Effect of Cooling Practice on the Mechanical Properties of Medium‐Manganese Aluminum‐Alloyed Steels after Intercritical Annealing Quench and Partition Treatment
Ahmed, Shahroz; Oja, Olli; Kaijalainen, Antti; Peura, Pasi (2024-10-03)
Wiley-VCH Verlag
03.10.2024
Ahmed, S., Oja, O., Kaijalainen, A. and Peura, P. (2025), Effect of Cooling Practice on the Mechanical Properties of Medium-Manganese Aluminum-Alloyed Steels after Intercritical Annealing Quench and Partition Treatment. steel research int., 96: 2400420. https://doi.org/10.1002/srin.202400420
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). 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.
https://creativecommons.org/licenses/by/4.0/
© 2024 The Author(s). 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.
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202410076213
https://urn.fi/URN:NBN:fi:oulu-202410076213
Tiivistelmä
Abstract
This study reports the effect of different cooling practices after hot rolling on the microstructure and mechanical properties of intercritically annealed quench and partitioned low-carbon medium-manganese aluminum-alloyed steel. The outcomes show that the tensile strength and uniform elongation of medium-manganese steels can be improved by manipulating the cooling cycle after hot rolling. The starting microstructure, obtained after hot rolling and cooling, influences the fraction of austenite formed at the end of intercritical annealing, thereby impacting the fraction of martensite produced at the interrupted quenching step. The results illustrate that during intercritical annealing austenite tends to nucleate at a higher temperature from a ferritic microstructure compared to a microstructure consisting of mainly bainite or a mixture of ferrite, martensite, cementite, and retained austenite. Partition temperature of 400 °C facilitates the partition of carbon from martensite to austenite while partition temperature of 450 °C supports the formation of high carbon secondary martensite.
This study reports the effect of different cooling practices after hot rolling on the microstructure and mechanical properties of intercritically annealed quench and partitioned low-carbon medium-manganese aluminum-alloyed steel. The outcomes show that the tensile strength and uniform elongation of medium-manganese steels can be improved by manipulating the cooling cycle after hot rolling. The starting microstructure, obtained after hot rolling and cooling, influences the fraction of austenite formed at the end of intercritical annealing, thereby impacting the fraction of martensite produced at the interrupted quenching step. The results illustrate that during intercritical annealing austenite tends to nucleate at a higher temperature from a ferritic microstructure compared to a microstructure consisting of mainly bainite or a mixture of ferrite, martensite, cementite, and retained austenite. Partition temperature of 400 °C facilitates the partition of carbon from martensite to austenite while partition temperature of 450 °C supports the formation of high carbon secondary martensite.
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