Study on the friction and wear properties of the surface nano-crystallized GCr15 steel induced by the surface mechanical attrition treatment

Nano-structured layers are fabricated on the surface of GCr15 steel by using the surface mechanical attrition treatment(SMAT).The microstructure of the surface layer was characterized by means of X-ray diffraction(XRD) and transmission electron microscopy(TEM).The friction and a wear properties are measured by a UMT-2 friction and wear tester.The analytical results show that the 15 min treatment time in this experiment is the best way of improving the friction and wear properites of GCr15 steel.The SEM observation of the wear scars shows that the dominant wear mechanism of the specimen treated for 15 min changes from adhesive wear into particle wear.