Abstract：Laser cladding was carried out to prepare Ni3Al based alloy coatings on 45 steel by using Ni3Al/
25%Cr
3C2 mixed powder. Microstructure and wear resistance of the cladding materials was investigated. The
results indicate that the microstructure of the Ni
3Al based cladding materials contains mainly Ni3Al, NiAl, and in
situ-formed Cr
7C3. The hardness of the cladding materials is 599.6HV0.1, about 2.73 times of that of 45 steel.
Ni
3Al based cladding materials show sound wear resistance, owing to homogeneous distribution of fine Cr7C3.
The wear mechanism of the cladding materials is abrasive wear, and its friction coefficient is about 0.55. The spe‐
cific wear rate of the cladding materials is 1.12×10-5 mm3/N·m, only 28.6% of that of the vermicular graphite cast
iron.
2022, Vol. 32 
