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Christian Gierl-Mayer ; Herbert Danninger ; Raquel de Oro Calderon (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Advances in Powder Metallurgy & Particulate Materials-2014 Vol. 5 (2014), p. 74-85.
[Konferensbidrag, refereegranskat]

One of the aspects of modern material systems for high strength sintered steel parts is the presence of alloy elements with widely different oxygen affinity. Compared to the base iron, the “new” alloy elements Cr, Mn and Si form oxides with much higher stability. It is shown here that in case of powder mixes this leads to oxygen transfer from the base iron particles to the alloy elements during heating up to sintering temperature, i.e. metallothermic reduction of the iron surfaces. With prealloyed powders, the surface oxides, which are originally mostly iron oxide, are transformed into alloy element oxides during heating unless the iron oxides can be reduced at low temperature with H2. In any case, the heterogeneity of the oxygen affinity is a parameter that has to be considered when defining alloy systems for sintered steels.

Nyckelord: Prealloyed PM steels, metallothermic reduction, oxide reduction, internal gettering

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Denna post skapades 2014-11-12.
CPL Pubid: 205607