Microstructure and Wear Resistance of TiCp/Ti6Al4V Composite Coatings by Follow-Up Ultrasonic-Assisted Laser Additive Manufacturing

With the increasing demand for high agility and fast response of high-level equipment in aerospace energy power fields, it is increasingly urgent to improve performance high-temperature wear resistance corresponding components. Ceramic-reinforced titanium matrix composites have excellent resistance, but, laser additive manufacturing, primary ceramic phase coarse, morphology difficult control, which limits their further development. In this investigation, a follow-up ultrasonic-assisted laser-additive-manufacturing method was proposed prepare 30 wt.% TiC/Ti6Al4V composite coating on Ti6Al4V surface. Under effects ultrasonic cavitation acoustic streaming, content unmelted TiC reduced, dendritic solidification process broken distribution uniformity improved. The decreased significantly under action, only 50.23% that without action. At same time, average size from 61.59 ?m 27.04 ?m, 56.10% smaller than microhardness reached maximum 656.70 HV0.2 power, 83.21% higher substrate, 26.44% power. Due ultrasonic-cavitation acoustic-streaming effects, obviously decreased, so friction coefficient increased, mechanism changed abrasive adhesive wear.