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  Ultrasonic Impact Treatment is a surface alteration technique that induces compressive residual stresses to improve product fatigue and corrosion resistance. It is usually referred to as UIT in industry vocabulary. It is pretty similar to work hardening as it uses ultrasonic energy for metals.   UIT is a part of High-Frequency Mechanical Impact or HFMI techniques. Controlled residual compressive tension, particle processing, and grain reduction in size can all be achieved through UIT. Low and heavy cycle fatigue are both improved. And when compared to non-UIT specimens, they are reported to increase up to ten times.   Ultrasonic vibrations or waves are generated by an electromechanical transmitter and transmitted to an object in UIT. Activating an acoustically adjusted resonator bar with a Piezoelectric ultrasonic instrument causes it to resonate. The energy given to the surface layer by these ultra-high frequency shocks is transmitted via the interaction of pins. These pins