The treatment of surface nanocrystallization on Fe-C alloys with different carbon content was conducted by the Supersonic Fine Particles Bombarding （SFPB）. Experimental results showed that the surface layer of pure iron and carbon steels could be transformed into nanocrystalline structure, while the surface layer of grey iron could not be transformed. This might be attributed to the difference of microstructure and the capability of plastic deformation. The thickness of deformed layer was correlated with the carbon content and it was in inverse proportional to about one-half power of the yield strength. The optimal effect of surface nanocrystallization by SFPB treatment was achieved on pure iron and mild steels.
修改评论