dc.contributorUniversidade Federal do ABC (UFABC)
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorPortland State Univ
dc.contributorUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-29T14:59:47Z
dc.date.available2018-11-29T14:59:47Z
dc.date.created2018-11-29T14:59:47Z
dc.date.issued2018-01-01
dc.identifierMaterials Research-ibero-american Journal Of Materials. Sao Carlos: Univ Fed Sao Carlos, Dept Engenharia Materials, v. 21, n. 3, 9 p., 2018.
dc.identifier1516-1439
dc.identifierhttp://hdl.handle.net/11449/166135
dc.identifier10.1590/1980-5373-MR-2016-0793
dc.identifierS1516-14392018000300011
dc.identifierWOS:000432387700002
dc.identifierS1516-14392018000300011.pdf
dc.description.abstractSupermartensitic stainles steels (SMSS's) are a new generation of martensitic steels that have been increasingly used in oil and gas applications due to their adequate corrosion resistance and mechanical properties. In the present study, SMSS specimens (UNS S41425) were solution heat treated and air cooled followed by plasma nitriding and nitrocarburising at 400, 450 and 500 degrees C for 5h. The produced layers were characterized by optical microscopy, microhardness testing, X-ray diffraction and corrosion testing in NaCl 3.5% solution. Surface alloying with nitrogen or both nitrogen and carbon results in increased surface hardness and homogeneous layers in which layer thickness increases with temperature. However, plasma nitriding yields a slightly thicker case than nitrocarburising. X-ray diffraction indicates very broad and overlapped peaks for the treatments conducted at 400 degrees C. Increasing treatment temperature appears to result in the formation of chromium nitrides and iron nitrides and carbides, depending on the treatment. It was also found that treatment temperature drastically affects the corrosion response of the steel. The untreated steel presented a pitting potential close to 250mV. Plasma nitriding at 400 degrees C was the only condition in which significant improvement of corrosion is observed. For plasma nitriding and nitrocarburising at 450 and 500 degrees C, some pitting was detected.
dc.languageeng
dc.publisherUniv Fed Sao Carlos, Dept Engenharia Materials
dc.relationMaterials Research-ibero-american Journal Of Materials
dc.relation0,398
dc.rightsAcesso aberto
dc.sourceWeb of Science
dc.subjectSupermartensitic stainless steels
dc.subjectPlasma nitriding
dc.subjectPlasma nitrocarburising
dc.subjectCorrosion
dc.titleCorrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel
dc.typeArtículos de revistas


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