Preparation And Properties Of Iron Based Composite Reinforced By Stainless Steel Fibre

Much progress has been made in preparation and properties of metallic matrix composite these years, but little study focused on the environment compatibility of this kind of materials. In this study, composition of metal base composite had been simplified taking consideration of environment effects, while mechanical properties didn't change too much. Fe-Fe composite was designed by powder metallurgy using mixture of rustless steel and iron powder for recycling, meanwhile general mechanical behavior should be achieved.Iron and steel base composite reinforced by 316L fibre has been successfully prepared using powder metallurgy. With analysis of orthogonal test, the influences of technology parameter on the microstructure and properties of iron matrix composites have been studied. With the property targets such as density, hardness, tensile strength, frictional wear capacity, friction coefficient, a better technology has been found. The factors affecting the microstructure, density, mechanical properies and friction properties such as fiber content, initial pressure and sintering temperature were elucidated.The resuit of experiment showed that the properties of composite material were better,when fiber content was 3%-5%, initial pressure was 500MPa-700MPa, and sintering temperature was 1000℃-1200℃. Results of orthogonal test showed the optimized processing parameters as followed: fibre content,initial press and sintering temperature were 5%,700Mpa and 1000℃respectively for iron base composite, and 7%,700Mpa and 1100℃respectively for rustless steel base composite.Using powder metallurgy, tensile strength, hardness and wear resistance property of steel fiber base iron composites prepared was high much. When the optimized processing parameters as followed: density,hardness,fiber content,initial pressure and sintering temperature were 7.015-7.217g/cm3, HRB60-72, 3%, 500MPa, and 1200℃, the tensile strength of composite material could achieve 228.63MPa, which was higher that of pure iron powder 35.8MPa. With the method of powder metallurgy, the effect of steel fiber base steel composite prepared was not obvious. When density was 6.7-7.0g/cm3, hardness was HRB70-90, wear resistance property was worse, when fiber was 7%, initial pressure was 500MPa, and sintering temperature was 1200 ℃, tensile strength of composite material was 176.25 MPa, which was a little higher than that of pure steel powder.