Submicron MC-type reinforced coating produced by laser alloying

In order to study the influence of carbides produced by in situ synthesis of various chemical reactions or direct addition on wear resistance of carbide reinforced composite coatings,TiC reinforced Fe-based composite coatings were prepared on T10 steel substrate by laser alloying.Then their microstructures,phases,microhardness and wear properties were investigated and analyzed.Results showed that compact and non-defective alloy layers were obtained,consisting of γ-CrFe7C0.5 and submicron MC(M=Ti,Cr,W) particles.Austenite transformed into martensite in wear testing because of processing hardening.Wear weight loss of direct addition was 2 times to 3 times larger than that of in situ synthesis.The content of carbides produced through combination reaction between Ti and C was higher than that produced through reduction reaction between TiO2 and C,which led to a better tribological performance.The results can serve as a guide in selecting the best method of the ceramic phase introduction when preparing TiC reinforced Fe-based composite coatings.