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  Warm ductility enhanced by austenite reversion in ultrafine-grained duplex steel

Cheng, G.-J., Gault, B., Huang, C.-Y., Huang, C.-Y., & Yen, H.-W. (2018). Warm ductility enhanced by austenite reversion in ultrafine-grained duplex steel. Acta Materialia, 148, 344-354. doi:10.1016/j.actamat.2018.01.060.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E6CD-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E6CE-4
Genre: Journal Article

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 Creators:
Cheng, Guan-Ju1, Author              
Gault, Baptiste2, Author              
Huang, Cheng-Yao1, Author              
Huang, Ching-Yuan3, Author              
Yen, Hung-Wei1, Author              
Affiliations:
1Department of Materials Science and Engineering, National Taiwan University, Roosevelt Road, Taipei, Taiwan, persistent22              
2Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
3Iron and Steel R&D Department, China Steel Corporation, Chung Kang Road, Kaohsiung, Taiwan, persistent22              

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Free keywords: Austenite; Cold rolling; Deformation; Diffraction; Ductility; High resolution transmission electron microscopy; Manganese; Metal cladding; Microstructure; Steel; Transmission electron microscopy, Austenite reversion; Electron back-scattered diffraction; Equi-axed grains; Total elongations; Transformation; Ultra fine grain; Ultra-fine-grained; Warm deformation, Steel metallurgy
 Abstract: The current work investigated the relationship between microstructure and warm deformation properties in a strong but ductile Mn-rich steel. A cold-rolled Fe-11.3Mn-0.068C-0.3Si-1.1Al-0.25Mo-0.01P-0.01S-0.0003N (in wt. ) steel was deformed isothermally after inter-critical annealing at temperatures from 550 °C to 720 °C. Deformation at 650 °C led to exceptional ductility, corresponding to total elongation of over 100. The microstructure was characterized by electron backscattered diffraction, transmission Kikuchi diffraction, and transmission electron microscopy. It was found that the rate of austenite reversion can be accelerated by deformation, and that the transformation makes strained austenite into equiaxed grains. Exceptional ductility can be achieved when warm deformation is accompanied by austenite reversion. This research will provide metallurgical principles for warm deformation of steel under reversed transformation. © 2018 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2018-04-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.actamat.2018.01.060
BibTex Citekey: Cheng2018344
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 148 Sequence Number: - Start / End Page: 344 - 354 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100