Research On WC Reinforced Cu-Ni-Mn Metal Matrix Wear-Resistant Materials For Remanufacturing Applications

Every year,the scrapping of parts and components causes huge economic losses to the national economy.The use of remanufacturing technology for repair and reuse can effectively reduce resources and energy waste,and has major application prospects and development potential.In this paper,copper-nickel-manganese alloy was used as metal matrix and cast tungsten carbide was added as reinforcement particles.The bonding interfaces between the reinforcing phase and matrix,the surfacing layer and the substrate were both analyzed.The metal matrix microstructure of welding layer was studied and the distribution of the cast tungsten carbide particles was observed.The wear-resistance properties were characterized.A new kind of wear-resistant materials and preparation method of coatings for remanufacturing applications are researched.Two types of cast tungsten carbide?30-60 mesh and 100-150 mesh?were selected,while the content of cast tungsten carbide particles in the flux-cored wire was considered,8 groups of flux-cored wires were prepared.After the arc cladding process,the cast tungsten carbide was completely melted in the surfacing layers with100-150 mesh tungsten carbides.While the surfacing layers of the other samples all can find tungsten carbides.And one of these samples exists serious particle segregation.In the others,the tungsten carbide volume fractions were 37.5%,39.6%,and 59.6%.As the volume fraction of the reinforcing phase increases,the distribution of the reinforcing phase particles becomes more uniform.The microstructure of the surfacing layer was analyzed and it was found that the tungsten carbide was well bonded to the metal matrix.There were no cracks,pores and impurities in the interfaces.In addition,the F₃W₃C phase generated in the bonding interface between the surfacing layer and the steel substrate,and formed fishbone eutectic carbide structure.Metallurgical bond with good bonding strength formed between the surfacing layer and the steel substrate.The primary phase in the as-deposited Cu-Ni-Mn metal matrix is a dendritic structure with a hardness of 124.1HV_0.3.With the Ni and Mn elements solid solution,the Cu turns into?-Cu which with FCC crystal structure.The two-body wear-resistance of the hardfacing layer was tested.The relationship between the change of WC contents and the failure mechanism has been analyzed.In the test,the silicon nitride is used as abrasive grain,the wear failure mechanisms are adhesive wear,abrasive wear,and fragmentation of tungsten carbide particles.Furthermore,the elemental analysis had been taken on the wear surface,the oxidation also be observed and the oxidation products were NiO and CuO.