Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

This study aims at assessing the degree of susceptibility to intergranular corrosion of the UNS S31803 duplex stainless steel and the 0.4% Mo austenitic stainless steel through the double-loop electrochemical potentiodynamic reactivation (DL-EPR) test. Both steels were subjected to isothermal treatm...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2021-01, Vol.24 (1)
Main Authors: Lacerda, José C. de, Freitas, Lucas L. de, Brito, Rogério F., Moura Filho, Francisco, Teixeira, Ricardo L.P.
Format: Article
Language:English
Subjects:
degree of sensitization
DL-EPR
ENGINEERING, CHEMICAL
intergranular corrosion
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
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Summary:This study aims at assessing the degree of susceptibility to intergranular corrosion of the UNS S31803 duplex stainless steel and the 0.4% Mo austenitic stainless steel through the double-loop electrochemical potentiodynamic reactivation (DL-EPR) test. Both steels were subjected to isothermal treatments at 650ºC and 900ºC in order to compare the effect of temperature on the respective degrees of sensitization. It was observed that the 0.4% Mo austenitic stainless steel presented a higher degree of sensitization and, consequently, a greater susceptibility to the intergranular corrosion process when compared to the UNS S31803 duplex stainless steel in the two temperatures studied. It was also observed that, for both steels, the heat treatment at 900ºC resulted in a higher degree of sensitization when compared to the heat treatment at 650ºC.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2020-0408