Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.matchar.2021.111567 http://hdl.handle.net/11449/222864 |
Resumo: | Understanding the kinetics of microstructural degradation during the event of a fire is of major relevance to future optimization of fire-resistant steels (FRS). In this work, we use in situ synchrotron X-ray diffraction to assess the rapid thermally-assisted degradation of different starting microstructures, such as (i) ferrite + pearlite; (ii) bainite + retained austenite, and (iii) martensite + retained austenite, during the simulation of a fire cycle in a Fe-0.13C-0.11Cr-0.38Mo-0.04V FRS. Our results show that retained austenite is the most unstable phase, especially when generated by faster cooling rates, decomposing at temperatures as low as 180 °C during fire simulations. Bainite and martensite are both unstable and undergo recovery and carbon desaturation via secondary precipitation of cementite. However, bainite is comparatively more stable than martensite since its decomposition starts at 400 °C, while for martensite it occurs at 320 °C. We also present a methodology to deconvolute the effect of temperature on the increased background and signal intensities of the X-ray spectra, allowing the direct observation of the kinetics of secondary cementite precipitation. |
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Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steelFire-resistant steelRetained austeniteSecondary cementiteSynchrotron X-ray diffractionUnderstanding the kinetics of microstructural degradation during the event of a fire is of major relevance to future optimization of fire-resistant steels (FRS). In this work, we use in situ synchrotron X-ray diffraction to assess the rapid thermally-assisted degradation of different starting microstructures, such as (i) ferrite + pearlite; (ii) bainite + retained austenite, and (iii) martensite + retained austenite, during the simulation of a fire cycle in a Fe-0.13C-0.11Cr-0.38Mo-0.04V FRS. Our results show that retained austenite is the most unstable phase, especially when generated by faster cooling rates, decomposing at temperatures as low as 180 °C during fire simulations. Bainite and martensite are both unstable and undergo recovery and carbon desaturation via secondary precipitation of cementite. However, bainite is comparatively more stable than martensite since its decomposition starts at 400 °C, while for martensite it occurs at 320 °C. We also present a methodology to deconvolute the effect of temperature on the increased background and signal intensities of the X-ray spectra, allowing the direct observation of the kinetics of secondary cementite precipitation.Companhia Brasileira de Metalurgia e MineraçãoLaboratório Nacional de NanotecnologiaFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação para a Ciência e a TecnologiaMetallurgical and Materials Engineering Department University of São Paulo, Av. Prof. Mello MoraesEscuela de Tecnología Mecánica Universidad Tecnológica de Pereira, Carrera 27 #10-02 Alamos, PereiraMetallurgical Processes Laboratory Institute for Technological Research, Av. Prof. Almeida PradoInstitute of Materials Physics Helmholtz-Zentrum Hereon, Max-Planck-Str. 1UNIDEMI Department of Mechanical and Industrial Engineering NOVA School of Science and Technology Universidade NOVA de LisboaSão Paulo State University (UNESP) Campus of São João da Boa Vista, Av. Profª Isette Corrêa Fontão, 505, Jardim das FloresSão Paulo State University (UNESP) Campus of São João da Boa Vista, Av. Profª Isette Corrêa Fontão, 505, Jardim das FloresFAPESP: 2017/17697-5FAPESP: 2018/21251-5FAPESP: 2019/00691-0Fundação para a Ciência e a Tecnologia: UID/00667/2020Universidade de São Paulo (USP)Universidad Tecnológica de PereiraInstitute for Technological ResearchHelmholtz-Zentrum HereonUniversidade NOVA de LisboaUniversidade Estadual Paulista (UNESP)Escobar, J. D.Delfino, P. M.Ariza-Echeverri, E. A.Carvalho, F. M.Schell, N.Stark, A.Rodrigues, T. A.Oliveira, J. P.Avila, J. A. [UNESP]Goldenstein, H.Tschiptschin, A. P.2022-04-28T19:47:12Z2022-04-28T19:47:12Z2021-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.matchar.2021.111567Materials Characterization, v. 182.1044-5803http://hdl.handle.net/11449/22286410.1016/j.matchar.2021.1115672-s2.0-85119084084Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Characterizationinfo:eu-repo/semantics/openAccess2022-04-28T19:47:12Zoai:repositorio.unesp.br:11449/222864Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:47:12Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
title |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
spellingShingle |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel Escobar, J. D. Fire-resistant steel Retained austenite Secondary cementite Synchrotron X-ray diffraction |
title_short |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
title_full |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
title_fullStr |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
title_full_unstemmed |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
title_sort |
Response of ferrite, bainite, martensite, and retained austenite to a fire cycle in a fire-resistant steel |
author |
Escobar, J. D. |
author_facet |
Escobar, J. D. Delfino, P. M. Ariza-Echeverri, E. A. Carvalho, F. M. Schell, N. Stark, A. Rodrigues, T. A. Oliveira, J. P. Avila, J. A. [UNESP] Goldenstein, H. Tschiptschin, A. P. |
author_role |
author |
author2 |
Delfino, P. M. Ariza-Echeverri, E. A. Carvalho, F. M. Schell, N. Stark, A. Rodrigues, T. A. Oliveira, J. P. Avila, J. A. [UNESP] Goldenstein, H. Tschiptschin, A. P. |
author2_role |
author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidad Tecnológica de Pereira Institute for Technological Research Helmholtz-Zentrum Hereon Universidade NOVA de Lisboa Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Escobar, J. D. Delfino, P. M. Ariza-Echeverri, E. A. Carvalho, F. M. Schell, N. Stark, A. Rodrigues, T. A. Oliveira, J. P. Avila, J. A. [UNESP] Goldenstein, H. Tschiptschin, A. P. |
dc.subject.por.fl_str_mv |
Fire-resistant steel Retained austenite Secondary cementite Synchrotron X-ray diffraction |
topic |
Fire-resistant steel Retained austenite Secondary cementite Synchrotron X-ray diffraction |
description |
Understanding the kinetics of microstructural degradation during the event of a fire is of major relevance to future optimization of fire-resistant steels (FRS). In this work, we use in situ synchrotron X-ray diffraction to assess the rapid thermally-assisted degradation of different starting microstructures, such as (i) ferrite + pearlite; (ii) bainite + retained austenite, and (iii) martensite + retained austenite, during the simulation of a fire cycle in a Fe-0.13C-0.11Cr-0.38Mo-0.04V FRS. Our results show that retained austenite is the most unstable phase, especially when generated by faster cooling rates, decomposing at temperatures as low as 180 °C during fire simulations. Bainite and martensite are both unstable and undergo recovery and carbon desaturation via secondary precipitation of cementite. However, bainite is comparatively more stable than martensite since its decomposition starts at 400 °C, while for martensite it occurs at 320 °C. We also present a methodology to deconvolute the effect of temperature on the increased background and signal intensities of the X-ray spectra, allowing the direct observation of the kinetics of secondary cementite precipitation. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-01 2022-04-28T19:47:12Z 2022-04-28T19:47:12Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.matchar.2021.111567 Materials Characterization, v. 182. 1044-5803 http://hdl.handle.net/11449/222864 10.1016/j.matchar.2021.111567 2-s2.0-85119084084 |
url |
http://dx.doi.org/10.1016/j.matchar.2021.111567 http://hdl.handle.net/11449/222864 |
identifier_str_mv |
Materials Characterization, v. 182. 1044-5803 10.1016/j.matchar.2021.111567 2-s2.0-85119084084 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Characterization |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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_ |
1797790339243704320 |