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Article

Effect of Dynamic Recrystallization on Microstructural Evolution in B Steels Microalloyed with Nb and/or Mo

1
Materials and Manufacturing Division, CEIT-Basque Research and Technology Alliance (BRTA), 20018 Donostia-Saint Sebastian, Basque Country, Spain
2
Mechanical and Materials Engineering Department, Universidad de Navarra, Tecnun, 20018 Donostia-Saint Sebastian, Basque Country, Spain
3
Aktien-Gesellschaft der Dillinger Hüttenwerke, 66763 Dillingen/Saar, Germany
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NiobelCon BV, 2970 Schilde, Belgium
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Department of Materials Engineering (MTM), KU Leuven, 3001 Leuven, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Ivo Schindler
Materials 2022, 15(4), 1424; https://doi.org/10.3390/ma15041424
Received: 26 January 2022 / Revised: 8 February 2022 / Accepted: 10 February 2022 / Published: 15 February 2022
(This article belongs to the Special Issue Hot Deformation and Microstructure Evolution of Metallic Materials)
The dynamic recrystallization behavior of ultra-high strength boron-microalloyed steels optionally alloyed with niobium and molybdenum is analyzed in this paper. Multipass torsion tests were performed to simulate plate rolling conditions followed by direct quenching. The influence of alloy composition on the transformed microstructure was evaluated by means of EBSD, thereby characterizing the morphology of the austenite grain morphology after roughing and finishing passes. The results indicated that for Nb-microalloyed steel, partial dynamic recrystallization occurred and resulted in local clusters of fine-sized equiaxed grains dispersed within the pancaked austenitic structure. A recrystallized austenite fraction appeared and transformed into softer phase constituents after direct quenching. The addition of Mo was shown to be an effective means of suppressing dynamic recrystallization. This effect of molybdenum in addition to its established hardenability effects hence safeguards the formation of fully martensitic microstructures, particularly in direct quenching processes. Additionally, the circumstances initiating dynamic recrystallization were studied in more detail, and the interference of the various alloying elements with the observed phenomena and the potential consequences of dynamic recrystallization before quenching are discussed. View Full-Text
Keywords: austenite conditioning; multipass torsion tests; dynamic recrystallization; Nb–Mo-microalloyed steels austenite conditioning; multipass torsion tests; dynamic recrystallization; Nb–Mo-microalloyed steels
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MDPI and ACS Style

Zurutuza, I.; Isasti, N.; Detemple, E.; Schwinn, V.; Mohrbacher, H.; Uranga, P. Effect of Dynamic Recrystallization on Microstructural Evolution in B Steels Microalloyed with Nb and/or Mo. Materials 2022, 15, 1424. https://doi.org/10.3390/ma15041424

AMA Style

Zurutuza I, Isasti N, Detemple E, Schwinn V, Mohrbacher H, Uranga P. Effect of Dynamic Recrystallization on Microstructural Evolution in B Steels Microalloyed with Nb and/or Mo. Materials. 2022; 15(4):1424. https://doi.org/10.3390/ma15041424

Chicago/Turabian Style

Zurutuza, Irati, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, and Pello Uranga. 2022. "Effect of Dynamic Recrystallization on Microstructural Evolution in B Steels Microalloyed with Nb and/or Mo" Materials 15, no. 4: 1424. https://doi.org/10.3390/ma15041424

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