Effect of Sigma Phase Precipitated at 850 °C on Corrosion Behaviour of UNS S82441 Duplex Stainless Steel

Duplex stainless steels (DSS) are alloys with binary microstructure consisting of ferrite (δ) and austenite (γ),combining high mechanical properties and corrosion resistance by pitting and stress corrosion, due to the twophases austenite/ferrite. However, the formation of secondary and intermetallic phases, during solidificationprocesses, heat treatment or welding in duplex steels tend to cause the degradation of its main properties. Thepresent study aim to investigate the corrosion behaviour of UNS S82441 aged at 850°C for 30, 300 and 3000minutes, due to the formation of sigma phase. Corrosion resistance evaluation was performed by means ofstress corrosion testing, potenciodinamic polarization and mass loss. The microstructural characterization andmorphology confirmed the presence of sigma phase in the UNS S82441 duplex stainless steel, and that theamount of this phase increases with the time of heat treatment of aging. The aging time influences negativelythe corrosion resistance of this steel, with a gradual drop of up to 50% on passivation regime for the conditionof aging at 850°C for 3000 minutes.Keywords: Duplex Stainless Steel. Corrosion. Sigma Phase. Heat Treatment of Aging