High velocity compaction of ferrous powder

Water atomized pure iron powder was pressed by high velocity compaction technology. The influences of impact velocity on green density, shock wave, compacting and ejection forces, radial springback and strength of compacts were studied. Cross-section images of green compacts were observed by scanning electron microscopy (SEM). A computer controlled universal testing machine was used to measure the green strength of compacts. The results show that impact velocity intensively affects the green density of specimen. As impact velocity increases, the green density and the strength of compacts increase gradually, especially the green strength. In addition, the compacting force and the actuation duration of shock wave increase obviously with the augment of impact velocity, which leads to densification of powder body. No specific relation was found between the ejection force, the radial springback and the impact velocity.

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