Abstract:
In this study, Cr2O3 coatings were deposited on CF8M and CA6NM turbine steels by high-velocity oxy-fuel
(HVOF)-spray process and analyzed with regard to their performance under slurry erosion conditions. High
Speed Erosion Test Rig was used for slurry erosion tests, and the effects of three parameters, namely, average
particle size, speed (rpm), and slurry concentration on slurry erosion of these materials were investigated.
SEM micrographs on the surface of samples, before and after slurry erosion tests, were taken to study the
erosion mechanism. For the uncoated steels, CA6NM steel showed better erosion resistance in comparison
with CF8M steel. The HVOF-sprayed Cr2O3-coated CF8M and CA6NM steels showed better slurry erosion
resistance in comparison with their uncoated counterparts. It may be due to the higher hardness as a result of
HVOF-sprayed Cr2O3 coating in comparison with the uncoated CF8M and CA6NM steels.
