The influence of processing parameters on laser cladding composite coatings on TiAl intermetallic alloy

The effect of processing parameters on the microstructure and wear property of laser cladding γ/Cr7C3/TiC composite coatings on TiAl intermetallic alloy substrates with NiCr-50%Cr3C2precursor mixed powder is investigated.The results show that the microstructure of the laser cladding composite coatings is refined and the microhardness increases with the increasing of the laser beam scan-rate,but the thickness of the clad coating decreases.The laser cladding coating with the moderate(2.0mm/s) scan-rate exhibits the best wear-resistance under the full dry sliding wear test condition.