Abstract
The effects of heat treatment on the microstructure and high-temperature oxidation of selective laser melted TiC/IN625 nanocomposites were studied. Refined cellular grains, many dislocation structures and high proportion of sub-grain boundaries appeared in the as-built TiC/IN625 nanocomposites. After heat treatment (HT), the recrystallized grains and annealed twins did not appear in the TiC/IN625 nanocomposites. HT decreased the dislocation density, and most of grain boundaries had high misorientation angles. The HT-TiC/IN625 sample had the smallest parabolic rate. Only a single Cr2O3 oxide layer was formed in the HT-TiC/IN625 sample, meaning the heat treatment yielded a material with higher oxidation resistance.
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