Authors:
Christian-Gierl-Mayer (1), Herbert Danninger (1)
1- TU Wien, Austria
Abstract:
Additives in PM steels are widely used to improve machinability in turning or other machining operations. Commonly, MnS is added because it is cheap and does not have an excessive influence on the mechanical properties. However, MnS tends to form agglomerates and increases the susceptibility to corrosion in the sintered products. Potential alternatives could be sulfides of chromium or tungsten. In the present study these were compared with MnS at two different sintering temperatures. In addition to the thermal stability, both the machinability in turning and the mechanical properties were investigated. It turned out that at least Cr2S3 is a potential candidate as a cutting aid when sintering is done at belt furnace temperatures. Although WS2 seems to be effective, detailed analysis shows that this effectiveness is in fact due to the presence of MnS, which is formed during sintering by an internal getter effect.
DOI:
https://doi.org/10.59499/EP246281579
