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A new approach for DL-EPR testing of thermo-mechanically processed austenitic stainless steel

Rahimi, Salaheddin and Engelberg, Dirk and Marrow, James (2011) A new approach for DL-EPR testing of thermo-mechanically processed austenitic stainless steel. Corrosion Science, 53 (12). 4213–4222. ISSN 0010-938X

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Abstract

Standard test methods such as the electrochemical potentiokinetic reactivation test (EPR) and double- loop EPR test (DL-EPR) are commonly used to characterise sensitisation behaviour in austenitic stainless steels and nickel-based alloys. In this study, the DL-EPR test is augmented by large-area image analysis (IA) to characterise and quantify the networks of attacked grain boundaries. A new analysis approach that is based on a grain boundary cluster parameter is proposed to describe the network of corrosion suscep- tible grain boundaries, which may be estimated from electron backscatter diffraction (EBSD) data. This method may provide a better assessment of the relative DOS of different heats of austenitic stainless steels.