PHASE COMPOSITION AND STRUCTURE OF TIC – HSS STEEL BINDER PRODUCED BY SHS METHOD

The paper describes the production of «TiC – steel binder» metal matrix composites by self-propagating high-temperature synthesis (SHS) in reaction powder mixtures of titanium, black carbon (soot), and HSS powders in laminar burning mode. Composite powders with various steel binder contents were prepared by milling and screening the synthesis products. The synthesis products were studied by optical and scanning electron microscopy, X-ray diffraction analysis, and electron probe microanalysis. It was found that an average size of carbide inclusions in the structure of the metal matrix composite depends on the content of the heat inert steel powder in reaction mixtures and can be controlled over a wide range. The lattice parameter of the titanium carbide formed in the SHS process is smaller than that of equiatomic TiC. The main reason for decrease in the lattice parameter is the non-stoichiometric carbide composition preconditioned by the carbon deficit. According to the results of the electron probe microanalysis, titanium carbide inclusions in the composite structure additionally contain up to 1 at% of iron and other alloying elements. The dissolution of iron and alloying elements leads to a certain increase in the carbide lattice parameter, which partially compensates for decrease in the lattice parameter caused by the carbon deficit. According to the results of the X-ray microanalysis, ferrite as a main phase in the metal binder has an ultra-equilibrium content of alloying elements. SHS products annealed at700 °Cresult in decomposition of retained austenite and dissolution of alloying element carbides in ferrite. 

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