Deformation behavior of stainless steel particles under compressive load
Summary:
Die-compaction of metal powders, for the purpose of
densification and shape forming, is one of the most important
processes in the powder metallurgical industry. Our main
interest is in the density of compacted powders, which
affects the
shrinkage of compacted powders during sintering and in
turn the dimensional precision and strength of sintered
compacts.
To describe powder densification
behavior during die-compaction, many theoretical, semi-theoretical
and empirical compaction equations have been proposed
[1], most of which express the correlation between the
average density of compacted powders and compacting
pressure. These equations are useful for predicting the
density of compacted powders for simple shapes formed
by conventional die-compaction, in which only a narrow
density distribution is seen. Recent developments in computer
numerical control (CNC) pressing technology, however,
have enabled the die-compaction of compacts with very
complex shapes. In general, compacted powders of complicated
shapes show wide density distributions, making conventional
compaction equations inapplicable. As a result, the dimensions
and the shapes of the press dies as well as of the processing
conditions have up to now been optimized by trial and
error, since the density of compacts affects shrinkage
and dimensional precision
Format:
Pages :6
Size: 248 kb
Author :H. Hashimoto , Z.M. Sun, T. Abe
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