Ultrasound improves grain refinement in metal 3D printing

Northwestern Polytechnical University in Xi’an, working with Wuhan University of Science and Technology, the National University of Singapore, and Trinity College Dublin, has demonstrated a non-contact ultrasound method for laser additive manufacturing. Published in Nature Communications, the work shows that transmitting ultrasound below 20 W·cm² through a gas medium refines grains and enhances mechanical performance […]