Preparation And Wear Resistance Of Honeycomb Space Structure ZTAp/high Manganese Steel Matrix Composites

As a traditional wear-resistant materials,high manganese steel has been widely used because of its good work hardening ability in the field of wear-resistant materials.High manganese steel in high impact and stress conditions can quickly produce work hardening,thereby improving the wear resistance of materials.However,the relatively low work hardening degree hinders the wear resistance to full play when the stress conditions is lower.Ceramic particles reinforced metal composites is one of the most attractive wearable materials which exhibits excellent wear characteristics due to the high hardness of the ceramic and the good toughness of the metal.In recent years,a lot of research on ceramic particles reinforced metal matrix composites have been done involving preparation and performance,which achieved some achievements and some of them have been applied in production.Compared with the general high manganese steel,the high manganese steel matrix adding ZTA particles revealed much higher wear resistance under low stress and longer service life.Therefore,it is of great practical significance to study the preparation and performance of ZTA particle reinforced high manganese steel matrix composites.In this paper,the ZTAp/high manganese steel matrix composites with honeycomb space structure is prepared by ordinary sand casting.The effect of adding pore-forming agent and alloy powder(Fe-based low-melting alloy and reduced iron powder)on casting infiltration in preform is investigated.The results show that the addition of reduced iron powder can obtain composite material with better composite effect.When 60%,50%,40%,30%and 20%reduction of iron powder are added to the preform,the volume fraction of ceramic particles in the composite zone is about 24.3%,26.7%,29.1%,32.8%and 34.2%,respectively.The hardness and compressibility of ZTA reinforced high manganese steel matrix composites are tested.Compared with the matrix,the macroscopic hardness of the composite zone is obviously improved,and the hardness of the composites is also increased as the volume of the composite particles increases.When the particle volume fraction of ZTA is 29.1%,the hardness of the composite zone can reach 43.7HRC.Although the compressive strength of the composites is lower than the high manganese steel matrix,the yield strength of the composites is higher than the high manganese steel.The crack pattern can be seen from the crack morphology after compression.Good interface bonding strength can ensure that the particles don't easily fall off from the substrate,and to a certain extent to prevent the expansion of the crack,thus improve the performance of the material.The abrasive wear and the three-body abrasive wear test of composite materials with different volume fraction is tested.The impact abrasive wear experimental results show that the wear resistance of the composites with the volume fraction of 24.3%is the best.However,as the particle volume fraction increases,the abrasive wear resistance of the composite material is reduced.Meanwhile,the wear resistance of the composite material is higher than that of the metal matrix in the three-body wear test.