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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lacerda, P.
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Publications (5/5 displayed)
- 2021Characterization of Iron-Matrix Composites Reinforced by In Situ TiC and Ex Situ WC Fabricated by Castingcitations
- 2021Effect of Heat Treatment on the As-Cast Microstructure and Hardness of NiSi3B2 Alloy
- 2019On the Precipitation of Sigma and Chi Phases in a Cast Super Duplex Stainless Steelcitations
- 2016Near-infrared spatially resolved spectroscopy of (136108) Haumea's multiple systemcitations
- 2001Rapid genotyping of the major alleles at the Duffy (FY) blood group locus using real-time fluorescence polymerase chain reaction.
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article
On the Precipitation of Sigma and Chi Phases in a Cast Super Duplex Stainless Steel
Abstract
Super duplex stainless steels are prone to the formation of undesirable secondary phases, particularly when exposed to slow cooling rates. In the current study, the mechanisms of formation of secondary phases have been characterized using a combination of optical microscopy, scanning electron microscopy, and transmission electron microscopy, on samples aged at temperatures ranging between 700 degrees C and 1000 degrees C. Among the possible secondary phases, chi-phase and sigma-phase were detected and identified as the main phases responsible for the destabilization of the duplex microstructure. The kinetics of both phases were assessed. In particular, the chi-phase forms prior to sigma-phase, until it starts to convert into sigma-phase. Finally, the TTT curves for the stable sigma-phase were calculated. We found that the precipitation of the sigma-phase starts as early as 30 seconds at 950 degrees C.