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    Densification by cold re-pressing of low-carbon managese steels

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    Publication date
    2005
    Author
    Mitchell, Stephen C.
    Bäumgartner, F.
    Keyword
    Density
    Cold Re-Pressing
    Surface Hardening
    Master Alloy
    Rights
    © 2005 IMR SAS. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    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.
    URI
    http://hdl.handle.net/10454/1022
    Citation
    Mitchell, S.C. and Bäumgartner, F. (2005). Densification by cold re-pressing of low-carbon manganese steels. Powder Metallurgy Progress. Vol. 5, No. 4, pp. 234-242.
    Link to publisher’s version
    http://www.sav.sk/index.php?lang=en&charset=ascii&doc=publish-journal&journal_no=18
    Type
    Article
    Collections
    Engineering and Informatics Publications

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