Chemical Composition Optimization and Isothermal Transformation of ?-Transformation-Induced Plasticity Steel for the Third-Generation Advanced High-Strength Steel Grade

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dc.contributor.authorOkur, Onur
dc.contributor.authorDavut, Kemal
dc.contributor.authorPalumbo, Gianfranco
dc.contributor.authorNalcaci, Burak
dc.contributor.authorGuglielmi, Pasquale
dc.contributor.authorYalcin, Mustafa Alp
dc.contributor.authorCalin, Recep
dc.date.accessioned2025-01-21T16:36:33Z
dc.date.available2025-01-21T16:36:33Z
dc.date.issued2024
dc.departmentKırıkkale Üniversitesi
dc.description.abstractA new low-manganese transformation-induced plasticity steel is designed with optimized nickel content to achieve superior strength and ductility while minimizing the use of expensive nickel. The steel is optimized using JMatPro software, then cast, and hot rolled. To assess the effect of intercritical annealing on austenite (martensite at room temperature) volume fraction and carbon content, hot-rolled steel samples quenched from different annealing temperatures (680-1100 degrees C) are used. Additionally, hot-rolled steel coupons are intercritically annealed at about 50% austenite formation temperature (740 degrees C) and then subjected to isothermal treatments at 300-425 degrees C for varying times (10-90 min). After optimizing these treatments to maximize retained austenite (RA), tensile specimens are heat-treated first at 740 degrees C and then isothermally at 325 degrees C. Thermodynamic calculations suggest that aluminum combined with silicon may lead to the delta ferrite formation, and even minimal nickel content can stabilize a considerable amount of austenite. In the experimental studies, it is shown that lower-temperature bainitic holding enhances austenite stability by enriching the carbon content. Optimized two-stage heat treatments yield up to 25.8% RA, with a tensile strength of 867.2 MPa and elongation of 40.6%, achieving a strength-elongation product of 35.2 GPax%, surpassing the third-generation advanced high-strength steel grades minimum requirement of 30 GPax%.
dc.description.sponsorshipGazi niversitesi [2021/014]; Scientific Research Projects Coordination Unit of Kirikkale University [07/2019-22]; Gazi University Scientific Research Fund [7ZQEET4]; Metal Forming Center of Excellence, Atilim University and Materials Testing & Innovation Laboratories Company; Gazi University
dc.description.sponsorshipThis work was supported by the Scientific Research Projects Coordination Unit of Kirikkale University (project number: 2021/014) and the Gazi University Scientific Research Fund (grant no. 07/2019-22). The authors acknowledge the Metal Forming Center of Excellence, Atilim University and Materials Testing & Innovation Laboratories Company, Istanbul (MATIL), for providing the advanced characterization tools. The research activities presented in this paper were conducted in the framework of the project Innovative Mechanisms for Car Seat (project code: 7ZQEET4) of the company MFI ITALY ENGINEERING srl. The authors would like to thank Gazi University Academic Writing Application and Research Center for proofreading the article.
dc.identifier.doi10.1002/srin.202400648
dc.identifier.issn1611-3683
dc.identifier.issn1869-344X
dc.identifier.scopus2-s2.0-85210927659
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1002/srin.202400648
dc.identifier.urihttps://hdl.handle.net/20.500.12587/24329
dc.identifier.wosWOS:001371000600001
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley-V C H Verlag Gmbh
dc.relation.ispartofSteel Research International
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241229
dc.subjectcarbide-free bainites; isothermal bainitic holding treatments; retained austenites; third-generation advanced high-strength steel grades; transformation-induced plasticity effects
dc.titleChemical Composition Optimization and Isothermal Transformation of ?-Transformation-Induced Plasticity Steel for the Third-Generation Advanced High-Strength Steel Grade
dc.typeArticle

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