Abstract
1. With increasing particle size of the powder fractions, microhardness of steel 10R6M5 increases, microhardness of steel R0M2F3 decreases; this has to do with the difference in phase composition of these steels. The structure of steel 10R6M5 obtained from powder of the coarse fractions (>250 μm) consists chiefly of martensite and austenite; the structure of the fine fractions consists of δ-ferrite. The structure of steel R0M2F3 does not depend on the powder size, and it is austenite and martensite; the latter was not detected by the method of optical metallography. The carbide phase in the investigated steels does not depend on the size of the fractions and consists of carbides MC and M6C (steel 10R6M5) and MC and M2C (steel R0M2F3). 2. After annealing and subsequent heat treatment differences in the structure and properties of powdered steels 10R6M5 and R0M2F3 were not detected, nor was any effect of the size of the fractions on the properties discovered. 3. Specimens obtained by compacting by rolling of powder of different fractions are close to each other in properties and structure; differences in the properties of the initial powders of different fractions disappear after rolling.
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