Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy

The wear and fretting behaviour of IN625 cold spray coatings was analysed and the results are presented. The cold spray conditions were selected in order to obtain coatings with minimum porosity and maximum particles splat. This leads to compact and hard deposited material able to resist wear damaging and to dissipate energy during fretting. The coating's strength was evaluated through nanoindentation that revealed an increased hardness from the surface toward the substrate. This different hardening behaviour from the coating surface toward the substrate leads to increased resistance to fretting and wear as the maximum stresses increase. This was revealed by scratch tests performed at linearly increasing loads that allowed identifying of the damage mechanisms acting on the coating as the triaxial stresses increase. The hardening behaviour of the coating also influenced the fretting behaviour revealed by the weight loss experienced by varying the fretting maximum load.

Automated summary

The wear and fretting behavior of IN625 cold spray coatings were analyzed, demonstrating that coatings produced under specific conditions can offer improved wear resistance and energy dissipation capabilities. Nanoindentation evaluation revealed an increase in hardness from the surface towards the substrate, leading to enhanced resistance to wear. Scratch tests at increasing loads also showed the coating's ability to resist damage under triaxial stresses.