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Volume 2, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 1109 - 1115
Section Micro-Structural Effects
DOI 10.1051/dymat/2009155
Published online 15 September 2009

DYMAT 2009 (2009) 1109-1115
DOI: 10.1051/dymat/2009155

The effect of impact compaction on surface quality of powder discs

P. Jonsén1, H. Häggblad1 and M. Nishida2

1  Luleå University of Technology, 971 87 Luleå, Sweden
2  Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Japan


Published online: 15 September 2009

Abstract
Powder compaction by impact where high strain-rates occurs in the powder is attending an increasing interest. Impact compaction or high velocity compaction (HVC) is a production technique with capacity to significantly improve the mechanical properties of powder metallurgy (PM) parts. The HVC experiments were performed using a laboratory machine with a hydraulically driven hammer. This machine has maximum impact energy of 4 kJ. The powder materials used for the investigation were pre-alloyed water atomized iron based powders. Profile measurements of HVC and conventionally compacted (CC) 25 mm circular discs have been performed with a Wyko NT1100 using vertical scanning interferometry (VSI). For comparable densities the HVC discs have a significantly flatter and smoother upper surface (impact face) compared to CC discs.



© EDP Sciences 2009


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