Friction and Wear Properties of FeAl-TiB2 Composite Coating Produced by Extreme High-Speed Laser Cladding
To improve the friction and wear performance of FeAl-based composite coatings at high temperatures(600 ℃),different FeAl-TiB2 composite coatings with varying TiB2 mass fractions were in situ prepared on the surface of 32Cr3Mo1V steel using an ultra-fast laser cladding process,with Fe powder,Al powder,and TiB2 powder as the raw materials.The phase composition,microstructure and wear mechanism of the composite coating were studied.The results showed that the in-situ composite coating formed a good metallurgical bond with the substrate.With the increase of the mass fraction of TiB2,the coating surface became denser,and the remelted TiB2 was distributed on the surface of the composite coating in the form of grid.The TiB2 reinforced phase can withstand the compressive stress and shear force during the friction process,which effectively improves the wear resistance of the composite coating.When the mass fraction of TiB2 is 10％,the friction coefficient and wear rate of the composite coating are the lowest,and the wear resistance is the best.With the increase of the mass fraction of TiB2,the wear mode gradually changes from plastic deformation to abrasive wear,accompanied by oxidation wear.
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