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<p>An ultrasonic impact system was established to conduct the ultrasonic impact treatment (UIT) on the Q690 welded joint, and the effects of UIT on residual stress, microhardness, microstructure, and electrochemical corrosion resistance were studied. The results indicate the average transverse and longitudinal residual stresses were reduced by 56.4% and 54.7% after 12&#xa0;min of UIT at 1.6 A. Furthermore, the microhardness of the Q690 specimen, perpendicular to the weld, increased notably by 30.6% with the three-needle head and 25.3% with the square head under the same UIT conditions. Subsequently, the microstructure which was observed by SEM and metallographic microscope shows an obvious refinement phenomenon after the UIT. Finally, the corrosion current density of the welded joint after the UIT was reduced, and the impedance modulus in the low frequency region was increased. According to the comprehensive analysis, it can be concluded that the electrochemical corrosion resistance of the Q690 welded joint can be improved by the UIT process. The findings confirm that the enhancement in the electrochemical corrosion resistance of the Q690 welded joint could be primarily attributed to three factors: the generated plastic deformation, the refinement of the grain size, and the reduction of residual tensile stress.</p>

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Effects of Ultrasonic Impact on Residual Stress, Microstructure, and Electrochemical Properties of Q690 Welded Joint

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Bangping Gu,
  • Chengjian Yin,
  • Liqiang Gao,
  • Yansong Wang,
  • Yuchen Yang,
  • Guanhua Xu,
  • Heng Zhang,
  • He Zheng,
  • Wenzhe Xue

摘要

An ultrasonic impact system was established to conduct the ultrasonic impact treatment (UIT) on the Q690 welded joint, and the effects of UIT on residual stress, microhardness, microstructure, and electrochemical corrosion resistance were studied. The results indicate the average transverse and longitudinal residual stresses were reduced by 56.4% and 54.7% after 12 min of UIT at 1.6 A. Furthermore, the microhardness of the Q690 specimen, perpendicular to the weld, increased notably by 30.6% with the three-needle head and 25.3% with the square head under the same UIT conditions. Subsequently, the microstructure which was observed by SEM and metallographic microscope shows an obvious refinement phenomenon after the UIT. Finally, the corrosion current density of the welded joint after the UIT was reduced, and the impedance modulus in the low frequency region was increased. According to the comprehensive analysis, it can be concluded that the electrochemical corrosion resistance of the Q690 welded joint can be improved by the UIT process. The findings confirm that the enhancement in the electrochemical corrosion resistance of the Q690 welded joint could be primarily attributed to three factors: the generated plastic deformation, the refinement of the grain size, and the reduction of residual tensile stress.