| A nanocryastalline surface layer of 38CrSi alloyed steel was fabricated by supersonic fine particles bombarding (SFPB). Microstructure of the nanocrystalline surface layer was observed by means of TEM, and tribological properties of the layer were tested by CETR equipment etc. The results indicate that the nanocrystalline surface layer was characterized by nano-scale equiaxed grains with random crystallographic orientations, as indicated by the dark-field image and the selected area electron diffraction (SAED) patterns. And average grains size on the top surface layer is approximately 25 nm. Nanocrystalline surface layer did not perform excellent tribological properties at unlubricated condition, whereas, comparing with lower friction coefficient and excellent wear-resistance performance at lubricated condition. And the wear mechanism of the nanocrystalline surface layer has been discussed. |
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