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The present study addresses the corrosion fatigue behavior of a Duplex Stainless Steel (DSS) material used for suction rolls at the wet end of paper machines during pulp and paper manufacturing process. Environments that reflect increments of chloride ion concentration, as an effect of water closure (volume of water used per ton of paper produced), were studied as well as different microstructures that might be obtained during manufacturing or repair of the DSS roll materials. Standard corrosion fatigue tests were conducted using compact tension specimens by measuring the crack growth with the number of fatigue cycles and calculating the stress intensity change (driving force) for crack growth under realistic environments. Results from this study clearly indicate that for the tested duplex stainless steel, microstructural changes due to heat treatment had more effect on the threshold stress intensity for crack propagation as well as on crack growth rates compared to the increase in chloride ion concentration in paper mill environments. Increase in chloride ion concentration had a small effect on lowering of threshold stress intensity change, AKlh, or all heat treatments; however, one of the reasons for the insignificant effect of the environment on corrosion fatigue behavior of DSS's might be in the test parameters. The experiments presented in this study were conducted at 25 Hz in a tension/tension sinusoidal waveform to a R=0.5 ( R = ·*·/ ). Under high / ® max frequency the crack tip may not be exposed to the aggressive environment for significant time to be affected in terms of propagation and growth rates. * Corresponding author: Institute of Paper Science and Technology, 500 Tenth St. NW, Atlanta, GA 30318-5794, email: jorge.perdomo@ipst.edu

Corrosion Fatigue of a Heat Treated Duplex Stainless Steel in Paper Machine White Waters