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  Study of Bauschinger effect of acicular ferrite and polygonal ferrite through ex-situ interrupted bending tests in API X80 linepipe steels

Kim, D. W., Sohn, S. S., Kim, W.-K., Kim, K.-S., & Lee, S. (2018). Study of Bauschinger effect of acicular ferrite and polygonal ferrite through ex-situ interrupted bending tests in API X80 linepipe steels. Scientific Reports, 8(1): 15598. doi:10.1038/s41598-018-34046-x.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-755F-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-7560-E
Genre: Journal Article

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Kim, Dae Woong1, Author              
Sohn, Seok Su2, Author              
Kim, Wan-Keun3, Author              
Kim, Ki-Seok4, Author              
Lee, Sunghak5, Author              
Affiliations:
1Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, South Korea, ou_persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3POSCO Computational Optimization of API steels Project Team, Technical Research Laboratories, POSCO, Kwangyang, 545-875, South Korea, ou_persistent22              
4Structural Research Group, Steel Solution Marketing Department, POSCO, Incheon, 406-840, South Korea, ou_persistent22              
5Center for Advanced Aerospace MaterialsPohang, University of Science and Technology, Pohang, South Korea, ou_persistent22              

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 Abstract: Linepipe steels complexly consisted of low-temperature transformation microstructures of bainitic ferrite, granular bainite, and acicular ferrite (AF) as well as polygonal ferrite (PF) which individually affect the Bauschinger effect occurring during the pipe-forming. In this study, microscopic analyses of electron back-scattered diffraction (EBSD) coupled with tension-compression and interrupted bending tests were performed for verification of the Bauschinger effect of AF and PF working as major microstructures in single-phase- and two-phase-rolled API X80 steels, respectively. With respect to microstructural effects on Bauschinger effect, the reduction in mobile dislocation density during the flattening was smaller in the AF than in the PF. However, the dislocation pile-up at low-angle substructures and high-angle grain boundaries was more frequently observed, thereby leading to the higher back stress and Bauschinger effect in the AF. Boundary kernel average misorientation (KAM) profile played a critical role in determining the Bauschinger effect because they were closely related with the back stress. Thus, the Bauschinger effect was higher in the single-phase-rolled steel than in the two-phase-rolled steel. The present ex-situ interrupted bending methods coupled with EBSD analyses are outstanding ones for the detailed explanation of Bauschinger effect and provide an important idea for the yield strength designs of linepipe steels. © 2018, The Author(s).

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Language(s): eng - English
 Dates: 2018-12-01
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41598-018-34046-x
BibTex Citekey: Kim2018
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 8 (1) Sequence Number: 15598 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322