采用等离子堆焊技术在 Q890低碳钢表面制备了不同纳米 Cr3 C2颗粒含量(质量分数分别为0,20％,30％,40％)的Co40合金层,研究了纳米Cr3 C2颗粒含量对该合金层组织与耐磨性的影响.结果表明：Co40合金层主要由发达柱状晶及其间的网状共晶组成；添加纳米 Cr3 C2颗粒后其组织发生细化,结晶方式由亚共晶结晶转变为过共晶结晶且合金层的硬度和耐磨性均得到了明显提高；当纳米Cr3 C2颗粒为30％时,合金层的磨损质量损失最小,比未添加 Cr3 C2的减少了55．8％,磨损表面较平整,只存在轻微的犁沟,几乎没有剥落现象.
The Co40 alloy coatings with different Cr3 C2 nanoparticle content (0,20wt%,30wt%,40wt%) were obtained by plasma surfacing on low-carbon steel Q890,and then the effects of the Cr3 C2 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 Cr3 C2 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 Cr3 C2 nanoparticle addition was 30wt%,the wear mass loss of the alloy coating was the lowest,which decreased by 5 5 .8% comparing to that without Cr3 C2;the wear surface was relatively smooth with only little slight furrows and almost no peeling phenomenon was observed.
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