Effect of Friction-Pair on Tribological Behavior of High Speed Steel Surface-Modified with CrAlSiN Coatings

The influence of friction-pair type on the microstructures and tribological behavior of high-speed steel surfaces,modified with CrAlSiN coatings synthesized by pulsed laser cladding,was investigated with X-ray diffraction(XRD),scanning electron microcopy(SEM),energy dispersive spectroscopy(EDS),and ball-on-disc tester.The results show that evaluation of tribological behavior depends on the friction pair properties.For example,when a friction pair of 316 stainless-steel was slid,shallow wide wear-tracks formed on the CrAlSiN,because of large friction coefficient and small wear-rate; when TC11 Ti-alloy was slid,large deep wear-tracks formed,because of large wear-rate.The similarity of the two friction pairs was that their wear mechanisms were abrasive-wear and adhesive-wear.By the way,high density of pin-holes,pits and while particles was found to exist on the porous hard CrAlSiN coatings,with strong interfacial adhesion and 2.5 μm in thickness.