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Behaviour of master alloy during sintering of PM steels: Redistribution and dimensional variations
KTH Royal Institute of Technology.
KTH Royal Institute of Technology.
KTH Royal Institute of Technology.
Höganäs AB.
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2015 (English)In: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 58, no 2, p. 133-141Article in journal (Refereed)
Abstract [en]

The addition of alloying elements in low alloyed PM steels in the form of a master alloy gives the advantage of introducing oxidation sensitive but less expensive elements and also allows manipulation in composition adjustment to achieve desired properties. In this work, interrupted sintering trials of the Fe-2MA-0.5C (%) (MA=Cu based master alloy) are performed. The behaviour of the liquid forming master alloy, for instance in terms of liquid phase formation, alloying element redistribution and effect on the dimensional changes, is investigated. The results show that master alloy particles melt over a range of temperature, which is also supported by the thermodynamic calculations. The low swelling in the master alloy system, compared to a reference system of Fe-2Cu-0.5C, is attributed to the progressive melting of the master alloy. The mean diffusion distance of Cu in Fe at the interparticle boundaries is 5.8 μm after 34 min of isothermal holding. © 2015 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute.

Place, publisher, year, edition, pages
2015. Vol. 58, no 2, p. 133-141
Keywords [en]
Cu redistribution, Diffusion measurements, Dilatometry, Liquid phase behaviour, Master alloy, Thermo-calc
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12781DOI: 10.1179/1743290114Y.0000000117Scopus ID: 2-s2.0-84939205464OAI: oai:DiVA.org:ri-12781DiVA, id: diva2:972974
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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