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<p>The present study investigates the effect of Ultrasonic Shot Peening (USSP) for 2&#xa0;min and 5&#xa0;min on the surface integrity, microstructure, corrosion behaviour, and mechanical properties of Selective Laser Melted (SLM) and Conventionally Manufactured (CM) Commercially Pure Titanium (Ti)&#xa0;metal. The SLM Ti exhibits a characteristic needle-like α′ martensitic microstructure, while the CM Ti displays equiaxed α-phase grains. Both the cases, post USSP treatment shows the significant surface grain refinement and increased dislocation density, as confirmed by EBSD and XRD analyses. This grain refinement leads to a notable enhancement in surface hardness approximately to 57.45% for CM Ti and 22.9% for SLM Ti, which is primarily attributed to strain hardening and Hall–Petch grain boundary strengthening. Potentiodynamic polarization curves reveal a substantial improvement in corrosion resistance for both the conditions. Notably, for SLM Ti, the USSP treatment for 2&#xa0;min results in optimal corrosion resistance, whereas in CM Ti, the best corrosion resistance was observed after 5&#xa0;min of USSP treatment. This is mainly attributed to the formation of surface cracks in SLM Ti with 5&#xa0;min of USSP duration, which was not present in CM Ti. Furthermore, USSP significantly reduced the coefficient of friction, from 0.44 to 0.37 for CM Ti and from 0.26 to 0.23 for SLM Ti, owing to enhanced surface hardness and tribofilm formation.</p>

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Role of ultrasonic shot peening on the microstructure, corrosion and tribological behavior of selective laser melted and conventionally manufactured Ti metal

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • M. Srikanth,
  • B. Sai Charan,
  • Kausik Chattopadhyay,
  • Deepak K. Pattanayak

摘要

The present study investigates the effect of Ultrasonic Shot Peening (USSP) for 2 min and 5 min on the surface integrity, microstructure, corrosion behaviour, and mechanical properties of Selective Laser Melted (SLM) and Conventionally Manufactured (CM) Commercially Pure Titanium (Ti) metal. The SLM Ti exhibits a characteristic needle-like α′ martensitic microstructure, while the CM Ti displays equiaxed α-phase grains. Both the cases, post USSP treatment shows the significant surface grain refinement and increased dislocation density, as confirmed by EBSD and XRD analyses. This grain refinement leads to a notable enhancement in surface hardness approximately to 57.45% for CM Ti and 22.9% for SLM Ti, which is primarily attributed to strain hardening and Hall–Petch grain boundary strengthening. Potentiodynamic polarization curves reveal a substantial improvement in corrosion resistance for both the conditions. Notably, for SLM Ti, the USSP treatment for 2 min results in optimal corrosion resistance, whereas in CM Ti, the best corrosion resistance was observed after 5 min of USSP treatment. This is mainly attributed to the formation of surface cracks in SLM Ti with 5 min of USSP duration, which was not present in CM Ti. Furthermore, USSP significantly reduced the coefficient of friction, from 0.44 to 0.37 for CM Ti and from 0.26 to 0.23 for SLM Ti, owing to enhanced surface hardness and tribofilm formation.