Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties

In this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite aft...

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Autores: Torkamani, Hadi, Raygan, Shahram, García Mateo, Carlos, Rassizadehghani, Jafar, Vivas Méndez, Javier, San-Martín, David
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/259800
Acceso en línea:http://hdl.handle.net/10261/259800
Access Level:acceso abierto
Palabra clave:Cast low-carbon steel
Intercritical heat treatment
Dual-phase structure
Mechanical properties
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spelling Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical propertiesTorkamani, HadiRaygan, ShahramGarcía Mateo, CarlosRassizadehghani, JafarVivas Méndez, JavierSan-Martín, DavidCast low-carbon steelIntercritical heat treatmentDual-phase structureMechanical propertiesIn this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite after quenching) from 0.68 to 0.36; (ii) ~ 100 °C decrease in martensite start temperature (Ms), mainly due to the higher carbon content of austenite and its smaller grains at 750 °C; (iii) a reduction in the block size of martensite from 1.9 to 1.2 μm as measured by EBSD. Having a higher carbon content and a finer block size, the localized microhardness of martensite islands increases from 380 HV (800 °C) to 504 HV (750 °C). Moreover, despite the different volume fractions of martensite obtained in DP microstructures, the hardness of the steels remained unchanged by changing the IHT temperature (~ 234 to 238 HV). Applying lower IHT temperature (lower fraction of martensite), the impact energy even decreased from 12 to 9 J due to the brittleness of the martensite phase. The results of the tensile tests indicate that by increasing the IHT temperature, the yield and ultimate tensile strengths of the DP steel increase from 493 to 770 MPa, and from 908 to 1080 MPa, respectively, while the total elongation decreases from 9.8 to 4.5%. In contrast to the normalized sample, formation of martensite in the DP steels could eliminate the yield point phenomenon in the tensile curves, as it generates free dislocations in adjacent ferrite.The authors are grateful to the Phase Transformations and Microscopy labs from CENIM-CSIC. Mr. Javier Vara Miñambres from the Phase Transformations lab (CENIM-CSIC) is gratefully acknowledged for his continuous experimental support. J. Vivas acknowledges financial support in the form of a FPI Grant BES-2014-069863 from the Ministerio de Economia y Competitividad (MINECO). Open access funding provided by Lulea University of Technology.Springer NatureMinisterio de Economía y Competitividad (España)Luleå University of TechnologyConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/259800reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1007/s43452-021-00222-6Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2598002026-05-22T06:33:51Z
dc.title.none.fl_str_mv Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
title Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
spellingShingle Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
Torkamani, Hadi
Cast low-carbon steel
Intercritical heat treatment
Dual-phase structure
Mechanical properties
title_short Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
title_full Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
title_fullStr Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
title_full_unstemmed Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
title_sort Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties
dc.creator.none.fl_str_mv Torkamani, Hadi
Raygan, Shahram
García Mateo, Carlos
Rassizadehghani, Jafar
Vivas Méndez, Javier
San-Martín, David
author Torkamani, Hadi
author_facet Torkamani, Hadi
Raygan, Shahram
García Mateo, Carlos
Rassizadehghani, Jafar
Vivas Méndez, Javier
San-Martín, David
author_role author
author2 Raygan, Shahram
García Mateo, Carlos
Rassizadehghani, Jafar
Vivas Méndez, Javier
San-Martín, David
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Luleå University of Technology
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Cast low-carbon steel
Intercritical heat treatment
Dual-phase structure
Mechanical properties
topic Cast low-carbon steel
Intercritical heat treatment
Dual-phase structure
Mechanical properties
description In this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite after quenching) from 0.68 to 0.36; (ii) ~ 100 °C decrease in martensite start temperature (Ms), mainly due to the higher carbon content of austenite and its smaller grains at 750 °C; (iii) a reduction in the block size of martensite from 1.9 to 1.2 μm as measured by EBSD. Having a higher carbon content and a finer block size, the localized microhardness of martensite islands increases from 380 HV (800 °C) to 504 HV (750 °C). Moreover, despite the different volume fractions of martensite obtained in DP microstructures, the hardness of the steels remained unchanged by changing the IHT temperature (~ 234 to 238 HV). Applying lower IHT temperature (lower fraction of martensite), the impact energy even decreased from 12 to 9 J due to the brittleness of the martensite phase. The results of the tensile tests indicate that by increasing the IHT temperature, the yield and ultimate tensile strengths of the DP steel increase from 493 to 770 MPa, and from 908 to 1080 MPa, respectively, while the total elongation decreases from 9.8 to 4.5%. In contrast to the normalized sample, formation of martensite in the DP steels could eliminate the yield point phenomenon in the tensile curves, as it generates free dislocations in adjacent ferrite.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/259800
url http://hdl.handle.net/10261/259800
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1007/s43452-021-00222-6
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
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 15,812429

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