Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel

Laboratory double-deformation isothermal tests and multipass continuous cooling hot torsion tests were used to study the static recrystallization of austenite under isothermal and anisothermal conditions as well as to simulate the hot rolling of a 0.13% V-microalloyed steel. Characterization of the...

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Detalhes bibliográficos
Autores: Gómez, Manuel, Rancel, Lucía, Fernández, B. J., Medina, Sebastián F.
Formato: artículo
Fecha de publicación:2009
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/56415
Acesso em linha:http://hdl.handle.net/10261/56415
Access Level:acceso abierto
Palavra-chave:Microalloyed steels
Hot rolling
Static recrystallization
Austenite grain size
Anisothermal Softening
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spelling Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steelGómez, ManuelRancel, LucíaFernández, B. J.Medina, Sebastián F.Microalloyed steelsHot rollingStatic recrystallizationAustenite grain sizeAnisothermal SofteningLaboratory double-deformation isothermal tests and multipass continuous cooling hot torsion tests were used to study the static recrystallization of austenite under isothermal and anisothermal conditions as well as to simulate the hot rolling of a 0.13% V-microalloyed steel. Characterization of the evolution of austenite microstructure was carried out. It has been verified that no-recrystallization temperature (Tnr) approximately corresponds to the temperature where recrystallization starts to be incomplete during rolling. However, incomplete recrystallization is visually evident at temperatures 25–50 °C below Tnr, where grain elongation and increase in aspect ratio with temperature drop start to be significant. An accurate method to estimate the recrystallized fraction during hot rolling from stress–strain data and with no need of metallographic studies has been designed. The results of this method have been compared to metallographic measurements, the values of anisothermal fractional softening and the accumulated stress measured in the MFS plots at T < Tnr. A pronounced austenite grain refinement has been detected in the first hot rolling passes after reheating, as grain size decreases from 155 μm to 27 μm in six passes. If the effect of grain size on recrystallization and precipitation is taken into account, the correlation of isothermal and continuous cooling tests as well as the relationship between SRCT and Tnr or RLT temperatures can be better understood.Peer reviewedElsevier201220122009info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/56415reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.msea.2008.09.074info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/564152026-05-22T06:33:51Z
dc.title.none.fl_str_mv Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
title Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
spellingShingle Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
Gómez, Manuel
Microalloyed steels
Hot rolling
Static recrystallization
Austenite grain size
Anisothermal Softening
title_short Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
title_full Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
title_fullStr Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
title_full_unstemmed Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
title_sort Evolution of austenite static recrystallization and grain size during hot rolling of a V-microalloyed steel
dc.creator.none.fl_str_mv Gómez, Manuel
Rancel, Lucía
Fernández, B. J.
Medina, Sebastián F.
author Gómez, Manuel
author_facet Gómez, Manuel
Rancel, Lucía
Fernández, B. J.
Medina, Sebastián F.
author_role author
author2 Rancel, Lucía
Fernández, B. J.
Medina, Sebastián F.
author2_role author
author
author
dc.subject.none.fl_str_mv Microalloyed steels
Hot rolling
Static recrystallization
Austenite grain size
Anisothermal Softening
topic Microalloyed steels
Hot rolling
Static recrystallization
Austenite grain size
Anisothermal Softening
description Laboratory double-deformation isothermal tests and multipass continuous cooling hot torsion tests were used to study the static recrystallization of austenite under isothermal and anisothermal conditions as well as to simulate the hot rolling of a 0.13% V-microalloyed steel. Characterization of the evolution of austenite microstructure was carried out. It has been verified that no-recrystallization temperature (Tnr) approximately corresponds to the temperature where recrystallization starts to be incomplete during rolling. However, incomplete recrystallization is visually evident at temperatures 25–50 °C below Tnr, where grain elongation and increase in aspect ratio with temperature drop start to be significant. An accurate method to estimate the recrystallized fraction during hot rolling from stress–strain data and with no need of metallographic studies has been designed. The results of this method have been compared to metallographic measurements, the values of anisothermal fractional softening and the accumulated stress measured in the MFS plots at T < Tnr. A pronounced austenite grain refinement has been detected in the first hot rolling passes after reheating, as grain size decreases from 155 μm to 27 μm in six passes. If the effect of grain size on recrystallization and precipitation is taken into account, the correlation of isothermal and continuous cooling tests as well as the relationship between SRCT and Tnr or RLT temperatures can be better understood.
publishDate 2009
dc.date.none.fl_str_mv 2009
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/56415
url http://hdl.handle.net/10261/56415
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.msea.2008.09.074
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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