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The corrosion fatigue behavior of duplex stainless steel (DSS) was studied at different cyclic stress levels in 3.5%NaCl (mass fraction, so as the follows) solution (pH = 7) at 50℃. The results showed that DSS was susceptible to pitting Corrosion and Corrosion fa- tigue. Both Intergranluar Corrosion cracking and transgranlular corrosion cracking initiated at the bottom of pitting holes. Furthermore, the corrosion fatigue properties of DSS in 3.5%NaCl solution may be relatived to complex electrochemical and mechanical coupling effects between the three phases (austenite, ferrite and medensite), where martensite and ferrite were anodic in the corrosion cell and could be prone to cracking under certain condition.
The corrosion pattern of duplex stainless steel (DSS) was studied at different cyclic stress levels in 3.5% NaCl (mass fraction, so as the follows) solution (pH = 7) at 50 ° C. The results showed that DSS was susceptible to pitting Corrosion and Corrosion fa- tigue. Both Intergranluar Corrosion cracking and transgranlular corrosion cracking initiated at the bottom of pitting holes. Further, the corrosion fatigue properties of DSS in 3.5% NaCl solution may be relatived to complex electrochemical and mechanical coupling effects between the three phases (austenite, ferrite and medensite), where martensite and ferrite were anodic in the corrosion cell and could be prone to cracking under certain condition.