Materials· 2014Q2· Review
Effect of Secondary Phase Precipitation on the Corrosion Behavior of Duplex Stainless Steels
- 219citations
- Q2SCImago
- 2014year
Short summary
Secondary phase precipitation, specifically sigma/chi phases (700-900°C) and spinodal decomposition (350-550°C), significantly degrades the corrosion resistance of duplex stainless steels.
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Key points
- Duplex stainless steels are susceptible to intergranular, pitting, and stress corrosion.
- Secondary phases like sigma and chi precipitate at 700-900°C.
- Spinodal decomposition occurs at 350-550°C, forming Cr-rich and Cr-poor ferrite.
- These microstructural changes negatively impact DSS corrosion resistance.
AI-generated from the title and abstract; the full text is not read.
Abstract
Duplex stainless steels (DSSs) with austenitic and ferritic phases have been increasingly used for many industrial applications due to their good mechanical properties and corrosion resistance in acidic, caustic and marine environments. However, DSSs are susceptible to intergranular, pitting and stress corrosion in corrosive environments due to the formation of secondary phases. Such phases are induced in DSSs during the fabrication, improper heat treatment, welding process and prolonged exposure to high temperatures during their service lives. These include the precipitation of sigma and chi phases at 700-900 °C and spinodal decomposition of ferritic grains into Cr-rich and Cr-poor phases at 350-550 °C, respectively. This article gives the state-of the-art review on the microstructural evolution of secondary phase formation and their effects on the corrosion behavior of DSSs.
The authors' abstract, as published at the source. Materials, 2014 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science