Yes / Obtaining closed porosity, i.e. densities >7.4 g.cm-3, is a major target in PM development. To increase density, strength and surface hardness of low-carbon PM steels: cold and warm compaction, sintering and slow cooling through the ferrite transformation region, followed by cold repressing and surface hardening were investigated. The slow cooling resulted in soft, ferritic, microstructure amenable to cold resizing. Repressing at 700-900 MPa densified the samples to ~7.6 g.cm-3. Mechanical properties, after repressing and surface hardening, are characterised by appreciable plasticity following macroscopic yielding at stresses of 400-1200 MPa. Reference is made to possible further increases in strength by incorporation of small additions of clean, fine Mn containing master alloy into the powder mix. Results were verified industrially on hollow cylinders made from Fe-0.5Mo or Fe-1.5Cr-0.2Mo base powders.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/1022 |
| Date | January 2005 |
| Creators | Mitchell, Stephen C., Bäumgartner, F. |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2005 IMR SAS. Reproduced in accordance with the publisher's self-archiving policy. |
| Relation | http://www.sav.sk/index.php?lang=en&charset=ascii&doc=publish-journal&journal_no=18 |
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