Study on Fe–Ti–V–C composite produced by self-propagating high temperature synthesis.

A (Ti,V)C/Fe composite was produced by self-propagating high temperature synthesis combined with powder metallurgy using Ti, Fe, FeV and carbon powder. The microstructure of the Fe–(Ti,V)C composite was studied by scanning electron microscopy and X-ray diffraction; with the help of differential thermal analysis, the reaction mechanism of the Fe–Ti–V–C system was discussed. The results show that the production of an iron matrix composite reinforced by (Ti,V)C particulates using the process is feasible. (Ti,V)C particles exhibit homogeneous distribution in the α-Fe matrix. The reaction mechanism is as follows: first, allotropic change Feα→Feγ and the reaction FeV+C→Fe+VC at 765·7°C; second, formation of the compound Fe2Ti at 1058·5°C because of the eutectic reaction between Ti and Fe; third, reaction between carbon and melted Fe2Ti causing formation of TiC at 1140·4°C; finally, formation of (Ti,V)C due to the solubility between TiC and VC. [ABSTRACT FROM AUTHOR]

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