| Issue |
Rev. Met. Paris
Volume 99, Number 12, December 2002
Présent et futur des matériaux frittés
|
|
|---|---|---|
| Page(s) | 1027 - 1032 | |
| DOI | https://doi.org/10.1051/metal:2002150 | |
| Published online | 22 January 2003 | |
Sintering of prealloyed duplex stainless steel powders at atmospheric pressure
In this paper an extension of the sintering method at atmospheric pressure, already used for tool steels, is proposed for prealloyed duplex stainless steel powders. A wide temperature range is tested and the effectiveness of boron as activator of the process is investigated. In all the samples no evidence of liquid phase is observed ; the sintering process allows full density in case of no boron addition and it occurs by solid phase diffusion, enhanced by the presence of two phases, austenite and ferrite : this makes needless to add boron as activator. We obtain density and hardness values comparable with the “as-cast” ones, isotropic phases structure and γ/δ ratio of about 50/50 for the best sintering temperature (1150 °C).
© La Revue de Métallurgie, 2002
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