Abstract
Composite coatings were fabricated by laser alloying of titanium alloy Ti-6Al-4V with boron and graphite mixed powders in a nitrogen gas environment. XRD spectra indicate that the compounds formed in the coatings are mainly titanium carbides, borides, and nitrides. SEM and EMPA micrographs show that the morphology of the compounds in the top layer of the coatings is different from that in the inner layer. This is attributed primarily to uneven distribution of the alloying elements and different solidification cooling rates of the areas in the same melt pool. The microstructure of the coatings produced by laser alloying with boron and graphite mixed powder is finer than that produced by alloying with boron or graphite powder separately. In addition, yttria has a refining effect on the microstructure of the coatings, and the mechanism of refinement is analyzed.
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