Use of composition profiles near sigma phase for assessment of localized corrosion resistance in a duplex stainless steel
N/D
Tipo de produção
Artigo
Data de publicação
2019
Texto completo (DOI)
Periódico
Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
Editor
Texto completo na Scopus
Citações na Scopus
16
Autores
Magnabosco R.
da Costa Morais L.
dos Santos D.C.
Orientadores
Resumo
© 2018 Elsevier LtdPitting corrosion potential of a UNS S31803 duplex stainless steel (DSS) heat treated between 750 °C and 850 °C at different aging times was related to the extent of the Cr- and Mo-depleted areas at sigma-ferrite and sigma-austenite interfaces, estimated using DICTRA® simulations. It is possible to describe the sigma formation kinetics using a model that assumes a spherical region of austenite, with radius equivalent to the mean intercept of austenite islands, surrounded by ferrite. Composition profiles at sigma-ferrite and sigma-austenite interfaces were calculated, allowing the evaluation of the degree of depletion in Cr and Mo at sigma interfaces. There is a reduction of pitting potential with increase of the degree of depletion, characterized as the weighted sum of depleted areas in Cr and Mo composition profiles, making possible the assessment of the localized corrosion resistance of aged DSS through simulation of sigma phase formation.
Citação
MAGNABOSCO, RODRIGO; DA COSTA MORAIS, LUARA; DOS SANTOS, DANIELLA CALUSCIO. Use of composition profiles near sigma phase for assessment of localized corrosion resistance in a duplex stainless steel. CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, v. 64, p. 126-130, 2019.
Palavras-chave
Keywords
DICTRA; Localized corrosion; Pitting; Sigma phase; Stainless steel
Assuntos Scopus
Composition profile; Corrosion potentials; DICTRA; Duplex stainless steel; Formation kinetics; Pitting potential; Sigma phase; Sigma phase formation