Abstract
The present work investigated microstructures of in situ synthesized 10 vol% TiC-Fe and 10 vol% (TiW)C-Fe composites. The results show that in the TiC-Fe composite, as only second phase, TiC is in two kinds of morphologies, i.e., spherulic and rod-like ones. It is thought that the spherulic TiC is a proeutectic phase and the rod-like one is a eutectic phase. In situ synthesis of the 10 vol% (TiW)C-Fe composite in liquid iron is feasible. In the composite, the (TiW)C reinforcements as only one second phase are more homogeneously distributed in iron matrix, and most of them are spherulic and the few rod-like. Within the spherulic (TiW)C phase, there is an inhomogeneous distribution of titanium and tungsten. Its core is rich in titanium, while the periphery rich in tungsten. Such the characteristic microstructure is closely related with its formation during solidification. Comparing with the TiC, the (TiW)C phase has a density matchable for iron melt, which makes it more suitable as in situ synthesized reinforcements in large size ingots of iron matrix composites.
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