Abstract: NiCr metal matrix composite reinforced with
Cr3C2 particles can be applied as
coating to various pieces of equipment, including those operating under
fatigue. In the present study, the nanometric powder was obtained by
high energy milling and sprayed by the high velocity oxygen fuel
technique on ASTM A516 steel substrate. The comparison was made between
the layer obtained from powders in nanometric scale, micrometric scale
and mixing 50% of both. The coating thickness, hardness,
microstructure, porosity and roughness were evaluated. Fatigue tests
were performed on the three coatings in addition to the layer free
substrate. The effect of coating morphology and its roughness on fatigue
performance was studied. The surface roughness of the Nano coating was
significantly lower than both of the other coatings. However, the three
different layers that were tested did not experience significant
differences in their fatigue performance. All three coatings had lower
fatigue performance than the steel substrate.Keywords: nanometric coating, HVOF, fatigue,
Cr3C2-25NiCr coating.