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<p>Ultrasonic surface rolling process (USRP) is a highly promising surface strengthening technique. It enhances the surface integrity of components by generating residual compressive stress within the surface layer, promoting work hardening, and improving surface finish. This process significantly improves the service performance and life span of components. However, the underlying strengthening mechanisms of USRP have not been systematically investigated. In this study, an eccentric-type ultrasonic rolling device was independently developed. Surface rolling tests and dry friction tests were conducted on TC4 titanium alloy under various rolling parameters, aiming to improve rolling efficiency while elucidating the influence of processing parameters on the surface integrity of workpieces. The results demonstrate that, compared to CSRP, the eccentric ultrasonic rolling process improved residual compressive stress by 5-27.61%, reaching a maximum value of − 663.61&#xa0;MPa; reduced the average surface roughness by 22.71%, achieving an optimal value of 1.131&#xa0;μm; and increased microhardness by 23.11%, with a maximum value of 489.67&#xa0;HV. Furthermore, the friction coefficient between the strengthened workpiece and YG6 cemented carbide decreased, indicating that ultrasonic rolling enhances the wear resistance of the workpiece. This study provides valuable engineering insights for the application of ultrasonic rolling to a range of difficult-to-machine materials.</p>

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Research on the Surface Characteristics of TC4 Titanium Alloy Subjected to Eccentric Ultrasonic Surface Rolling Process

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Jinglin Tong,
  • Yahang Zheng,
  • Shuaikun Yang,
  • Xinbo Li,
  • Linxuan Liu,
  • Daohui Xiang,
  • Guofu Gao

摘要

Ultrasonic surface rolling process (USRP) is a highly promising surface strengthening technique. It enhances the surface integrity of components by generating residual compressive stress within the surface layer, promoting work hardening, and improving surface finish. This process significantly improves the service performance and life span of components. However, the underlying strengthening mechanisms of USRP have not been systematically investigated. In this study, an eccentric-type ultrasonic rolling device was independently developed. Surface rolling tests and dry friction tests were conducted on TC4 titanium alloy under various rolling parameters, aiming to improve rolling efficiency while elucidating the influence of processing parameters on the surface integrity of workpieces. The results demonstrate that, compared to CSRP, the eccentric ultrasonic rolling process improved residual compressive stress by 5-27.61%, reaching a maximum value of − 663.61 MPa; reduced the average surface roughness by 22.71%, achieving an optimal value of 1.131 μm; and increased microhardness by 23.11%, with a maximum value of 489.67 HV. Furthermore, the friction coefficient between the strengthened workpiece and YG6 cemented carbide decreased, indicating that ultrasonic rolling enhances the wear resistance of the workpiece. This study provides valuable engineering insights for the application of ultrasonic rolling to a range of difficult-to-machine materials.