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  Mechanisms of austenite growth during intercritical annealing in medium manganese steels

Varanasi, R. S., Lipińska-Chwałek, M., Mayer, J., Gault, B., & Ponge, D. (2022). Mechanisms of austenite growth during intercritical annealing in medium manganese steels. Scripta Materialia, 206: 114228. doi:10.1016/j.scriptamat.2021.114228.

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Varanasi, Rama Srinivas1, Author              
Lipińska-Chwałek, Marta2, 3, Author              
Mayer, Joachim4, 5, Author              
Gault, Baptiste6, 7, Author              
Ponge, Dirk1, Author              
Affiliations:
1Mechanism-based Alloy Design, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
2Central Facility for Electron Microscopy, RWTH Aachen University, Germany, ou_persistent22              
3Ernst Ruska-Centre (ER-C) for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, Jülich 52425, Germany, ou_persistent22              
4Central Facility for Electron Microscopy, RWTH Aachen University, Aachen, Germany, ou_persistent22              
5Ernst Ruska-Centre, Forschungszentrum Jülich, Germany, ou_persistent22              
6Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
7Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK, ou_persistent22              

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Free keywords: Annealing; Austenite; Cold rolled steel; Cold rolling; Diffusion; Grain boundaries; Martensite; Metal cladding; Steel sheet, Bulk diffusions; Diffusion paths; High strength; Intercritical annealing; Mis-orientation; Pipe diffusion; Third generation; Ultra-fine-grained, Manganese steel
 Abstract: The third-generation advanced high strength medium manganese (3–12 wt.) steels typically consist of ultrafine-grained dual-phase (austenite-ferrite) microstructure, obtained through the intercritical annealing of martensite at temperatures typically ≤ 0.5Tmelt, where the bulk diffusion of Mn is extremely slow. Yet, the manganese partitioning plays a prominent role in the austenite growth from the martensitic matrix during this annealing step. Therefore, the ‘short circuit’ diffusion paths provided by grain boundaries (GBs) and dislocations must be crucial to the austenite growth. However, this influence is not well understood across the literature. In the present work, we study the mechanisms of austenite growth in a cold-rolled intercritically annealed medium manganese steel of composition Fe-10Mn-0.05C–1.5Al (wt.). We provide evidence of manganese transport to austenite through GB diffusion, GB migration and dislocation pipe diffusion. Furthermore, the influence of GB misorientation on austenite growth is also reported. © 2021

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 Dates: 2022-01-01
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scriptamat.2021.114228
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Title: Scripta Materialia
  Abbreviation : Scripta Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B. V.
Pages: - Volume / Issue: 206 Sequence Number: 114228 Start / End Page: - Identifier: ISSN: 1359-6462
CoNE: https://pure.mpg.de/cone/journals/resource/954926243506