Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel

Casting processes show some weaknesses. A particular problem is presented when the workpiece needs to be subjected to heat treatments to achieve a desired microstructure. This problem arises from the microsegregation phenomena typically present in cast parts. The effect of the microsegregation on th...

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Autores: Basso, A. D., Toda Caraballo, Isaac, Eres-Castellanos, Adriana, San-Martín, David, Jiménez, José Antonio, García Caballero, Francisca
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/218248
Acesso em linha:http://hdl.handle.net/10261/218248
Access Level:acceso abierto
Palavra-chave:Microsegregation
Prior austenite grain size
Bainitic transformation
High carbon-high silicon cast steel
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spelling Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steelBasso, A. D.Toda Caraballo, IsaacEres-Castellanos, AdrianaSan-Martín, DavidJiménez, José AntonioGarcía Caballero, FranciscaMicrosegregationPrior austenite grain sizeBainitic transformationHigh carbon-high silicon cast steelCasting processes show some weaknesses. A particular problem is presented when the workpiece needs to be subjected to heat treatments to achieve a desired microstructure. This problem arises from the microsegregation phenomena typically present in cast parts. The effect of the microsegregation on the martensitic and bainitic transformations has been investigated in a high carbon-high silicon cast steel, with the approximate composition Fe-0.8C-2Si-1Mn-1Cr (in wt. %), which was poured into 25 mm keel block-shaped sand molds. The microsegregation maps of Cr, Si, and Mn characterized by electron probe microanalysis (EPMA) show that interdendritic regions are enriched while dendrites are impoverished in these elements, implying that their partition coefficients are lower that the unity (k < 1). As-quenched martensitic and austempered bainitic microstructures (at 230 ⁰C) were obtained and analyzed after applying an austenitization heat treatment at 920 ⁰C (holding for 60 min). The thermal etching method used to reveal the prior austenite grain size showed a bimodal grain size distribution, with larger grains in the dendritic regions (≈22.4µm) than in the interdendritic ones (≈6.4 µm). This is likely due to both the microsegregation and the presence of small undissolved cementite precipitates. Electron Backscatter Diffraction (EBSD) analysis carried out on the martensitic microstructure do not unveil any differences in misorientation distribution frequency and block size between the dendritic and interdendritic zones related to the microsegregation and bimodality of the austenite grain size. On the contrary, the bainitic transformation starts earlier (incubation time of 80 min), proceeds faster and bainitic ferrite plates are longer in the dendritic zones, were prior austenite grains are larger and impoverish in solute. The presence of these microsegregation pattern leads to the non-uniform development of the bainitic reaction in cast parts, modifying its kinetics and the resulting microstructures, which would probably have a major impact on the mechanical properties.This work has been supported by CONICET, ANPCyT and MINCyT of Argentina [Project PICT 12-1146]. Some of the authors (ITC, DSM, FGC) also acknowledge financial support from the Ministerio de Economia y Competitividad (MINECO) in the form of a Coordinate Project (MAT2016-80875-C3-1-R) and to the Comunidad de Madrid through P2018/NMT4381project. ITC is also grateful for financial support in the form of a fellowship 2016-T2/IND-1693, from the Programme Atracción de Talento Investigador (Conserjería de Educación, Juventud y Deporte, Comunidad de Madrid).Multidisciplinary Digital Publishing InstituteMinisterio de Economía y Competitividad (España)Comunidad de MadridConsejo Nacional de Investigaciones Científicas y Técnicas (Argentina)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/218248reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-80875-C3-1-RP2018/NMT-4381/MAT4.0-CMhttps://doi.org/10.3390/met10050574Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2182482026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
title Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
spellingShingle Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
Basso, A. D.
Microsegregation
Prior austenite grain size
Bainitic transformation
High carbon-high silicon cast steel
title_short Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
title_full Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
title_fullStr Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
title_full_unstemmed Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
title_sort Effect of the microsegregation on martensitic and bainitic reactions in a high carbon-high silicon cast steel
dc.creator.none.fl_str_mv Basso, A. D.
Toda Caraballo, Isaac
Eres-Castellanos, Adriana
San-Martín, David
Jiménez, José Antonio
García Caballero, Francisca
author Basso, A. D.
author_facet Basso, A. D.
Toda Caraballo, Isaac
Eres-Castellanos, Adriana
San-Martín, David
Jiménez, José Antonio
García Caballero, Francisca
author_role author
author2 Toda Caraballo, Isaac
Eres-Castellanos, Adriana
San-Martín, David
Jiménez, José Antonio
García Caballero, Francisca
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Microsegregation
Prior austenite grain size
Bainitic transformation
High carbon-high silicon cast steel
topic Microsegregation
Prior austenite grain size
Bainitic transformation
High carbon-high silicon cast steel
description Casting processes show some weaknesses. A particular problem is presented when the workpiece needs to be subjected to heat treatments to achieve a desired microstructure. This problem arises from the microsegregation phenomena typically present in cast parts. The effect of the microsegregation on the martensitic and bainitic transformations has been investigated in a high carbon-high silicon cast steel, with the approximate composition Fe-0.8C-2Si-1Mn-1Cr (in wt. %), which was poured into 25 mm keel block-shaped sand molds. The microsegregation maps of Cr, Si, and Mn characterized by electron probe microanalysis (EPMA) show that interdendritic regions are enriched while dendrites are impoverished in these elements, implying that their partition coefficients are lower that the unity (k < 1). As-quenched martensitic and austempered bainitic microstructures (at 230 ⁰C) were obtained and analyzed after applying an austenitization heat treatment at 920 ⁰C (holding for 60 min). The thermal etching method used to reveal the prior austenite grain size showed a bimodal grain size distribution, with larger grains in the dendritic regions (≈22.4µm) than in the interdendritic ones (≈6.4 µm). This is likely due to both the microsegregation and the presence of small undissolved cementite precipitates. Electron Backscatter Diffraction (EBSD) analysis carried out on the martensitic microstructure do not unveil any differences in misorientation distribution frequency and block size between the dendritic and interdendritic zones related to the microsegregation and bimodality of the austenite grain size. On the contrary, the bainitic transformation starts earlier (incubation time of 80 min), proceeds faster and bainitic ferrite plates are longer in the dendritic zones, were prior austenite grains are larger and impoverish in solute. The presence of these microsegregation pattern leads to the non-uniform development of the bainitic reaction in cast parts, modifying its kinetics and the resulting microstructures, which would probably have a major impact on the mechanical properties.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020
2020
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/10261/218248
url http://hdl.handle.net/10261/218248
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-80875-C3-1-R
P2018/NMT-4381/MAT4.0-CM
https://doi.org/10.3390/met10050574
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
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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