Friction And Wear Behaviours Of High Speed Steel Bionic Surfaces

Wear can cause component failure, and the mechanical equipments have faced this problem.High speed steel has higher hardness and strength, and it is the main material for cutting tool andmould manufacturing. Higher wear resistance of high speed steel has important significance forimproving cutting tool and mould life. The bionic provides a new way for the design of wearresistance material. In this paper, the high speed steel specimens were machined by laser meltingtechnology and laser cladding technology. The wear resistance of high speed steel was improved.In this paper, the convex textures, dimple textures, stripe textures and grid textures weredesigned. The relationship between laser parameters and the texture dimension was studied. Theconvex textures and dimple textures were machined by laser melting technology. The Ni base WCpowder convex textures, Al2O3powder stripe textures, Al2O3powder grid textures, Ni base WCpowder stripe textures, and Ni base WC powder grid textures were machined by laser claddingtechnology. By metallographic test and hardness test for texture surfaces, the organization andstructure were observed and analysed. The friction and wear test of specimens with differenttextures were carried out. The effect of texture dimension and space on wear and frictioncoefficient was studied.The texture dimension increased with laser current and pulse width with a linear relationship.It showed that the texture grain refinement was achieved by metallographic test. It showed that thehardness of texture surface increased, compared with base material. The hardness of texture surfaceincreased with texture dimension. Compared with smooth specimens, the textured specimens had alower wear. Generally, the specimens machined by laser cladding technology had a better wearresistance than the specimens machined by laser melting technology. The specimens with dimpletextures had a better wear resistance than the specimens with convex textures. For the specimensmachined by laser cladding technology, the specimens with Al2O3powder stripe textures had thebest wear resistance, followed by specimens with Al2O3powder grid textures, specimens with Nibase WC powder stripe textures, specimens with Ni base WC powder grid textures and specimenswith Ni base WC powder convex textures.