Conclusions
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1.
It has been established that the HSW of compacts produced by pressing in dies is characterized by a pronounced anisotropy of densification, manifesting itself in preferential diametral densification, i.e. densification in the transverse direction, which brings about an equalization of density within the compacts.
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2.
It has been found that the densification of compacts from hard-alloy powder mixtures in the HSW pressure range investigated (1–20 tons/cm2) is linked with deformation of particles of the powder composites. The process involves the second pressing stage, but occurs in two distinct phases: In the first phase (at p < 9.5–12 tons/cm2) densification proceeds rapidly and is accomplished mainly through deformation of the binder metal — cobalt, while in the second phase densification slows down, largely due to deformation of a “carbide skeleton.”
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3.
It is shown that the compressibility in each of the two phases is described by a logarithmic equation. The maximum attainable compact density decreases with increase in the amount of the carbide component in the mixture.
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Translated from Poroshkovaya Metallurgiya, No. 9 (177), pp. 21–26, September, 1977.
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Mikhailenko, G.P., Chernyi, Y.F. Compressibility of compacts from hard-alloy powder mixtures in hydrostatic working. Powder Metall Met Ceram 16, 672–676 (1977). https://doi.org/10.1007/BF00791465
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DOI: https://doi.org/10.1007/BF00791465