ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Warm compaction is a low cost process to make high density and high performance ironbase powder metallurgy parts. Based on results obtained from the dynamic compacting curve,ejection force curve, X-ray diffraction, micro-hardness of iron powder, friction condition andlubricant properties, densification mechanism of warm compaction can be drawn. In the initial stage,the rearrangement of powder particles is the main factor. It contributes more in the densification ofwarm compaction than that in cold compaction. However, in the later stage, the plastic deformationof powder particles is the primary factor. The increase in plasticity at high temperature canharmonize the secondary rearrangement of powder particles. During the compaction, the polymerlubricant has great contribution to the densification of the powder, since it improves the lubricatingcondition and effectively decreases the friction in the forming process and thus enhances thecompact density. The dynamic compacting curve of warm compaction can be divided into threephases. The first is the particle rearrangement dominant phase; the percentage of particlerearrangement in warm compaction is higher than that in cold compaction by 15-31%. The secondis the elastic deformation and plastic deformation dominant phase. The third is the plasticdeformation dominant phase. The study of the powder densification mechanism can directengineers in designing and producing warm compaction powders for high density parts
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2699.pdf
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