Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel

The novel use of double austempering treatments in a multiphase steel to refine and homogenize the final microstructure and thus improve the material strength have been studied in the 3.3Mn-0.17C-1.6Al-0.23Mo-0.22Si alloy. The microstructural features developed after conventional isothermal austempe...

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Authors: Skowronek, A., Cordova-Tapia, Erick, Tobajas-Balsera, P., García Mateo, Carlos, Jiménez, José Antonio, Petrov, Roumen, Grajcar, Adam
Format: article
Status:Published version
Publication Date:2022
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/287496
Online Access:http://hdl.handle.net/10261/287496
Access Level:Open access
Keyword:Double austempering
Bainitic transformation
Plate thickness reduction
Microstructure tailoring
Medium-Mn steels
Strength improvement
Retained austenite morphology
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spelling Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steelSkowronek, A.Cordova-Tapia, ErickTobajas-Balsera, P.García Mateo, CarlosJiménez, José AntonioPetrov, RoumenGrajcar, AdamDouble austemperingBainitic transformationPlate thickness reductionMicrostructure tailoringMedium-Mn steelsStrength improvementRetained austenite morphologyThe novel use of double austempering treatments in a multiphase steel to refine and homogenize the final microstructure and thus improve the material strength have been studied in the 3.3Mn-0.17C-1.6Al-0.23Mo-0.22Si alloy. The microstructural features developed after conventional isothermal austempering treatments at 450 °C and 400 °C were compared with those obtained after two-step heat treatments. These treatments consisted of a first isothermal holding at a temperature slightly above the initial M, that was interrupted at 25 and 50% of transformation, followed by a second stage treatment at a lower temperature to complete the bainitic transformation. One- and two-step treatments were performed in a high-resolution dilatometer, and the critical transformation temperatures and phase transformation kinetics were determined from the longitudinal changes recorded during these tests. It was shown that blocky-type austenite was almost completely eliminated after the two-step treatments, which in turn positively reduced the amount of fresh martensite from ∼6 to «1%. It was possible to keep the volume fraction of retained austenite above 10%, while reducing both the thickness of the bainitic plates and the film-like retained austenite by 20% and more than 40%, respectively. These microstructural characteristics made it possible to increase the hardness of the alloy by approximately 50 HV and yield strength by 180 MPa.Adam Skowronek is a holder of European Union scholarship through the European Social Fund, grant InterPOWER (POWR.03.05.00–00-Z305). Publication supported under the Rector's pro-quality grant. Silesian University of Technology, grant no. 10/010/RGJ21/1034.Elsevier BVSilesian University of TechnologyConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2023202320222023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/287496reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.msea.2022.143743Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2874962026-05-22T06:33:51Z
dc.title.none.fl_str_mv Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
title Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
spellingShingle Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
Skowronek, A.
Double austempering
Bainitic transformation
Plate thickness reduction
Microstructure tailoring
Medium-Mn steels
Strength improvement
Retained austenite morphology
title_short Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
title_full Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
title_fullStr Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
title_full_unstemmed Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
title_sort Bainite plate thickness reduction and microstructure tailoring by double austempering of Al-rich 3Mn steel
dc.creator.none.fl_str_mv Skowronek, A.
Cordova-Tapia, Erick
Tobajas-Balsera, P.
García Mateo, Carlos
Jiménez, José Antonio
Petrov, Roumen
Grajcar, Adam
author Skowronek, A.
author_facet Skowronek, A.
Cordova-Tapia, Erick
Tobajas-Balsera, P.
García Mateo, Carlos
Jiménez, José Antonio
Petrov, Roumen
Grajcar, Adam
author_role author
author2 Cordova-Tapia, Erick
Tobajas-Balsera, P.
García Mateo, Carlos
Jiménez, José Antonio
Petrov, Roumen
Grajcar, Adam
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Silesian University of Technology
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Double austempering
Bainitic transformation
Plate thickness reduction
Microstructure tailoring
Medium-Mn steels
Strength improvement
Retained austenite morphology
topic Double austempering
Bainitic transformation
Plate thickness reduction
Microstructure tailoring
Medium-Mn steels
Strength improvement
Retained austenite morphology
description The novel use of double austempering treatments in a multiphase steel to refine and homogenize the final microstructure and thus improve the material strength have been studied in the 3.3Mn-0.17C-1.6Al-0.23Mo-0.22Si alloy. The microstructural features developed after conventional isothermal austempering treatments at 450 °C and 400 °C were compared with those obtained after two-step heat treatments. These treatments consisted of a first isothermal holding at a temperature slightly above the initial M, that was interrupted at 25 and 50% of transformation, followed by a second stage treatment at a lower temperature to complete the bainitic transformation. One- and two-step treatments were performed in a high-resolution dilatometer, and the critical transformation temperatures and phase transformation kinetics were determined from the longitudinal changes recorded during these tests. It was shown that blocky-type austenite was almost completely eliminated after the two-step treatments, which in turn positively reduced the amount of fresh martensite from ∼6 to «1%. It was possible to keep the volume fraction of retained austenite above 10%, while reducing both the thickness of the bainitic plates and the film-like retained austenite by 20% and more than 40%, respectively. These microstructural characteristics made it possible to increase the hardness of the alloy by approximately 50 HV and yield strength by 180 MPa.
publishDate 2022
dc.date.none.fl_str_mv 2022
2023
2023
2023
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/10261/287496
url http://hdl.handle.net/10261/287496
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.msea.2022.143743
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
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 15,81155

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