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Results are presented for the dependence of ultimate strength on electro-contact compaction parameters for an iron-graphite composite based on sprayed and reduced powders. A production regime is determined for electro-contact compaction providing the formation of powder steel with maximum ultimate strength. The dependence of ultimate strength on residual porosity is considered. [ABSTRACT FROM AUTHOR]

A dependence is given for porosity of iron powder and iron-graphite composite based on atomized and reduced powders on different electric-contact compaction regimes. A dependence is determined for the amount of bonded carbon on process regime. Limiting processes are established during formation of powder steel by electric-contact compaction. [ABSTRACT FROM AUTHOR]

Diffusion of carbon atoms (ions) in an iron matrix based on crystallography is considered. Structures are determined for a chemisorbed carbon layer and its concentration. The carbon diffusion coefficient in γ-Fe during electrocontact compaction is calculated. The elementary act of C movement into neighboring iron octahedral interstices is considered as a basic homogenization mechanism. Intensification of C diffusion in γ-Fe is explained by the effect of an external electric field on the degree of carbon atom ionization in the iron crystal lattice interstices. [ABSTRACT FROM AUTHOR]