New insights into the hardening and pitting corrosion mechanisms of thermally aged duplex stainless steel at 475 °C: A comparative study between 2205 and 2101 steels

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.

Automated summary

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.