Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jmrt.2013.01.007 http://hdl.handle.net/11449/228028 |
Resumo: | The expanded austenite γ<inf>N</inf> can be produced in austenitic stainless steels by plasma nitriding, carburizing or nitrocarburizing at low temperatures. This metastable phase presents higher hardness and toughness if compared with traditional nitride layers whilst also maintaining the corrosion resistance. However, the application of plasmas composed by both nitrogen and carbon is technologically recent and the effect of such process on the microstructure and properties of the nitrocarburized layers is still under investigation. In this study, samples of UNS S31254 superaustenitic stainless steel were produced by plasma nitriding and nitrocarburizing at 400 C, 450 C and 500 C for 5 h. The plasma treated samples were observed by optical and transmission electron microscopy and also analyzed by X-ray diffraction. The thickness of the layers increased with temperature and the nitrocarburized layers were thicker than nitrided at a given temperature. The presence of expanded austenite was confirmed by X-ray diffraction through its characteristic anomalous shift on the diffracted peaks related to the austenite. Nitride formation on samples produced at 400 C was only identified by transmission electron microscopy where fine rounded particles with 10-15 nm size revealed reflections consistent with the CrN cubic chromium nitride. The estimated lattice parameter from the expanded austenite ranged from 0.38 to 0.41 nm depending on the employed {h k l} reflection which was found to be 6-11% larger than the untreated austenite lattice parameter. © 2013 Brazilian Metallurgical, Materials and Mining Association. |
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Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steelExpanded austeniteMicrostructureNitridingNitrocarburizingSuperaustenitic stainless steelTransmission electron microscopyThe expanded austenite γ<inf>N</inf> can be produced in austenitic stainless steels by plasma nitriding, carburizing or nitrocarburizing at low temperatures. This metastable phase presents higher hardness and toughness if compared with traditional nitride layers whilst also maintaining the corrosion resistance. However, the application of plasmas composed by both nitrogen and carbon is technologically recent and the effect of such process on the microstructure and properties of the nitrocarburized layers is still under investigation. In this study, samples of UNS S31254 superaustenitic stainless steel were produced by plasma nitriding and nitrocarburizing at 400 C, 450 C and 500 C for 5 h. The plasma treated samples were observed by optical and transmission electron microscopy and also analyzed by X-ray diffraction. The thickness of the layers increased with temperature and the nitrocarburized layers were thicker than nitrided at a given temperature. The presence of expanded austenite was confirmed by X-ray diffraction through its characteristic anomalous shift on the diffracted peaks related to the austenite. Nitride formation on samples produced at 400 C was only identified by transmission electron microscopy where fine rounded particles with 10-15 nm size revealed reflections consistent with the CrN cubic chromium nitride. The estimated lattice parameter from the expanded austenite ranged from 0.38 to 0.41 nm depending on the employed {h k l} reflection which was found to be 6-11% larger than the untreated austenite lattice parameter. © 2013 Brazilian Metallurgical, Materials and Mining Association.Department of Materials Engineering, Escola de Engenharia de São Carlos, Universidade de São Paulo (EESC/USP), São Carlos, SPDepartment of Mechanical Engineering, Universidade Estadual Paulista (UNESP), Ilha Solteira, SPDepartment of Mechanical Engineering, Universidade Estadual Paulista (UNESP), Ilha Solteira, SPUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Fernandes, Frederico Augusto PiresCasteletti, Luiz CarlosGallego, Juno [UNESP]2022-04-29T07:26:23Z2022-04-29T07:26:23Z2013-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article158-164http://dx.doi.org/10.1016/j.jmrt.2013.01.007Journal of Materials Research and Technology, v. 2, n. 2, p. 158-164, 2013.2238-7854http://hdl.handle.net/11449/22802810.1016/j.jmrt.2013.01.0072-s2.0-84938558143Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Materials Research and Technologyinfo:eu-repo/semantics/openAccess2024-07-04T20:06:00Zoai:repositorio.unesp.br:11449/228028Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:29:17.781935Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
title |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
spellingShingle |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel Fernandes, Frederico Augusto Pires Expanded austenite Microstructure Nitriding Nitrocarburizing Superaustenitic stainless steel Transmission electron microscopy |
title_short |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
title_full |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
title_fullStr |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
title_full_unstemmed |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
title_sort |
Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel |
author |
Fernandes, Frederico Augusto Pires |
author_facet |
Fernandes, Frederico Augusto Pires Casteletti, Luiz Carlos Gallego, Juno [UNESP] |
author_role |
author |
author2 |
Casteletti, Luiz Carlos Gallego, Juno [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Fernandes, Frederico Augusto Pires Casteletti, Luiz Carlos Gallego, Juno [UNESP] |
dc.subject.por.fl_str_mv |
Expanded austenite Microstructure Nitriding Nitrocarburizing Superaustenitic stainless steel Transmission electron microscopy |
topic |
Expanded austenite Microstructure Nitriding Nitrocarburizing Superaustenitic stainless steel Transmission electron microscopy |
description |
The expanded austenite γ<inf>N</inf> can be produced in austenitic stainless steels by plasma nitriding, carburizing or nitrocarburizing at low temperatures. This metastable phase presents higher hardness and toughness if compared with traditional nitride layers whilst also maintaining the corrosion resistance. However, the application of plasmas composed by both nitrogen and carbon is technologically recent and the effect of such process on the microstructure and properties of the nitrocarburized layers is still under investigation. In this study, samples of UNS S31254 superaustenitic stainless steel were produced by plasma nitriding and nitrocarburizing at 400 C, 450 C and 500 C for 5 h. The plasma treated samples were observed by optical and transmission electron microscopy and also analyzed by X-ray diffraction. The thickness of the layers increased with temperature and the nitrocarburized layers were thicker than nitrided at a given temperature. The presence of expanded austenite was confirmed by X-ray diffraction through its characteristic anomalous shift on the diffracted peaks related to the austenite. Nitride formation on samples produced at 400 C was only identified by transmission electron microscopy where fine rounded particles with 10-15 nm size revealed reflections consistent with the CrN cubic chromium nitride. The estimated lattice parameter from the expanded austenite ranged from 0.38 to 0.41 nm depending on the employed {h k l} reflection which was found to be 6-11% larger than the untreated austenite lattice parameter. © 2013 Brazilian Metallurgical, Materials and Mining Association. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-01-01 2022-04-29T07:26:23Z 2022-04-29T07:26:23Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jmrt.2013.01.007 Journal of Materials Research and Technology, v. 2, n. 2, p. 158-164, 2013. 2238-7854 http://hdl.handle.net/11449/228028 10.1016/j.jmrt.2013.01.007 2-s2.0-84938558143 |
url |
http://dx.doi.org/10.1016/j.jmrt.2013.01.007 http://hdl.handle.net/11449/228028 |
identifier_str_mv |
Journal of Materials Research and Technology, v. 2, n. 2, p. 158-164, 2013. 2238-7854 10.1016/j.jmrt.2013.01.007 2-s2.0-84938558143 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Materials Research and Technology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
158-164 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128366865285120 |