Impact Abrasive Wear Of Ceramic Particles Architectures Toughened ZTA/Steel Composites

Traditional ceramic particle reinforced metal matrix composites have excellent three-body abrasive wear resistance since the ceramic particles disperse in the matrix.However,due to the low toughness of the material itself,the abrasive wear resistance under impact conditions is poor.In this paper,ZTA?zirconia toughened alumina?ceramic particle reinforced 40Cr steel matrix composite?space structure composite?was prepared by extrusion casting which has a three-dimensional interpenetrating network spatial structure including ZTA particle reinforced 40Cr steel composite zone and 40Cr steel matrix zone.The effects of composite material zone?composite zone?volume fraction,property of steel matrix microstructure and ZTA/steel interface on the impact abrasive wear performance of space structure composites were studied systematically.The wear mechanism of space structure composites was explored.The impact abrasive wear resistance was compared among the space structure composites with 35%,50%,and 65%volume fractions in composite zone,40Cr steel and uniformly distributed ZTA particle reinforced 40Cr steel composites?uniformly distributed composites?.The results show that the wear rate of the composites with spatial structure increases first,then decreases and then increases with the increase of the volume fraction of the composite zone.The wear rate of composites with 50%volume fraction in composite zone is the lowest,and its wear resistance is 21.1%higher than that of the pure 40Cr matrix and 78.5%higher than that of the composite with uniformly distributed ZTA particles.The effects of different heat treatments on impact abrasive wear resistance of space structure composites with 50%volume fraction in composite zone were investigated.After the heat treatment,the microstructure and hardness of the 40Cr steel were changed.Three different microstructures of martensite?522.7HBW?,troostite?397.5HBW?,pearlite+ferrite?230.3HBW?were obtained respectively.As the hardness of the 40Cr steel matrix increases,the wear rate of the composite decreases.The wear resistance of martensite matrix composites is 32.8%higher than that of troostite composites and 166.3%higher than that of ferrite+pearlite composites.According to this rule,the wear resistance of the composite material with double matrix space structure was further studied.Among them,the steel matrix in the composite zone became high carbon low chromium alloy steel,and the matrix area was still 40Cr steel.The results indicated that under the same heat treatment condition,the wear resistance of the double matrix composites is 21.6%higher than that of space structure composites with 40Cr in both matrix and composite regions.Therefore,the high hardness of the steel matrix is beneficial to improve the wear resistance of the composite material of the space structure,and the wear resistance of the double matrix composite is higher than that of the single matrix.The wear mechanism analysis shows that with the increase of volume fraction of matrix zone,the compressive strength and plasticity of space structure composites increase,and the matrix absorbs more impact energy,so the wear resistance tends to increase.However,the role of ZTA particles resisting abrasive impact and protecting the matrix is weakened.Therefore,there is an optimum volume fraction value in the composite zone.The higher the hardness of the matrix,the stronger the support effect of the matrix on ZTA particles during impact abrasive wear,and the stronger the protective effect of ZTA particles on the matrix,so the impact abrasive resistance of composites become better.The impact wear?no abrasive?performance of 3D interpenetrating space structure composites was investigated.When the volume fraction of composite zone was 35%,50%and 65%,the wear rates were 4.7×10^-3cm³/h,3.4×10^-3cm³/h and1.0×10^-3cm³/h respectively.As the volume fraction of the composite zone increases,the wear rate decreases,and the main failure mechanism of the impact wear is fatigue wear.For the impact wear performance under different heat treatments,corresponding to the hardness,the higher the matrix hardness,the better the wear resistance.The results of this research provide a theoretical basis for the structural optimization design and wear resistance improvement of ceramic particle reinforced metal matrix composites.and promote the application of wear-resistant metal matrix composites to the field of strong impact wear.