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As a rule the quality of parts made of powder materials is evaluated by the criteria of structural strength, which very often do not reflect their actual operating capacity. This is connected not only with the scale factor, because specimens of rather large size are required for correct determination of crack resistance, but also with the special features of porous steels with a nonuniform concentration. The present paper concerns results of a study of the fatigue and wear resistances of metastable steel -copper pseudoalloys that are copper-infiltrated powder steels.

The industries of developed countries widely use alloy steel copper pseudoalloys. In copper-infiltrated steels the strength, ductility, and wear resistance increase due to the creation of a structure with a greater proportion ofmetastablc austenite. Such a structure can be obtained by a substantiated choice of the composition, concentration inhomogeneity, and appropriate heat-treatment regime of the material. The present paper is devoted to the decomposition of supercooled attstenite in chromium-nickel steel copper pseudoalloys with an optimum distribution of the alloying additives.

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