[en] Distinctive properties of strain hardening and failure of powder iron were studied as compared with compact material. To analyze strain hardening powder iron specimens with different porosity (6-24%) and cast armco iron were used. Coordinates σ=f (e¹¹²) (where σ-stress, e-effective strain) show that hardening curves with an increase of the porosity arrange one under another and have no breaks typical of the compact material. The deviation is stated to be due to loosening of the material in the process of plastic deformation. Loosening is followed by a respective increase (approximately 4%) of porosity. Repeated standardization of the hardening curves taking into account the factor of the material loosening during deformation leads to their complete coincidence. It is stated that regularities of the powder iron strain hardening with allowance for its initial porosity, strain concentration and loosening during deformation are comparable between themselves and compact material

No abstract available

No abstract available

[en] Kinetics of erosion processes and formation of coatings under Conditions of mechanized induction electrospark alloying is investigated. Alloying chapacteristics are related to electrode material porosity. Possibility of management by formation of alloying layer by the way of change of electrode material structure is shown. Formation of secondary structure on the working surface of electrode during electrospark alloying is noted

[en] Magnetic properties and dispersity of powders prepared by reduction of Fe, Ni, and Co from a mixture of oxalates in carbonaceous gas media have been studied using Moessbauer and small angle x-ray analyses and magnetic mapping. The influence of dispersity, morphology, and phase composition of the powders on their magnetic characteristics has been shown