Evaluating the erosion resistance of Ti6Al4V coatings deposited by cold spray

Abstract

Ti6Al4V alloys are widely used in components of the aeronautical industry. Consequently, impact erosion with small particles in suspension has revealed to be one of the most common damage processes during its service life. In order to study the possibility of repairing these components by spraying coatings, in this work, the behavior against erosion by the impact of abrasive particles of Ti6Al4V coatings manufactured by cold spray has been analyzed. The work includes the comparison between the responses of the coating and the bulk alloy, analyzing the effect of the speed and the angle of impact of the erosive particles on the erosion rate. The values of the spraying parameters used in this work have allowed obtaining coatings that showed a behavior against erosion similar to that of the bulk material. It has been possible to identify a ductile behavior of the coating and alloy dominated by plastic deformation. Through the study of erosion scars, two damage processes, microploughing and microcutting, have been identified as the dominant mechanisms responsible for the erosion process