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: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000200002
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 dual-phase 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 dual-phase samples showed HVN from 362 to 429.
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spelling Microstructure and mechanical properties of a microalloyed steel after thermal treatmentsthermal treatmentdual-phase steeltempered martensiteThe 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 dual-phase 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 dual-phase samples showed HVN from 362 to 429.ABM, ABC, ABPol2003-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000200002Materials Research v.6 n.2 2003reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392003000200002info:eu-repo/semantics/openAccessCota,André BarrosOliveira,Fernando Lucas Gonçalves eBarbosa,Anderson Luiz da Rocha eLacerda,Cássio Antônio MendesAraújo,Fernando Gabriel da Silvaeng2003-07-03T00:00:00Zoai:scielo:S1516-14392003000200002Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2003-07-03T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.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 dual-phase 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 dual-phase samples showed HVN from 362 to 429.
publishDate 2003
dc.date.none.fl_str_mv 2003-06-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000200002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000200002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392003000200002
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.6 n.2 2003
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
_version_ 1754212657305485312

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