Microstructures of laser cladding of intermetallic-ceramic composite coatings

The microstructures of laser cladding of (Ni-24.5%(atom fraction)Al)+50%(mass haction)WC coatings before and after aging was comparetively studied by using SEM and TEM. It is shown that dissolving of WC and reprecipitating in the forms of WC and W₂C occurred during laser cladding, and intermetallic γ' (Ni₃Al) orderly precipitate from metastable supersaturant Ni-matrix solid solution after heat treatment. The structures are favorable for coating's properties.