Utilização do equipamento de ensaio EPR-DL de campo na detecção de fase sigma

• Autor(a) principal: Barreto, Abraão Danilo Gomes
• Data de Publicação: 2014
• Outros Autores: Andrade, Tathiane Caminha, Silva, Cleiton Carvalho, Miranda, Hélio Cordeiro de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/59002
• topic: Aço inoxidável superduplex; Ensaio EPR-DL; Fase sigma

This work has objective to correlate the intergranular corrosion susceptibility test named EPR-DL (Electrochemical Potentiokinetic Reactivation of Double Loop) with the sigma phase formation and other phases. It has been used samples from a UNS S32760 steel pipe for conducting various aging heat treatments. Held isothermal heat treatment at 850°C for 1 min, 10 min, 30 min, 1 h, 1h30min and 10 h. Each heat treated sample and as received were tested using the electrochemical polarization reactivation of double loop technique (EPR-DL). It was possible the detection of deleterious phases with DL-EPR portable cell. The EPR-DL test of some samples showed a second peak of reactivation in which the results showed that this peak might be associated with ferrite or be related to the presence of chi phase.