The consolidation of high density and high strength structure of powder high-speed steel is investigated and optimal operating parameters are defined. The rapidly solidified high-speed steel powder was consolidated by the electric discharge sintering. It was found that the density and strength of powder high-speed steel essentially depends from high voltage electrical discharge parameters and applied mechanical pressure. Powder particles of highspeed steel are redistributed in the compact volume due to magnetic pressure of discharge current pulse and the external mechanical pressure. The distribution of magnetic pressure is defined by the distribution of a current density in the powder compact. The powder densification process has wave nature in the electric discharge sintering. Joint influence of external mechanical and magnetic pressure forms some different zones with cumulative collapse of pores in volume of consolidated material. We determined the dimensionless criteria defining parameters of cumulative collapse of pores during the electric discharge sintering.
展开▼
