Evaluation of microstructural effects on the degree of sensitization (DOS) of a UNS S31803 duplex stainless steel aged at 475°C

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Artigo
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2015
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De Melo E.B.
Magnabosco R.
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Periódico
Corrosion
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BARBOSA DE MELO, EVELIN; Magnabosco, Rodrigo. EVALUATION OF MICROSTRUCTURAL EFFECTS ON THE DEGREE OF SENSITIZATION (DOS) OF A UNS S31803 DUPLEX STAINLESS STEEL AGED AT 475ºC. CORROSION, v. 71, n. 12, p. 1490-1499, 2015.
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© 2015, NACE International.In this study, microstructural and electrochemical behavior of a UNS S31803 duplex stainless steel aged at 475°C were investigated. Hardness values increased with aging at 475°C and evidence of alpha prime (α′) phase formation was confirmed by transmission electron microscopy analysis. Double loop electrochemical potentiokinetic reactivation measurements in a 2 M H2SO4 + 0.5 M NaCl + 0.01 M KSCN solution showed an increase in the degree of sensitization values, mainly for the sample aged for 360 h at 475°C. Moreover, the results suggest that α′ phase formation occurred via spinodal decomposition mechanism.

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