Abstract
The influence of particle characteristics on the sinterforging process has been studied by measuring forging force, forged density, and Charpy impact energy of reduced and airand water-atomized iron powders. Powder type, lateral flow during forging, and particle size all have a considerable effect on impact properties of powder forgings. A consistent explanation for all these influences can be given when it is assumed that the fracture mode, i.e. ductile or intergranular brittle, is closely related to the amount and distribution of non-metallic inclusions and/or oxide films present on the surface of powder particles.
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