Free upsetting of heated porous cylindrical specimens
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When compacts with ρ = 90–92% are upset, they become more compact up to some critical degree of axial deformation εz, beyond which the mean density in volume practically does not increase, or even decreases. In compacts with ρ = 78–82% density increases in upsetting up to the instant of the appearance of cracks on the lateral surfaces. The permissible degrees of transverse deformation corresponding to the critical values of εz lie within the limits 25–35%.
Reduction of the ratio of the height of the compact to its diameter increases compaction and decreases radial deformation for the same values of εz. Deformability of compacts before failure increases with increasing ratio of the height of the specimen to the diameter and with its increasing initial density.
KeywordsCompaction Lateral Surface Density Increase Initial Density Cylindrical Specimen
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- 1.Yu. G. Dorofeev, Dynamic Drop-Forging of Porous Powdered Compacts [in Russian], Metallurgiya, Moscow (1977).Google Scholar
- 2.Yu. G. Dorofeev and V. V. Sinel'shchikov, “Special features of deformation and cracking of heated cylindrical powdered compacts,” Poroshk. Metall., No. 1, 25–30 (1980).Google Scholar
- 3.Kh. A. Kun, “Basic principles of the drop-forging of powdered compacts,” in: The Powder Metallurgy of Special-Purpose Materials [in Russian], Metallurgiya, Moscow (1977), pp. 143–158.Google Scholar
- 4.Kh. V. Antes, “Production technology and properties of powdered forgings,” in: The Powder Metallurgy of Special-Purpose Materials [in Russian], Metallurgiya, Moscow (1977), pp. 159–197.Google Scholar
- 5.Yu. G. Dorofeev, “Density distribution in powdered compacts in free upsetting,” Poroshk. Metall., No. 5, 6–11 (1975).Google Scholar
- 6.G. E. Goncharenko, E. P. Filipovich, and E. A. Doroshkevich, “Investigation of the process of upsetting of sintered compacts,” Metallurgiya, No. 8, 151–155 (1976).Google Scholar