Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness

THE 9th INTERNATIONAL CONFERENCE ON HIGH STRENGTH LOW ALLOY STEELS NANJING, JIANGSU PROVINCE, CHINA

Detalles Bibliográficos
Autores: Rana, Radhakanta, Morales-Rivas, Lucía, Jiménez, José Antonio, García Mateo, Carlos
Tipo de recurso: otro
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/424968
Acceso en línea:http://hdl.handle.net/10261/424968
Access Level:acceso abierto
Palabra clave:Hot rolled
Bainite
Austenite stability
Microstructure
Mechanical properties
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spelling Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and ToughnessRana, RadhakantaMorales-Rivas, LucíaJiménez, José AntonioGarcía Mateo, CarlosHot rolledBainiteAustenite stabilityMicrostructureMechanical propertiesTHE 9th INTERNATIONAL CONFERENCE ON HIGH STRENGTH LOW ALLOY STEELS NANJING, JIANGSU PROVINCE, CHINAThis research presents the development and comprehensive evaluation of high-silicon (1.5–2.5wt.%) carbide-free bainitic (CFB) steels engineered for industrial hot rolling, targeting coiling temperatures of 310℃ and 350℃. Designed to meet the automotive industry’s demand for materials with both ultrahigh strength and enhanced toughness, these novel steels utilize elevated silicon content to suppress cementite formation and optimize bainitic microstructures with retained austenite. Four distinct steel compositions, produced via vacuum induction melting, were hot rolled to final thicknesses of 3mm and 12 mm under industrially relevant cooling regimes. Microstructure characterization by SEM and XRD revealed bainitic ferrite fractions of 60–95%, with variable amounts of retained austenite (2–17%), fresh martensite (3–20%), and tempered martensite (0–13%), depending on coiling temperature. Lower coiling at 310℃ promoted finer microstructures with higher hardness and carbon-enriched austenite. Mechanical testing demonstrated ultimate tensile strengths of 1409–1644 MPa and total elongations up to 19.3%. The steels exhibited excellent low-temperature impact toughness, exceeding 27 J at –40℃, and superior notch resistance and crack initiation delay in Kahn tear tests, especially for samples coiled at 310℃. The research successfully identifies processing parameters and alloy designs for CFB steels that achieve an exceptional synergy of strength, ductility, and toughness—attributes highly desirable for next-generation automotive structural components.Chinese Society for MetalsConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2026202620252026info:eu-repo/semantics/otherhttp://purl.org/coar/resource_type/c_3248info:eu-repo/semantics/bookParthttp://hdl.handle.net/10261/424968reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)http://en.csm.org.cn/col/col7680/art/2024/art_ab6adc462ec84511a8bfed26584f3250.htmlSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4249682026-05-22T06:33:51Z
dc.title.none.fl_str_mv Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
title Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
spellingShingle Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
Rana, Radhakanta
Hot rolled
Bainite
Austenite stability
Microstructure
Mechanical properties
title_short Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
title_full Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
title_fullStr Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
title_full_unstemmed Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
title_sort Engineering Carbide-Free Bainitic Steels with High Silicon for Superior Strength and Toughness
dc.creator.none.fl_str_mv Rana, Radhakanta
Morales-Rivas, Lucía
Jiménez, José Antonio
García Mateo, Carlos
author Rana, Radhakanta
author_facet Rana, Radhakanta
Morales-Rivas, Lucía
Jiménez, José Antonio
García Mateo, Carlos
author_role author
author2 Morales-Rivas, Lucía
Jiménez, José Antonio
García Mateo, Carlos
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Hot rolled
Bainite
Austenite stability
Microstructure
Mechanical properties
topic Hot rolled
Bainite
Austenite stability
Microstructure
Mechanical properties
description THE 9th INTERNATIONAL CONFERENCE ON HIGH STRENGTH LOW ALLOY STEELS NANJING, JIANGSU PROVINCE, CHINA
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/other
http://purl.org/coar/resource_type/c_3248
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format other
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/424968
url http://hdl.handle.net/10261/424968
dc.relation.none.fl_str_mv http://en.csm.org.cn/col/col7680/art/2024/art_ab6adc462ec84511a8bfed26584f3250.html
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Chinese Society for Metals
publisher.none.fl_str_mv Chinese Society for Metals
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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