Laser-acoustic method of processing for non-ferrous and ferrous metals

An experimental study was conducted to study the effect of ultrasonic vibration on the microstructure, microhardness, and strength properties of bronze, steel, and aluminium specimens fabricated by direct laser deposition using ultrasound. The results showed that ultrasonic vibration can reduce porosity, improve the microstructure with a smaller average grain size and fragment the harmful phase with uniform distribution, thereby increasing the microhardness and ultimate strength of the manufactured parts. (paper)