Densification Mechanism and Wear Resistance of Fe Matrix Surface Composite Produced by Cast Sintering Technology

The microstructure and phase composition of the composite on gray cast-iron HT200 surface prepared by cast sintering technology was analyzed by using SEM and XRD.The elementary distribution between surface composite and matrix metal was analyzed by using EDS.The wear-resistance of Fe matrix composite surface was examined.The densification mechanism was analyzed.The results show that the σ-(FeV) phase in the compacts was decomposed into α-Fe and V during the cast sintering process.The high exothermic reactions of the V8C7 phase and the thermal flow transferring from the liquid iron to the compacts guaranteed the compacts densification during sintering,the composite composed of micro V8C7 particles and α-Fe phase could be obtained.The strengthening phase particles combined with the matrix well,the composite and the gray cast-iron was metallurgical binding.The wear-resisting property of the surface Fe matrix composite increased by 44.5 times than that of quenched steel under the condition of heavy load and dry sliding friction.