Abstract:
The Co40 alloy coatings with different Cr
3C
2 nanoparticle content (0, 20wt%, 30wt%, 40wt%) were obtained by plasma surfacing on low-carbon steel Q890, and then the effects of the Cr
3C
2 nanoparticle content on the microstructure and wear resistance of the alloy coating were studied. The results show that the Co40 alloy coating was composed of developed columnar crystals and netlike eutectic crystals among them. With the addition of Cr
3C
2 nanoparticle, the microstructure was refined and the solidification characteristic changed from the hypoeutectic crystallization to the hypereutectic crystallization. Moreover, the hardness and wear resistance of the alloy coating were significantly improved. When the Cr
3C
2 nanoparticle addition was 30wt%, the wear mass loss of the alloy coating was the lowest, which decreased by 55.8% comparing to that without Cr
3C
2; the wear surface was relatively smooth with only little slight furrows and almost no peeling phenomenon was observed.