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Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-9100-7982
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Gestamp HardTech AB, Luleå, Sweden.
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2019 (English)In: Metals, ISSN 2075-4701, Vol. 9, no 3, article id 357Article in journal (Refereed) Published
Abstract [en]

Hot forming combined with austempering and quenching and partitioning (QP) processes have been used to shape two cold rolled high silicon steel sheets into hat profiles. Thermal simulation on a Gleeble instrument was employed to optimize processing variables to achieve an optimum combination of strength and ductility in the final parts. Microstructures were characterized using optical and scanning electron microscopy and X-ray diffraction. Tensile strengths (Rm) of 1190 and 1350 MPa and elongations to fracture (A50mm) of 8.5 and 7.4%, were achieved for the two high-silicon steels having 0.15 and 0.26 wt % C, respectively. Preliminary results show that press hardening together with a QP heat treatment is an effective method of producing components with high strength and reasonable tensile ductility from low carbon containing steels that have the potential for carbide free bainite formation. The QP treatment resulted in faster austenite decomposition during partitioning in the steels in comparison with an austempering treatment.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 3, article id 357
Keywords [en]
hot forming, multiphase steel, quenching and partitioning, austempering, Gleeble simulation, press hardening
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-73787DOI: 10.3390/met9030357ISI: 000464321200008Scopus ID: 2-s2.0-85064219072OAI: oai:DiVA.org:ltu-73787DiVA, id: diva2:1308005
Note

Validerad;2019;Nivå 2;2019-04-30 (johcin)

Available from: 2019-04-30 Created: 2019-04-30 Last updated: 2019-04-30Bibliographically approved

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Vuorinen, EsaIon, John

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  • apa
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