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<p>The influence of the technological environment (TE) on the formation of a&#xa0;nanocrystalline structure (NCS) in normalized carbon steel&#xa0;45, subjected to mechanical pulse treatment (MPT), was investigated in terms of the NCS parameters, multicycle fatigue resistance, and corrosion-fatigue failure in a&#xa0;3% NaCl aqueous solution. A&#xa0;surface layer with a&#xa0;ferrite-austenite NCS and a&#xa0;ferrite grain size of&#xa0;14 and 23 nm was obtained on the specimens after MPT in mineral oil and air, respectively. The fatigue endurance of steel with NCS is significantly higher than that without the surface-treated layer and is practically independent of the TE type applied during MPT. The highest corrosion fatigue resistance has the steel with the NCS surface formed by MPT in oil. The obtained results were analyzed, taking into account the NCS characteristics, the microhardness of the strengthened layer, the distribution of residual stresses, and chemical elements (H,&#xa0;N, C, and&#xa0;O).</p>

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Corrosion fatigue endurance of steel 45 after surface nanostructuring by mechanical pulse treatment in different environments

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • V. I. Kyryliv,
  • O. V. Maksymiv,
  • O. I. Zvirko,
  • B. R. Tsizh,
  • Ya. B. Kyryliv

摘要

The influence of the technological environment (TE) on the formation of a nanocrystalline structure (NCS) in normalized carbon steel 45, subjected to mechanical pulse treatment (MPT), was investigated in terms of the NCS parameters, multicycle fatigue resistance, and corrosion-fatigue failure in a 3% NaCl aqueous solution. A surface layer with a ferrite-austenite NCS and a ferrite grain size of 14 and 23 nm was obtained on the specimens after MPT in mineral oil and air, respectively. The fatigue endurance of steel with NCS is significantly higher than that without the surface-treated layer and is practically independent of the TE type applied during MPT. The highest corrosion fatigue resistance has the steel with the NCS surface formed by MPT in oil. The obtained results were analyzed, taking into account the NCS characteristics, the microhardness of the strengthened layer, the distribution of residual stresses, and chemical elements (H, N, C, and O).