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Green Body Behaviour of High Velocity Pressed Metal Powder

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Abstract:

High velocity compaction (HVC) is a production technique with capacity to significantly improve the mechanical properties of powder metallurgy (PM) parts. Several investigations indicate that high-density components can by obtained using HVC. Other characteristics are low ejection force and uniform density. Investigated here are green body data such as density, tensile strength, radial springback, ejection force and surface flatness. Comparisons are performed with conventional compaction using the same pressing conditions. Cylindrical samples of a pre-alloyed water atomized iron powder are used in this experimental investigation. The different behaviour of HVC-pressed green bodies compared to conventional pressed green bodies are analysed and discussed. The HVC process in this study resulted in a better compressibility curve and lower ejection force compared to conventional quasi static pressing. Vertical scanning interferometry (VSI) measurements show that the HVC process gives flatter sample surfaces.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

289-292

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.289

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Online since:

January 2007

Authors:

Par Jonsén, Hans Åke Häggblad, Lars Troive, Joachim Furuberg, Sven Allroth, Paul Skoglund

Keywords:

Compressibility, Green Strength, High Velocity Compaction, Metal Powder, Springback

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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