Evaluation of Strengthening Mechanisms in Novel Fully Ferritic Advanced High‐Strength Steels
Nousiainen, Olli; Hannula, Jaakko; Saukko, Sami; Kaijalainen, Antti; Kömi, Jukka (2023-08-11)
Nousiainen, Olli
Hannula, Jaakko
Saukko, Sami
Kaijalainen, Antti
Kömi, Jukka
John Wiley & Sons
11.08.2023
Nousiainen, O., Hannula, J., Saukko, S., Kaijalainen, A. and Kömi, J. (2024), Evaluation of Strengthening Mechanisms in Novel Fully Ferritic Advanced High-Strength Steels. steel research int., 95: 2300293. https://doi.org/10.1002/srin.202300293
https://creativecommons.org/licenses/by/4.0/
© 2023 The Authors. Steel Research International published by Wiley-VCHGmbH. 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.
https://creativecommons.org/licenses/by/4.0/
© 2023 The Authors. Steel Research International published by Wiley-VCHGmbH. 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.
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20230906120658
https://urn.fi/URN:NBN:fi-fe20230906120658
Tiivistelmä
Abstract
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.
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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