University of Oulu

Nousiainen, O., Hannula, J., Saukko, S., Kaijalainen, A. and Kömi, J. (2023), Evaluation of Strengthening Mechanisms in Novel Fully Ferritic Advanced High-Strength Steels. steel research int. 2300293.

Evaluation of strengthening mechanisms in novel fully ferritic advanced high-strength steels

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Author: Nousiainen, Olli1; Hannula, Jaakko1; Saukko, Sami2;
Organizations: 1Materials and Mechanical Engineering Unit, Centre for Advanced Steels Research, University of Oulu, Box 4200, FI-90014 Oulu, Finland
2Centre for Material Analysis, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: John Wiley & Sons, 2023
Publish Date: 2023-09-06


New steel alloying concepts are designed in order to produce a fully ferritic, low-alloy steel with high (1 GPa) ultimate tensile strength (TS). A simulated hot-deformation process of the Ti–Mo–V–Nb and Ti–Mo–V steels is designed for that purpose, and the strengthening mechanisms of the steels are evaluated after the isothermal dwell at three different temperatures (590, 630, and 680 °C). The TS and the yield strength (YS) of the test alloys are estimated via hardness measurements. Results show that the estimated TS of over 1000 MPa and YS of over 900 MPa can be achieved in both steels, although the contribution of different strengthening mechanisms to the YS varies between the steels. The effect of the dislocation strengthening can especially compensate the reduced effect of the precipitation strengthening at all tested coiling temperatures (CTs). Based on the results, a CT range of 590–630 °C with the 1800 s dwell time seems to be a potential process window for the studied steels after the present thermomechanically controlled processing (TMCP) route.

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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
DOI: 10.1002/srin.202300293
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The financial assistance of CBMM (Companhia Brasileira de Metalurgia e Mineracao) and Business Finland (project FOSSA—Fossil-Free Steel Applications) is gratefully acknowledged.
Copyright information: © 2023 The Authors. Steel Research International published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.