Abstract
In order to obtain fundamental information on TiC coating on carbon steel using Pb-Ti melt, solid state reaction of S15C, S25C, S35C, S45C, S55C and SK5 specimens in molten Pb containing 0.1 to 5 mass%Ti at 1073 to 1373 K has been investigated. A dense and uniform TiC phase layer having Vickers hardness of 3000∼3500 was obtained on the surfaces of the specimens, although the TiC layer formed in molten Pb containing more than 1 mass%Ti was covered with a porous Ti2PbC phase layer having Vickers hardness of about 100. Thickness of the TiC layer increased with increasing Ti content of molten Pb, C content of the specimens, annealing time and temperature, while any definite relation could not be found between thickness of the Ti2PbC layer and annealing conditions. It is concluded that the TiC layer grows at the interface between TiC layer and molten Pb or Ti2PbC layer and that the growth rate is controlled by diffusion process of C atoms in the TiC layer.
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