Scholarlink

<p>The effects of ultrasonic impact treatment (UIT) on the tensile deformation behavior of different local regions of DH36 steel welded joints were analyzed based on the digital image correlation (DIC) method and tensile numerical simulation models. The tensile performance parameters for different local regions were obtained based on Swift equation. The effects of the UIT on microstructure and microhardness were also analyzed. The finite element method was used to calibrate the process of measuring residual stress by the hole-drilling method. Additionally, the Welding-UIT numerical simulation model of DH36 steel was established to simulate the stress field. The results indicate that the UIT can comprehensively and significantly improve the tensile performance of welded joints. The tensile strength of the weld metal (WM), heat-affected zone (HAZ), and base material (BM) can be, respectively, increased by 63.0&#xa0;MPa, 37.0&#xa0;MPa, and 34.0&#xa0;MPa when the UIT time reaches 20&#xa0;min. The yield ratio of each region decreased, indicating that both strength and ductility were synergistically improved. The UIT introduced compressive stress on the surface and near-surface of the material. After the UIT, grain refinement and severe plastic deformation of the surface layer can be observed, with the WM being the most affected. Microhardness also shows a significant increase after the UIT.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental and Simulation Study on the Effect of Ultrasonic Impact on the Local Tensile Properties of DH36 Steel Welded Joints

  • 期刊论文

  • 发表日期：

    2026年4月23日

查看全文
  • Liqiang Gao,
  • Feilong Liu,
  • Cong Yang,
  • Yansong Wang,
  • Bangping Gu,
  • Guanhua Xu,
  • Liang Liu

摘要

The effects of ultrasonic impact treatment (UIT) on the tensile deformation behavior of different local regions of DH36 steel welded joints were analyzed based on the digital image correlation (DIC) method and tensile numerical simulation models. The tensile performance parameters for different local regions were obtained based on Swift equation. The effects of the UIT on microstructure and microhardness were also analyzed. The finite element method was used to calibrate the process of measuring residual stress by the hole-drilling method. Additionally, the Welding-UIT numerical simulation model of DH36 steel was established to simulate the stress field. The results indicate that the UIT can comprehensively and significantly improve the tensile performance of welded joints. The tensile strength of the weld metal (WM), heat-affected zone (HAZ), and base material (BM) can be, respectively, increased by 63.0 MPa, 37.0 MPa, and 34.0 MPa when the UIT time reaches 20 min. The yield ratio of each region decreased, indicating that both strength and ductility were synergistically improved. The UIT introduced compressive stress on the surface and near-surface of the material. After the UIT, grain refinement and severe plastic deformation of the surface layer can be observed, with the WM being the most affected. Microhardness also shows a significant increase after the UIT.