Detecção de fases deletérias no aço inoxidável superduplex UNS S32760 (Zeron 100) utilizando equipamento de ensaio EPR-DL de campo

Abstract

This work has objective to correlate the intergranular corrosion susceptibility test named EPR (Electrochemical Potentiokinetic Reactivation) with the sigma phase formation and other phases. It has been used samples from a steel pipe UNS 32760 for conducting various aging heat treatments. Held isothermal treatment at 850°C for 1 min, 10 min, 30 min, 1 h, 1h 30 min and 10 h. Each treated sample as received were tested using technique of the double loop electrochemical polarization reactivation (DL-EPR). It was possible the deleterious phase detection with field DL-EPR test. The DL-EPR test of some samples showed a second peak of reactivation in which the results showed that this peak may be associated with ferrite or be related to the presence of chi phase.