The effect of phase transformation route on the intergranular corrosion susceptibility of 2205 duplex stainless steel

Nima Haghdadi, Majid Laleh, Ali Kosari, M. H. Moayed, Pavel Cizek, Peter D. Hodgson, Hossein Beladi

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Two types of austenite morphologies, equiaxed and Widmanstätten, were produced through different phase transformation routes to evaluate the critical factors affecting the intergranular corrosion susceptibility in a 2205 duplex stainless steel. These distinct austenite morphologies behaved quite differently in secondary phase precipitation on exposure to sensitization temperature. Although the Widmanstätten microstructure was found to have a larger degree of coherent ferrite/austenite interface area compared with the equiaxed one, it showed a higher degree of sensitization. It was clarified that, in addition to the ferrite/austenite interface coherency, the extent of an interface area and presence of un-stable ferrite also play prominent roles in intergranular corrosion susceptibility.

Original languageEnglish
Pages (from-to)26-30
JournalMaterials Letters
Volume238
DOIs
Publication statusPublished - 2019

Keywords

  • Duplex stainless steel
  • Intergranular corrosion
  • Precipitation
  • Sensitization

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