To study the effects of different grinding parameters

different mass fraction and sizes of Cr3C2 on ground surface quality of the laser cladding Cr3C2/Ni based composite coating

as well as to explore the grinding characteristics and the generation mechanism of the ground surface defects

the grinding experiment was conducted by using CBN grinding wheel

and the results show that the defects on the ground surface of laser cladding Cr3C2/Ni based composite coating mainly include two categories: one is generated in the Ni based alloy which includes debris adherence

grinding traces

micro-crack and cracks; the other is the broken Cr3C2 particles and voids generated by the pullout of the broken Cr3C2. The debris adherence in the Ni based alloy is easier to form under the condition of smaller depth of cut and lower Cr3C2 mass fraction in the coating. As the cutting depth increases

deeper grinding marks and micro-crack appear. The cracks form in the Ni based alloy when the mass fraction of Cr3C2 in the coating is higher than 20%. More voids are found on the ground surface when the mass fraction of Cr3C2 is 30%. Under the same grinding parameters

the Ra value of ground coating increases with the increase of the size of Cr3C2 particles and decreases with the increase of mass fraction of Cr3C2. However

the Ra value increases slightly when the mass fraction of Cr3C2 exceeds 20%. The experimental results reveal that there are fewer defects on the ground surface when the size of Cr3C2 is smaller and the wheel speed is higher.