Dry Sliding Friction and Wear Properties of Fe-based Alloy Laser Cladding Coatings Added with Different Solid Lubricants
Fe-based alloy coatings with different content of WS2(mass fraction 0-8.0％)and CaF2(mass fraction 5.0％)solid lubricants and different content of h-BN(mass fraction 0-2.0％)and CaF2(mass fraction 0-2.0％)solid lubricants were prepared on the surface of CL60 wheel steel by laser cladding technique,respectively.The microstructures of Fe-based alloy coatings added with different solid lubricants as well as the dry sliding friction and wear behavior were investigated.The results show that all coatings were mainly composed of dendritic and eutectic structures,and the surface hardnesses all reached about 800 HV,which was about twice as much as that of CL60 steel.The friction factor of WS2+CaF2/Fe-based alloy coating decreased with the increase of the content of WS2,and the wear mass loss first decreased and then was basically stabilized.When the mass fraction of WS2 was 6.0％,the wear mass loss was the lowest,which was reduced by 26.7％compared with that of the Fe-based alloy coating without solid lubricant;at this time,the pore structure amount was the least,the damage of the wear surface was slight,and the wear mechanism was abrasive wear.With the increase of h-BN content and the decrease of CaF2 content,the friction factor and wear mass loss of h-BN+CaF2/Fe-based alloy coating both decreased first and then increased,and when the mass fractions of CaF2 and h-BN were both 1.0％,the stabilized friction factor and the wear mass loss were the smallest,which were reduced by 32.7％and 33.3％,respectively,compared with those of the Fe-based alloy coating without solid lubricant;at this time,the grain was the finest,the microstructure was the most dense,the wear surface was dominated by fine abrasions,and the wear mechanism was slight abrasive wear.
wheel steellaser claddingsolid lubricant materialmicrostructurefriction and wear property
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