Ni-based alloy coatings were fabricated on H13 steel substrate by Nd∶YAG laser cladding methods.The microstructure

phase constitutions and wear resistance of the coating were investigated by means of scanning electron microscope（SEM）

energy dispersive spectrometer（EDS）

X-ray diffraction（XRD）and abrasion testing machine.The results reveal that

Ni-based alloy coating is dense with absence of obvious holes and cracks

which is mainly composed of fine dendrites and eutectics.The dendrites are composed ofγ-Ni

and the eutectic crystal is composed of M

23

C

6

M

7

C

3

Ni

3

Fe

Ni

3

B.Compared with other regions of coating

the grain size of surface is the finer and the grain orientation disappears.The average microhardness of Ni-based alloy coating reaches 708.4 HV

0.2

which is 1.60 times higher than that of quenched and tempered H13 steel.With the increase of load and sliding speed of abrasion testing machine

the wear resistance of the coating is superior to that of H13 steel.In process of wear

the wear of coating exhibits mainly abrasive wear accompanied with a small amount of adhesive wear

while the H13 steel wear is mainly characterized by adhesive wear accompanied with a small amount of abrasive wear.