Abstract:
TiB
2/4Cr13 steel composites with different mass fractions (0.6%, 1.2%, 1.8%) of TiB
2 were prepared by mechanical ball milling and selective laser melting forming, and the effects of TiB
2 content on the phase composition, microstructure, hardness, wear resistance and corrosion resistance of the composites were studied. The results show that the composite contained α-Fe, γ-Fe and TiB
2 phases. With the increase of TiB
2 content, the relative density of the composite decreased. When the mass fraction of TiB
2 was 0.6%, the microstructure of the composite was the most fine and uniform. With the increase of the content of TiB
2, the grain size increased, and cracks, micropores and other defects appeared in the microstructure. With the increase of TiB
2 content, the hardness of the composites decreased, the friction coefficient and wear rate increased, the pitting and free-corrosion potential decreased, and the free-corrosion current density increased, indicating that the corrosion resistance decreased.