickness using SAW with frequencies of 1, 3, and 6 MHz is estimated. A decrease in the SAW velocity is shown for the layer with NCS versus the matrix metal, as well as for the hydrogen-charged metal versus the non-hydrogen-charged one. A non-monotonic dependence of the change in SAW velocity on the hydrogen charging intensity of the steel is established. The dependence of the SAW velocity on the frequency for the hydrogen-charged steel, thus indicating a non-homogeneous distribution of changes in properties through the depth, is observed. The surface NCS layer is a barrier for the hydrogen penetration into the steel depth under hydrogen charging at ic = 0.1 mA/cm2.