Microstructure evolution during warm deformation of low carbon steel with dispersed cementite
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.4028/www.scientific.net/MSF.558-559.505 http://hdl.handle.net/11449/70101 |
Resumo: | The microstructure evolution and mechanical behavior during large strain of a 0.16%C-Mn steel has been investigated by warm torsion tests. These experiments were carried out at 685°C at equivalent strain rate of 0.1 s . The initial microstructure composed of a martensite matrix with uniformly dispersed fine cementite particles was attained by quenching and tempering. The microstructure evolution during tempering and straining was performed through interrupted tests. As the material was reheated to testing temperature, well-defined cell structure was created and subgrains within lath martensite were observed by TEM; strong recovery took place, decreasing the dislocation density. After 1 hour at the test temperature and without straining, EBSD technique showed the formation of new grains. The flow stress curves measured had a peculiar shape: rapid work hardening to a hump, followed by an extensive flow-softening region. 65% of the boundaries observed in the sample strained to ε = 1.0 were high angle grain boundaries. After straining to ε = 5.0, average ferrite grain size close to 1.5 μm was found, suggesting that dynamic recrystallization took place. Also, two sets of cementite particles were observed: large particles aligned with straining direction and smaller particles more uniformly dispersed. The fragmentation or grain subdivision that occurred during reheating and tempering time was essential for the formation of ultrafine grained microstructure. |
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Microstructure evolution during warm deformation of low carbon steel with dispersed cementiteMartensiteUltrafine grainWarm deformationCarbon steelMicrostructureTorsion testingDeformationThe microstructure evolution and mechanical behavior during large strain of a 0.16%C-Mn steel has been investigated by warm torsion tests. These experiments were carried out at 685°C at equivalent strain rate of 0.1 s . The initial microstructure composed of a martensite matrix with uniformly dispersed fine cementite particles was attained by quenching and tempering. The microstructure evolution during tempering and straining was performed through interrupted tests. As the material was reheated to testing temperature, well-defined cell structure was created and subgrains within lath martensite were observed by TEM; strong recovery took place, decreasing the dislocation density. After 1 hour at the test temperature and without straining, EBSD technique showed the formation of new grains. The flow stress curves measured had a peculiar shape: rapid work hardening to a hump, followed by an extensive flow-softening region. 65% of the boundaries observed in the sample strained to ε = 1.0 were high angle grain boundaries. After straining to ε = 5.0, average ferrite grain size close to 1.5 μm was found, suggesting that dynamic recrystallization took place. Also, two sets of cementite particles were observed: large particles aligned with straining direction and smaller particles more uniformly dispersed. The fragmentation or grain subdivision that occurred during reheating and tempering time was essential for the formation of ultrafine grained microstructure.Depart. Mechanical Engineering São Paulo State University, Ilha Solteira, SPDepart. Materials Engineering Federal University of São Carlos, São Carlos, SPDepart. Mechanical Engineering São Paulo State University, Ilha Solteira, SPUniversidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)Gallego, J. [UNESP]Jorge, A. M.Balancin, O.2014-05-27T11:22:42Z2014-05-27T11:22:42Z2007-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject505-510http://dx.doi.org/10.4028/www.scientific.net/MSF.558-559.505Materials Science Forum, v. 558-559, n. PART 1, p. 505-510, 2007.0255-5476http://hdl.handle.net/11449/7010110.4028/www.scientific.net/MSF.558-559.505WOS:0002504080000782-s2.0-3834914045571938722948186890000-0002-5477-8139Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Science Forum0,180info:eu-repo/semantics/openAccess2021-10-22T20:49:00Zoai:repositorio.unesp.br:11449/70101Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T20:49Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
title |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
spellingShingle |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite Gallego, J. [UNESP] Martensite Ultrafine grain Warm deformation Carbon steel Microstructure Torsion testing Deformation |
title_short |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
title_full |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
title_fullStr |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
title_full_unstemmed |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
title_sort |
Microstructure evolution during warm deformation of low carbon steel with dispersed cementite |
author |
Gallego, J. [UNESP] |
author_facet |
Gallego, J. [UNESP] Jorge, A. M. Balancin, O. |
author_role |
author |
author2 |
Jorge, A. M. Balancin, O. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de São Carlos (UFSCar) |
dc.contributor.author.fl_str_mv |
Gallego, J. [UNESP] Jorge, A. M. Balancin, O. |
dc.subject.por.fl_str_mv |
Martensite Ultrafine grain Warm deformation Carbon steel Microstructure Torsion testing Deformation |
topic |
Martensite Ultrafine grain Warm deformation Carbon steel Microstructure Torsion testing Deformation |
description |
The microstructure evolution and mechanical behavior during large strain of a 0.16%C-Mn steel has been investigated by warm torsion tests. These experiments were carried out at 685°C at equivalent strain rate of 0.1 s . The initial microstructure composed of a martensite matrix with uniformly dispersed fine cementite particles was attained by quenching and tempering. The microstructure evolution during tempering and straining was performed through interrupted tests. As the material was reheated to testing temperature, well-defined cell structure was created and subgrains within lath martensite were observed by TEM; strong recovery took place, decreasing the dislocation density. After 1 hour at the test temperature and without straining, EBSD technique showed the formation of new grains. The flow stress curves measured had a peculiar shape: rapid work hardening to a hump, followed by an extensive flow-softening region. 65% of the boundaries observed in the sample strained to ε = 1.0 were high angle grain boundaries. After straining to ε = 5.0, average ferrite grain size close to 1.5 μm was found, suggesting that dynamic recrystallization took place. Also, two sets of cementite particles were observed: large particles aligned with straining direction and smaller particles more uniformly dispersed. The fragmentation or grain subdivision that occurred during reheating and tempering time was essential for the formation of ultrafine grained microstructure. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-12-01 2014-05-27T11:22:42Z 2014-05-27T11:22:42Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.4028/www.scientific.net/MSF.558-559.505 Materials Science Forum, v. 558-559, n. PART 1, p. 505-510, 2007. 0255-5476 http://hdl.handle.net/11449/70101 10.4028/www.scientific.net/MSF.558-559.505 WOS:000250408000078 2-s2.0-38349140455 7193872294818689 0000-0002-5477-8139 |
url |
http://dx.doi.org/10.4028/www.scientific.net/MSF.558-559.505 http://hdl.handle.net/11449/70101 |
identifier_str_mv |
Materials Science Forum, v. 558-559, n. PART 1, p. 505-510, 2007. 0255-5476 10.4028/www.scientific.net/MSF.558-559.505 WOS:000250408000078 2-s2.0-38349140455 7193872294818689 0000-0002-5477-8139 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Science Forum 0,180 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
505-510 |
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_ |
1803649970931236864 |