高速钢激光熔覆Ni基WC条纹表面的磨损特性

Wear Characteristic of Laser Cladded Ni-based WC Stripe Surface of High Speed Steel

在高速钢试件表面采用激光熔覆制备Ni基WC条纹,研究了试件的显微组织和显微硬度。分别对高速钢试件和Ni基WC熔覆条纹试件进行了摩擦磨损试验,并通过扫描电镜观察了磨损表面的形貌。结果表明:与高速钢试件相比,Ni基WC熔覆条纹试件的磨损量降低。Ni基WC熔覆条纹表面以磨粒磨损机理为主。WC硬质颗粒的弥散强化、熔覆条纹的散热作用以及熔覆条纹与间隔材料之间的软硬交替作用,有助于改善高速钢Ni基WC熔覆条纹试件表面的耐磨性。

Ni-based WC stripes were fabricated on high speed steel(HSS)specimen surface by laser cladding technology.The microstructure and microhardness of the specimens were studied.The friction and wear tests of HSS specimens and Nibased WC cladded stripes specimen were carried out.The wear surface’s morphology was observed by SEM.The results show that the wear mass loss of specimens with Ni-based WC cladded stripes is lower than that of HSS specimen.The wear mechanism of Ni-based WC cladding stripe surface is mainly abrasive wear.The wear resistance improvements for high speed steel specimens with Ni-based WC cladded stripes are caused by the following factors,dispersion strengthening of hard WC particles,heat dissipation effect of cladded stripes and hard and soft alternation between cladding stripe and interval material.