Effects Of Alloy Powder On WC/Steel Base Surface Composite Structure And Impact Abrasive Wear Performance

With the development of modern industry, WC/steel base surface composite material has gradually become a high ratio of performance new materials. But in the process of research and application, it still exist some problem such as impact abrasive wear performance was low. The Paper first simple analyses the impact of abrasive wear of WC/steel surface composite materials. Then it design organization and structure of materials, optimized the preparation technology parameters, study the fabrication process of WC particles enhance high chrome base surface composite. Test and analysis the impact of the material properties and wear abrasive wear mechanisms. The paper studies the effects of alloy powder particles to WC/steel base surface composite material. The effects of alloy powder for WC/steel base surface composite structure and interface and hardness and impact abrasive wear performance.In paper, the high-carbon chromium steel substrate surface composites hammer containing different volume fractions of WC particles were fabricated successfully by V-EPC infiltrating casting process. Macroscopic interface is metallurgical bonding and the transitional zone is gentle for use particle size for40to60mesh WC particles. The result shows that:(1) Added Ni60WC25in layer may cause pearlite, residual austenite, martensite and carbides appeared in matrix. When improve the volume fraction of Ni-based alloy powder, Ni element will be solid solution into carbide and led the mesh carbide change into massive carbide.(2) On the paper experiment condition, the volume fraction of5%Co in composite layer has more carbide which contains high percentage of tungsten element than the volume fraction of2%Co in composite layer. When improve the volume fraction of Co powder, Co element will be solid solution into carbide. Added Co in layer may cause pearlite, martensite and carbides appeared in matrix. Added to some volume fraction Ni60WC25and Co in composite layer, Composite layer organizational changes can be seen for macro hardness change of material:from the composite material of base material to surface, first increased and then decreased, and the composite layer of average hardness enhanced almost twice as much.The results show that, adding different volume fraction Ni60WC25and Co powder in composite layer are less wear rate of high chromium cast iron sample. Added2%Co in composite layer has lowest volume wear rate when the materials of the smaller (0.5J and1J) impact energy. Added5%Co in composite layer has lowest volume wear rate when the materials of the bigger (2.5J) impact energy.The mechanism of impact abrasive wear performance is the protecting effect of the surface WC particles on the matrix and the supporting effect of the matrix to WC particles, and the abrasive breaks down packed into matrix also effects of the volume wear rate. The main impact of abrasive wear was wear when the impact was low; the main impact of abrasive wear were wear and impact when the impact was high.