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Open AccessFeature PaperArticle

Interaction between Microalloying Additions and Phase Transformation during Intercritical Deformation in Low Carbon Steels

1
Materials and Manufacturing Division, CEIT, 20018 San Sebastian, Basque Country, Spain
2
Mechanical and Materials Engineering Department, Universidad de Navarra, Tecnun, 20018 San Sebastian, Basque Country, Spain
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1049; https://doi.org/10.3390/met9101049
Received: 29 August 2019 / Revised: 20 September 2019 / Accepted: 25 September 2019 / Published: 27 September 2019
(This article belongs to the Special Issue Thermomechanical Processing of Steels)
Heavy gauge line pipe and structural steel plate materials are often rolled in the two-phase region for strength reasons. However, strength and toughness show opposite trends, and the exact effect of each rolling process parameter remains unclear. Even though intercritical rolling has been widely studied, the specific mechanisms that act when different microalloying elements are added remain unclear. To investigate this further, laboratory thermomechanical simulations reproducing intercritical rolling conditions were performed in plain low carbon and NbV-microalloyed steels. Based on a previously developed procedure using electron backscattered diffraction (EBSD), the discretization between intercritically deformed ferrite and new ferrite grains formed after deformation was extended to microalloyed steels. The austenite conditioning before intercritical deformation in the Nb-bearing steel affects the balance of final precipitates by modifying the size distributions and origin of the Nb (C, N). This fact could modify the substructure in the intercritically deformed grains. A simple transformation model is proposed to predict average grain sizes under intercritical deformation conditions. View Full-Text
Keywords: intercritical rolling; microalloying; microstructure; EBSD intercritical rolling; microalloying; microstructure; EBSD
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MDPI and ACS Style

Mayo, U.; Isasti, N.; Rodriguez-Ibabe, J.M.; Uranga, P. Interaction between Microalloying Additions and Phase Transformation during Intercritical Deformation in Low Carbon Steels. Metals 2019, 9, 1049.

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