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<p>Ultrasonic-assisted abrasive peening (UAP) is proposed in this study which offers an efficient approach to pre-treat metallic components. This process employs a peening medium comprising of a fluid mixed with a stabilizer and abrasives. The properties of the peening medium, such as density, surface tension, and viscosity influence the dynamics of cavitation bubble and, hence, the resultant outcomes of the peening process. In this study, the effect of peening medium was investigated by mixing 2&#xa0;wt% surfactant and 4&#xa0;wt% YSZ abrasives into water, soybean oil, corn oil, and olive oil as peening media. The cavitation bubble dynamics and the induced abrasive velocity was numerically determined by the Keller–Miksis and Newtonian mechanics equations. It was observed that the abrasive velocity in water was 2.3-fold higher than in oils. Specifically, water imparted maximum abrasive velocity of 283&#xa0;m/s induced by microjets and 231&#xa0;m/s induced by shockwaves, whereas olive oil resulted in lower abrasive velocity of 126&#xa0;m/s and 134&#xa0;m/s, respectively. Consistent with the numerical analysis, the water-peened Ti–6Al–4V sample exhibited highest residual stress of (−)575.1 ± 10&#xa0;MPa, while no residual stresses were observed with oil-based peening. Viscosity was identified as the key medium property influencing the cavitation dynamics, with oils demonstrating 75 times higher viscosity than water. Hence, selection of low viscous peening medium is essential for enhanced UAP outcomes.</p> Graphical abstract <p></p>

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Role of Peening Medium in Ultrasonic-Assisted Abrasive Peening Process: A Numerical and Experimental Study

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • S. V. V. N. Siva Rao,
  • N. D. Chakladar,
  • Soumitra Paul

摘要

Ultrasonic-assisted abrasive peening (UAP) is proposed in this study which offers an efficient approach to pre-treat metallic components. This process employs a peening medium comprising of a fluid mixed with a stabilizer and abrasives. The properties of the peening medium, such as density, surface tension, and viscosity influence the dynamics of cavitation bubble and, hence, the resultant outcomes of the peening process. In this study, the effect of peening medium was investigated by mixing 2 wt% surfactant and 4 wt% YSZ abrasives into water, soybean oil, corn oil, and olive oil as peening media. The cavitation bubble dynamics and the induced abrasive velocity was numerically determined by the Keller–Miksis and Newtonian mechanics equations. It was observed that the abrasive velocity in water was 2.3-fold higher than in oils. Specifically, water imparted maximum abrasive velocity of 283 m/s induced by microjets and 231 m/s induced by shockwaves, whereas olive oil resulted in lower abrasive velocity of 126 m/s and 134 m/s, respectively. Consistent with the numerical analysis, the water-peened Ti–6Al–4V sample exhibited highest residual stress of (−)575.1 ± 10 MPa, while no residual stresses were observed with oil-based peening. Viscosity was identified as the key medium property influencing the cavitation dynamics, with oils demonstrating 75 times higher viscosity than water. Hence, selection of low viscous peening medium is essential for enhanced UAP outcomes.

Graphical abstract