Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel
Supermartensitic 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 an...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2018-03-01
|
| Series: | Materials Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300011&tlng=en |
| _version_ | 1819258952919023616 |
|---|---|
| author | Frederico Augusto Pires Fernandes Carlos Alberto Picone George Edward Totten Luiz Carlos Casteletti |
| author_facet | Frederico Augusto Pires Fernandes Carlos Alberto Picone George Edward Totten Luiz Carlos Casteletti |
| author_sort | Frederico Augusto Pires Fernandes |
| collection | DOAJ |
| description | Supermartensitic 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°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°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°C was the only condition in which significant improvement of corrosion is observed. For plasma nitriding and nitrocarburising at 450 and 500°C, some pitting was detected. |
| first_indexed | 2024-12-23T19:02:18Z |
| format | Article |
| id | doaj.art-04fea8b3d19d471bb3acc72394cbfcc2 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-23T19:02:18Z |
| publishDate | 2018-03-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-04fea8b3d19d471bb3acc72394cbfcc22022-12-21T17:34:41ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392018-03-0121310.1590/1980-5373-mr-2016-0793Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless SteelFrederico Augusto Pires Fernandeshttps://orcid.org/0000-0003-0800-9264Carlos Alberto PiconeGeorge Edward TottenLuiz Carlos CastelettiSupermartensitic 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°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°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°C was the only condition in which significant improvement of corrosion is observed. For plasma nitriding and nitrocarburising at 450 and 500°C, some pitting was detected.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300011&tlng=enSupermartensitic stainless steelsPlasma nitridingPlasma nitrocarburisingCorrosion |
| spellingShingle | Frederico Augusto Pires Fernandes Carlos Alberto Picone George Edward Totten Luiz Carlos Casteletti Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel Materials Research Supermartensitic stainless steels Plasma nitriding Plasma nitrocarburising Corrosion |
| title | Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel |
| title_full | Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel |
| title_fullStr | Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel |
| title_full_unstemmed | Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel |
| title_short | Corrosion Behavior of Plasma Nitrided and Nitrocarburised Supermartensitic Stainless Steel |
| title_sort | corrosion behavior of plasma nitrided and nitrocarburised supermartensitic stainless steel |
| topic | Supermartensitic stainless steels Plasma nitriding Plasma nitrocarburising Corrosion |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000300011&tlng=en |
| work_keys_str_mv | AT fredericoaugustopiresfernandes corrosionbehaviorofplasmanitridedandnitrocarburisedsupermartensiticstainlesssteel AT carlosalbertopicone corrosionbehaviorofplasmanitridedandnitrocarburisedsupermartensiticstainlesssteel AT georgeedwardtotten corrosionbehaviorofplasmanitridedandnitrocarburisedsupermartensiticstainlesssteel AT luizcarloscasteletti corrosionbehaviorofplasmanitridedandnitrocarburisedsupermartensiticstainlesssteel |