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<p>This study investigated the effect of shot peening on the residual stress distribution metal arc welded S45C medium-carbon steel. Residual stress was analyzed using X-ray diffraction for surface stress and the contour method for internal stress distribution. Shot peening was applied for 10, 30, and 60&#xa0;min to evaluate its influence on stress redistribution and microstructural changes. The results showed that as-welded specimens exhibited high tensile residual stress near the inner surface and compressive stress on the outer surface, forming a highly non-uniform stress distribution. After shot peening, surface compressive residual stress increased to approximately −&#xa0;400&#xa0;MPa, and prolonged peening led to a more uniform stress distribution with reduced tensile stress in the inner region. In addition, shot peening increased dislocation density and refined the microstructure, as confirmed by electron backscatter diffraction analysis. These findings demonstrate that shot peening effectively optimizes residual stress conditions, enhancing the mechanical stability of welded joints. The study also highlights the necessity of using multiple measurement techniques to accurately assess residual stress distribution in welded structures.</p>

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Effect of Surface Treatment Process on the Residual Stress Distribution in S45C Butt-Welded Joints

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Yunji Cho,
  • Min Jae Baek,
  • Hyunsung Choi,
  • Hyeonil Park,
  • Moo-Young Seok,
  • Yong Nam Kwon,
  • Hyun-Min Sung,
  • Dooyoung Kim,
  • Dong Jun Lee

摘要

This study investigated the effect of shot peening on the residual stress distribution metal arc welded S45C medium-carbon steel. Residual stress was analyzed using X-ray diffraction for surface stress and the contour method for internal stress distribution. Shot peening was applied for 10, 30, and 60 min to evaluate its influence on stress redistribution and microstructural changes. The results showed that as-welded specimens exhibited high tensile residual stress near the inner surface and compressive stress on the outer surface, forming a highly non-uniform stress distribution. After shot peening, surface compressive residual stress increased to approximately − 400 MPa, and prolonged peening led to a more uniform stress distribution with reduced tensile stress in the inner region. In addition, shot peening increased dislocation density and refined the microstructure, as confirmed by electron backscatter diffraction analysis. These findings demonstrate that shot peening effectively optimizes residual stress conditions, enhancing the mechanical stability of welded joints. The study also highlights the necessity of using multiple measurement techniques to accurately assess residual stress distribution in welded structures.