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Metals 2019, 9(3), 357; https://doi.org/10.3390/met9030357

Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process

1
Division of Materials Science, Luleå University of Technology, SE-97187 Luleå, Sweden
2
Gestamp HardTech AB, SE-97125 Luleå, Sweden
3
Centre for Advanced Steels Research, University of Oulu, FIN-90014 Oulu, Finland
4
Institut Jean Lamour, Université de Lorraine, BP-50840 Nancy, France
5
National Center for Metallurgical Research (CENIM-CSIC), E-28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 18 February 2019 / Revised: 16 March 2019 / Accepted: 18 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Advances in Low-carbon and Stainless Steels)
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Abstract

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. View Full-Text
Keywords: hot forming; multiphase steel; quenching and partitioning; austempering; Gleeble simulation; press hardening hot forming; multiphase steel; quenching and partitioning; austempering; Gleeble simulation; press hardening
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Vuorinen, E.P.; Özügürler, A.G.; Ion, J.C.; Eriksson, K.; Somani, M.C.; Karjalainen, L.P.; Allain, S.; Caballero, F.G. Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process. Metals 2019, 9, 357.

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