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Effectiveness of reducing agents during sintering of Cr-prealloyed PM steels

Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Powder Metallurgy (0032-5899). Vol. 57 (2014), 4, p. 245-250.
[Artikel, refereegranskad vetenskaplig]

Development of strong inter-particle necks requires successful removal of surface oxides, present on the powder particles, during the initial stages of sintering. In the case of water-atomised powder prealloyed with chromium, the surface oxide consists mainly of an iron oxide layer with some more stable fine particulate oxides. The formation of sufficiently strong inter-particle necks requires as a minimum full removal of the iron surface oxide layer. This can be achieved by gaseous reducing agents (e.g. H2, CO or a mixture of both) or by carbon, typically admixed in the form of graphite. The reducing power of various sintering atmospheres (active gas content #10 vol.-%) and their combined effect with graphite has been investigated by a thermal analysis technique. Results indicate that a combination of a dry hydrogen containing atmosphere and fine graphite allows successful sintering of chromium alloyed PM steels.

Nyckelord: Cr-alloyed PM steel, sintering atmosphere, carbothermal reduction, oxide reduction

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Denna post skapades 2014-11-12. Senast ändrad 2014-12-19.
CPL Pubid: 205600


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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)


Hållbar utveckling
Metallurgi och metalliska material
Övrig teknisk materialvetenskap

Chalmers infrastruktur