Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 98, Issue -, Pages 123-135Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.04.046
Keywords
Duplex stainless steel; Spinodal decomposition; G-phase precipitation; Pitting corrosion; Hardening
Funding
- PPGCEM/UFSCar (Materials Science and Engineering Postgraduate Program at the Federal University of Sao Carlos)
- CNPq (National Council for Scientific and Technological Development, Brazil) [311163/2017-3, 312614/2020-9]
- FAPESP (Sao Paulo Research Foundation, Brazil) [2020/03205-6]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
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The study investigated the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in ferrite on the hardening and pitting corrosion of two thermally aged DSSs at 475 degrees C. It was found that for 2205 DSS, pitting corrosion behavior is influenced by G-phase precipitates, while for 2101 DSS, pitting corrosion resistance is mainly affected by the formation of Cr-richer nitrides.
In this study, the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels (DSSs) at 475 degrees C was investigated. Results indicate that, for 2205 DSS, pitting corrosion behavior is influenced by the presence and size of G-phase precipitates for longer aging times, but this contribution is masked by the advanced stage of spinodal decomposition in the ferritic structure. On the other hand, for 2101 DSS, the formation of Cr-richer nitrides impairs pitting corrosion resistance more than spinodal decomposition. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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