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  Fabrication of bimodal-grained Al-free medium Mn steel by double intercritical annealing and its tensile properties

Han, J., Kang, S.-H., Lee, S.-J., & Lee, Y.-K. (2016). Fabrication of bimodal-grained Al-free medium Mn steel by double intercritical annealing and its tensile properties. Journal of Alloys and Compounds, 681, 580-588. doi:10.1016/j.jallcom.2016.04.014.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B232-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B233-C
Genre: Journal Article

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 Creators:
Han, Jeongho1, 2, Author              
Kang, Seok-Hyeon3, Author              
Lee, Seung-Joon4, Author              
Lee, Young-Kook5, Author              
Affiliations:
1Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
2Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea, persistent22              
3Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea, persistent22              
4Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea, persistent22              
5Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Republic of Korea, persistent22              

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Free keywords: Aluminum; Cold rolling; Ferrite; Grain boundaries; Manganese; Martensite; Martensitic steel; Mechanical properties; Metal cladding; Metallurgy; Microstructure; Phase transitions; Steel sheet, Chemical concentrations; Discontinuous yielding; Dual phase microstructure; Intercritical annealing; Metals and alloys; Reverse Transformation; Thermomechanical process; Yield point elongations, Annealing
 Abstract: The objectives of the present study were to develop the bimodal-grained microstructure in a medium Mn steel without the addition of Al only through a thermo-mechanical process, and to systematically investigate the relationship between the bimodal-grained microstructure and yielding behavior. The cold-rolled Fe-7Mn-0.05C (wt.) steel with deformed α′ martensite was annealed twice with different temperatures and holding times. When the cold-rolled specimens were first-annealed at 660 °C for 4 h-22 h, the specimens showed a dual-phase microstructure consisting of globular-shaped ferrite (αG) and thermally induced α′ martensite at room temperature. Whereas the sizes of both αG grains and α′ martensite constituents increased with increasing the first annealing time, both the volume fraction and the chemical concentration of each phase were insignificantly changed. When the first-annealed specimens were annealed again at 640 °C for 5 min, the specimens exhibited bimodal-grained structures with coarse αG and ultrafine lath-shaped ferrite (αL) and retained austenite (γL). The coarse αG came from αG pre-existing in the first-annealed specimen; the fine αL and γL formed by the α′ martensite to γ diffusive reverse transformation. The second-annealed specimens exhibited a transition of yielding behavior from discontinuous yielding with yield-point elongation (YEL) to continuous yielding without YEL due to the coarsening of αG grains with increasing the first annealing time up to 22 h. © 2016 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2016-10-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.jallcom.2016.04.014
BibTex Citekey: Han2016580
 Degree: -

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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 681 Sequence Number: - Start / End Page: 580 - 588 Identifier: ISSN: 0925-8388
CoNE: /journals/resource/954925567746