University of Oulu

Vuorinen, E., Özügürler, A., Ion, J., Eriksson, K., Somani, M., Karjalainen, L., … Caballero, F. (2019). Hot Forming of Ultra-Fine-Grained Multiphase Steel Products Using Press Hardening Combined with Quenching and Partitioning Process. Metals, 9(3), 357. doi:10.3390/met9030357

Hot forming of ultra-fine-grained multiphase steel products using press hardening combined with quenching and partitioning process

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Author: Vuorinen, Esa Pirkka1; Özügürler, Almila Gülfem1; Ion, John Christopher1;
Organizations: 1Division of Materials Science, Luleå University of Technology
2Gestamp HardTech AB
3Centre for Advanced Steels Research, University of Oulu
4Institut Jean Lamour, Université de Lorraine
5National Center for Metallurgical Research (CENIM-CSIC)
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.2 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2019
Publish Date: 2019-05-03


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.

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Series: Metals
ISSN: 2075-4701
ISSN-E: 2075-4701
ISSN-L: 2075-4701
Volume: 9
Issue: 3
Article number: 357
DOI: 10.3390/met9030357
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The European Research Fund for Coal and Steel, contract RFSR-CT-2008-00021, has funded this work.
Copyright information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (