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Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels / S. S. M. Tavares in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 522–526 Titre : Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels Type de document : texte imprimé Auteurs : S. S. M. Tavares, Auteur ; A. Loureiro, Auteur ; J. M. Pardal, Auteur Année de publication : 2012 Article en page(s) : pp. 522–526 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Low  temperature  aging;  pitting  corrosion;  superduplex  stainless  steel Résumé : Some precipitation reactions of superduplex stainless steels (SDSS) can improve hardness, yield, and ultimate strength, but with substantial decrease of corrosion resistance. One of these reactions is the spinodal decomposition of ferrite into Cr-rich fine precipitates (α′) and Cr-depleted matrix during low temperature aging. In this work, the effect of the α′ precipitation on the pitting corrosion resistance was investigated. The results showed that short duration heat treatments at 475 °C do not decrease the pitting corrosion resistance, but increase the hardness of UNS S32750 and S32760 SDSS. The limits of heat treatment duration for both steels were determined. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006016/abstract [article] Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels [texte imprimé] / S. S. M. Tavares, Auteur ; A. Loureiro, Auteur ; J. M. Pardal, Auteur . - 2012 . - pp. 522–526. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 522–526 Mots-clés : Low  temperature  aging;  pitting  corrosion;  superduplex  stainless  steel Résumé : Some precipitation reactions of superduplex stainless steels (SDSS) can improve hardness, yield, and ultimate strength, but with substantial decrease of corrosion resistance. One of these reactions is the spinodal decomposition of ferrite into Cr-rich fine precipitates (α′) and Cr-depleted matrix during low temperature aging. In this work, the effect of the α′ precipitation on the pitting corrosion resistance was investigated. The results showed that short duration heat treatments at 475 °C do not decrease the pitting corrosion resistance, but increase the hardness of UNS S32750 and S32760 SDSS. The limits of heat treatment duration for both steels were determined. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006016/abstract

Influence of microstructure on the corrosion resistance of hyperduplex stainless steel / S. S. M. Tavares in Materials and corrosion, Vol. 61 N° 4 (Avril 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 313–317 Titre : Influence of microstructure on the corrosion resistance of hyperduplex stainless steel Type de document : texte imprimé Auteurs : S. S. M. Tavares, Auteur ; J. M. Pardal, Auteur ; E. Ponzio, Auteur Année de publication : 2010 Article en page(s) : pp. 313–317 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Critical  pitting  temperature;  hyperduplex  stainless  steel;  pitting  corrosion Résumé : Hyperduplex UNS S32707 is a newly developed austenitic–ferritic stainless steel. The steel contains about 27%Cr, 7%Ni, 4.5%Mo, and 0.4%N, which results in a pitting resistance equivalent factor (PRE) equal to 49. In this study, the pitting corrosion resistance of this new grade of stainless steel was investigated by varying the microstructure using different thermal processes. The critical pitting temperature measurement and cyclic polarization tests confirm the high corrosion resistance of the hyperduplex steel in the solution treated condition. However, deleterious phases form easily during thermal processing and cause a drastic decrease in the corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905386/abstract [article] Influence of microstructure on the corrosion resistance of hyperduplex stainless steel [texte imprimé] / S. S. M. Tavares, Auteur ; J. M. Pardal, Auteur ; E. Ponzio, Auteur . - 2010 . - pp. 313–317. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 313–317 Mots-clés : Critical  pitting  temperature;  hyperduplex  stainless  steel;  pitting  corrosion Résumé : Hyperduplex UNS S32707 is a newly developed austenitic–ferritic stainless steel. The steel contains about 27%Cr, 7%Ni, 4.5%Mo, and 0.4%N, which results in a pitting resistance equivalent factor (PRE) equal to 49. In this study, the pitting corrosion resistance of this new grade of stainless steel was investigated by varying the microstructure using different thermal processes. The critical pitting temperature measurement and cyclic polarization tests confirm the high corrosion resistance of the hyperduplex steel in the solution treated condition. However, deleterious phases form easily during thermal processing and cause a drastic decrease in the corrosion resistance. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905386/abstract