|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||GG-5: Investigation of Corrosion Fatigue of Duplex Steel X2CrNiMoN22-5-3 Exposed to the Geothermal Environment under Different Electrochemical Conditions
||Marcus Wolf, Roman Afanasiev, Thomas Boellinghaus, Anja Pfennig
|On-Site Speaker (Planned)
The corrosion fatigue (CF) of duplex stainless steel X2CrNiMoN22-5-3 was investigated by means of applying alternating axial cyclic load until the failure of hourglass shaped laboratory specimens. A special corrosion chamber allowed for circulation of an electrolyte with a chemical composition of the Northern German Basin heated to 369 K. The experiments were accomplished for a range of stress amplitudes with and without a distinct electrical insulation of the specimen.
An electrical insulation resulted in a stabilized free corrosion behavior with more noble initial values, a negative shift of the CF life expectancy and an increased degradation rate of the material. Microstructural analysis revealed horizontal local corrosion, multiple fatigue cracks and preferable degradation of the austenitic phase.
Additionally, the influence of a possible protective potential on the CF was investigated by implementing a potentiostat. A significant increase of CF life expectancy was observed for a distinct range of protective potentials.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)