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Development of sintered Mn-(Mo)-(Cr)-C steels.

Mitchell S.C., Wronski A.S., Cias A.

Inżynieria Materiałowa

2001

R. XXII, nr 5

633-646

The potential of manganese and chromium as alloying elements, reflected in their widespread use in wrought medium-to-high strength steels, is still to be realised in Powder Metallurgy alloys. The attempts to sinter Mn [+ Cr] alloys have largely ended in failure, due to either poor mechanical properties or lack of reproducibility. The authors have analysed previously published results and identified the principal reason as lack of process control: both in powder preparation and during sintering. This leads to large-scale oxidation, in the form of brittle networks, and also to lack of diffusion, due to the oxide film barriers. Reviewed now are the necessary processing conditions established for the successful processing of manganese steels. The development of additional chromium and molybdenum alloying is also considered and results are presented which additionally incorporate current areas of research, involving warm compaction, high temperature (including liquid phase) sintering and sinter and air hardening.

Dimensional changes during sintering of manganese-carbon steel compacts.

Pieczonka T., Mitchell S.C., Ciaś A., Sułowski M., Wronski A.S.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1171-1174

Sintering behaviour in high purity hydrogen of Hoganas NC 100.24 iron powder with carbon and two different types of ferromanganese additions was investigated. The influence of different manganese contents (3.0 and 4.0 wt.-%), type of ferromanganese used (low and high carbon) and isothermal sintering temperature (1120, 1240 and 1300 degrees centigrade) on dimensional changes was investigated by dilatometry. It is shown that the dimensional changes occuring during heating and isothermal sintering and the final density of sintered compacts are influenced by manganese and carbon through their interactions with base iron. The results assist in the choice of industrial sintering conditions when the requirement is very small dimensional changes of compacts for a range of manganese and carbon contents.