Microstructure and mechanical properties of a microalloyed steel after thermal treatments.

Detalhes bibliográficos
Autor(a) principal: Cota, André Barros
Data de Publicação: 2003
Outros Autores: Oliveira, Fernando Lucas Gonçalves e, Barbosa, Anderson Luiz da Rocha e, Lacerda, Cássio Antônio Mendes, Araújo, Fernando Gabriel da Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/2027
Resumo: The properties of a microalloyed steel, with Nb and V in its composition, were studied, after different intercritical thermal treatments and at different austenitizing and tempering temperatures. The mechanical properties of the specimens were measured in a Vickers hardness tester, and their microstructures were analyzed by optical microscopy, with the aid of a digital image processor. After austenitizing at 1100 °C and tempering at 625 °C, the samples showed significantly higher tempering resistance, reflected by their retention of high hardness, which may be associated with a secondary hardening precipitation of Nb carbon nitrides. In the sample with dualphase microstructure, the martensite volume fraction varied from 18.2 to 26.3% and the ferrite grain size remained unchanged, upon the variation of the time length of the intercritical treatments. Tempered samples showed Vickers hardness (HVN) varying from 327 to 399, and dualphase samples showed HVN from 362 to 429.
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spelling Cota, André BarrosOliveira, Fernando Lucas Gonçalves eBarbosa, Anderson Luiz da Rocha eLacerda, Cássio Antônio MendesAraújo, Fernando Gabriel da Silva2012-12-14T16:51:47Z2012-12-14T16:51:47Z2003COTA, A. B. et al. Microstructure and mechanical properties of a microalloyed steel after thermal treatments. Materials Research, v. 6, n. 2, p. 117-121, 2003. Disponível em: <http://www.scielo.br/pdf/mr/v6n2/16011.pdf>. Acesso em: 13 dez. 2012.15161439http://www.repositorio.ufop.br/handle/123456789/2027The properties of a microalloyed steel, with Nb and V in its composition, were studied, after different intercritical thermal treatments and at different austenitizing and tempering temperatures. The mechanical properties of the specimens were measured in a Vickers hardness tester, and their microstructures were analyzed by optical microscopy, with the aid of a digital image processor. After austenitizing at 1100 °C and tempering at 625 °C, the samples showed significantly higher tempering resistance, reflected by their retention of high hardness, which may be associated with a secondary hardening precipitation of Nb carbon nitrides. In the sample with dualphase microstructure, the martensite volume fraction varied from 18.2 to 26.3% and the ferrite grain size remained unchanged, upon the variation of the time length of the intercritical treatments. Tempered samples showed Vickers hardness (HVN) varying from 327 to 399, and dualphase samples showed HVN from 362 to 429.Thermal treatmentDual-phase steelTempered martensiteMicrostructure and mechanical properties of a microalloyed steel after thermal treatments.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleAutorização concedida ao Repositório Institucional da UFOP pelo Periódico Materials Research em 25/10/2013 para depositar uma cópia eletrônica dos artigos publicados por esse periódico em que ao menos um dos autores é aluno ou professor da UFOP.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://www.repositorio.ufop.br/bitstream/123456789/2027/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52ORIGINALARTIGO_MicrostrutureMechanicalProperties.pdfARTIGO_MicrostrutureMechanicalProperties.pdfapplication/pdf899091http://www.repositorio.ufop.br/bitstream/123456789/2027/1/ARTIGO_MicrostrutureMechanicalProperties.pdfb572d104d4924276ab14b8562fdcb480MD51123456789/20272016-11-07 09:17:58.581oai:localhost: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Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332016-11-07T14:17:58Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.pt_BR.fl_str_mv Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
title Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
spellingShingle Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
Cota, André Barros
Thermal treatment
Dual-phase steel
Tempered martensite
title_short Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
title_full Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
title_fullStr Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
title_full_unstemmed Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
title_sort Microstructure and mechanical properties of a microalloyed steel after thermal treatments.
author Cota, André Barros
author_facet Cota, André Barros
Oliveira, Fernando Lucas Gonçalves e
Barbosa, Anderson Luiz da Rocha e
Lacerda, Cássio Antônio Mendes
Araújo, Fernando Gabriel da Silva
author_role author
author2 Oliveira, Fernando Lucas Gonçalves e
Barbosa, Anderson Luiz da Rocha e
Lacerda, Cássio Antônio Mendes
Araújo, Fernando Gabriel da Silva
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Cota, André Barros
Oliveira, Fernando Lucas Gonçalves e
Barbosa, Anderson Luiz da Rocha e
Lacerda, Cássio Antônio Mendes
Araújo, Fernando Gabriel da Silva
dc.subject.por.fl_str_mv Thermal treatment
Dual-phase steel
Tempered martensite
topic Thermal treatment
Dual-phase steel
Tempered martensite
description The properties of a microalloyed steel, with Nb and V in its composition, were studied, after different intercritical thermal treatments and at different austenitizing and tempering temperatures. The mechanical properties of the specimens were measured in a Vickers hardness tester, and their microstructures were analyzed by optical microscopy, with the aid of a digital image processor. After austenitizing at 1100 °C and tempering at 625 °C, the samples showed significantly higher tempering resistance, reflected by their retention of high hardness, which may be associated with a secondary hardening precipitation of Nb carbon nitrides. In the sample with dualphase microstructure, the martensite volume fraction varied from 18.2 to 26.3% and the ferrite grain size remained unchanged, upon the variation of the time length of the intercritical treatments. Tempered samples showed Vickers hardness (HVN) varying from 327 to 399, and dualphase samples showed HVN from 362 to 429.
publishDate 2003
dc.date.issued.fl_str_mv 2003
dc.date.accessioned.fl_str_mv 2012-12-14T16:51:47Z
dc.date.available.fl_str_mv 2012-12-14T16:51:47Z
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.citation.fl_str_mv COTA, A. B. et al. Microstructure and mechanical properties of a microalloyed steel after thermal treatments. Materials Research, v. 6, n. 2, p. 117-121, 2003. Disponível em: <http://www.scielo.br/pdf/mr/v6n2/16011.pdf>. Acesso em: 13 dez. 2012.
dc.identifier.uri.fl_str_mv http://www.repositorio.ufop.br/handle/123456789/2027
dc.identifier.issn.none.fl_str_mv 15161439
identifier_str_mv COTA, A. B. et al. Microstructure and mechanical properties of a microalloyed steel after thermal treatments. Materials Research, v. 6, n. 2, p. 117-121, 2003. Disponível em: <http://www.scielo.br/pdf/mr/v6n2/16011.pdf>. Acesso em: 13 dez. 2012.
15161439
url http://www.repositorio.ufop.br/handle/123456789/2027
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
bitstream.url.fl_str_mv http://www.repositorio.ufop.br/bitstream/123456789/2027/2/license.txt
http://www.repositorio.ufop.br/bitstream/123456789/2027/1/ARTIGO_MicrostrutureMechanicalProperties.pdf
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