Conclusions
Compacting by hydrostatic pressure of the powder blank preshaped by vacuum sintering to a density of 0.88–0.90 of the theoretical value makes it possible to obtain by hot pressing without a metallic sheath rods with circular and shaped sections with the density of the material close to 100%.
The properties of the hot-pressed high-speed steel of the 10R6M5-MP grade produced from powder blanks compacted by hydrostatic pressure without the metallic sheath are higher than similar properties of R6M5 steel produced by the standard method and are not inferior and, in some case, are even superior, to the properties of a similar steel quoted in literature sources and produced by hot gas static pressing followed by forging or hot extrusion of the powder in the capsules.
Use of the hot-pressed shaped rods without the metlalic sheath for producing cutting tools makes it possible to increase its strength 1.6–2.0 times in comparison with tools of 10R6M5-MP high-speed steel and the steel produced by the standard method. The coefficient of utilization of the metal may increase to 0.7–0.8.
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Translated from Poroshkovaya Metallurgiya, No. 10 (346), pp. 17–21, October, 1991.
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Spuskanyuk, V.Z., Tyutenko, V.S., Darda, Y.A. et al. Heat treatment and properties of 10R6M5-MP high-speed steel produced from gas-dispersed powder at high hydrostatic pressures. Powder Metall Met Ceram 30, 824–827 (1991). https://doi.org/10.1007/BF00795849
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DOI: https://doi.org/10.1007/BF00795849