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Higher densities of PM-steels by warm secondary compaction and sizing

: Recknagel, C.; Marquardt, A.; Langer, I.; Müller, S.; Kieback, B.

European Powder Metallurgy Association -EPMA-:
Euro PM 2011 Proceedings. Vol 3: Powder pressing, secondary & finishing, full density, sintering, tools for improving PM, PM applications : Powder Metallurgy Congress & Exhibition; 9th - 12th October 2011, CCIB Congress Centre, Barcelona, Spain
Shrewsbury: EPMA, 2011
ISBN: 978-1-89907-222-4
European Congress and Exhibition on Powder Metallurgy (EURO PM) <2011, Barcelona>
Powder Metallurgy World Congress & Exhibition (PM) <2011, Barcelona>
Conference Paper
Fraunhofer IFAM ()

Reaching higher densities is one of the biggest challenges for PM products today. This paper presents how new compaction processes like secondary pressing and sizing at elevated temperatures increase density and mechanical properties of sintered steels.
A prealloyed iron powder Astaloy CrL with 1.5 % Cr and 0.2 % Mo (Höganäs AB) was used without and with an amount of 0.5 % graphite. The powders were compacted by different methods that combine double press/double sinter, warm compaction for both pressing stages and warm sizing. The compaction and sizing temperatures were ranged from 20 °C to 200 °C. The various processing routes are compared through measurements of density, microstructure and mechanical properties. The results show that elevated temperatures in different compaction stages lead to a significant increase of the relevant properties.