Recrystallization diagram of sintered iron produced by dynamic hot pressing

Dorofeev, Yu. G.; Gasanov, B. G.

doi:10.1007/bf00795135

Cited by 2 publications

(2 citation statements)

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“…One of the most effective processes of powder metallurgy, providing dense (almost non-porous) workpieces (including complex shapes), is hot forging of porous preforms [1–7]. In addition to the ultimate density that this technology can provide, the materials obtained with its use have other specific features, in particular, hereditary fine grain size, which favourably distinguishes it from the methods of foundry processing or high-temperature liquid phase sintering (in case of using powder metallurgy technology).…”

Section: Introductionmentioning

confidence: 99%

“…In the practice of powder metallurgy, the first technological approach uses the scheme of closed volumetric deformation, which provides for additional re-pressing of porous workpieces by upsetting them in a die with a minimum transverse material flow (realised only by filling the technological gap between the wall of the die and the heated workpiece) has found much wider application [1,7,11].…”

Section: Introductionmentioning

confidence: 99%

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Finite element simulation of different deformation modes for powder hot forging

Baglyuk

Kyryliuk

2022

Powder Metallurgy

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Comparative results of numerical simulation of the process of hot forging of porous preforms with an axial hole for two deformation schemes are presented: in a die with a flash groove on the inner surface of the forged workpiece cavity and in a closed die. A significant difference in the nature of the evolution of the distribution of deformations and density over the crosssection of the workpiece for the two considered schemes is noted. It is shown that forging in a die with an open volume provides significantly higher degrees of material deformation during forging compared to closed forging, which should lead to an increase in the quality of the structure and final properties of the forged material.

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