Effect of carbon on mechanical properties of powder-processed Fe-0.35%P alloys

摘要

The present paper records the results of mechanical tests on iron-phosphorus powder alloys which were made using a hot powder forging technique. In this process mild steel encapsulated powders were hot forged into slabs, hot rolled and annealed to relieve the residual stresses. These alloys were characterized in terms of microstructure, porosity content/densification, hardness and tensile properties. Densification as high as 98-9% of theoretical density, has been realized. Microstructures of these alloys consist of single-phase ferrite only. Alloys containing 0-35 wt% P, such as Fe-0-35P-2Cu-2Ni-lSi-0-5Mo and Fe-0-35P-2Cu-2Ni-lSi-0-5Mo-0-15C show very high strength. It was observed in this present investigation that, the alloying additions, such as Si, Mo, Ni, and C to Fe-P based alloys caused increase in strength along with reduction in ductility. Cu reduces porosity of Fe-P alloys. Alloys developed in the present investigation were capable of hot working to very thin gauge of sheets and wires.