Cr3C2对镍基碳化钨激光熔覆层组织与性能的影响

研究了不同Cr3C2加入量对镍基碳化钨熔覆层显微组织、横截面微观硬度、耐蚀性及耐磨性的影响。结果表明,Cr3C2使熔覆层质量得到改善,涂层中花状、鱼骨状枝晶组织基本消失,组织主要由浅白色块状、黑色不规则块状、浅黑色菱角状组织以及未熔WC颗粒组成。当Cr3C2加入量为10%时,组织中裂纹、气孔等缺陷基本清除,未发现WC的聚集和桥接,熔覆层显微硬度及耐蚀性均有所提高,硬度分布更加均匀。干滑动摩擦摩损试验时,熔覆层表面磨粒磨损特征的犁沟相对较浅,没有WC粒子脱落现象。

Effect of adding Cr3 C2 on microstructure and properties of Ni/WC cladding layer

The effect of Cr3C2content on the microstructure,cross section microhardness,corrosion resistance and wear resistance of Ni/WC cladding layer was studied.The results show that incorporation of Cr3C2 can improve the quality of the cladding layer.The microstructure of the composite coating is mainly light white massive,black irregular massive,light black caltrop shaped structure and undissolved WC particles.Contrarily,the flower-shaped,fishbone dendrite microstructure in the coating is vanished with the adding Cr3C2.When Cr3C2 content is increased to 10wt%,the cracks,gas pores in the coating are almost completely disappeared,while the hardness and corrosion resistance are improved.No WC gathering and bridging phenomenon in the microstructure is found.The dry sliding friction and wear experiment show that the furrow on the surface of cladding layers is relatively light and no WC particle shedding phenomenon is found.