Microstructure and wear resistance of plasma cladding Al₂O₃+TiO₂/Fe alloy composite coating

Plasma cladding Ni-Cr-B-Si-Fe-based alloy coating and Fe-based alloy composite coating with Al₂O₃+TiO₂ were obtained on the Q235 substrate, and microstructure, microhardness and wear resistance of the two coatings were investigated contrastively. The results show that the interface solidification form of Fe-based alloy composite coating with Al₂O₃+TiO₂ have changed.They become small dendrite from primary lathy dendrite, and offer core for solidification.The microstructure is mainly based on γ