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  Effects of microstructure and pre-strain on Bauschinger effect in API X70 and X80 linepipe steels

Sohn, S. S., Han, S. Y., Shin, S. Y., Bae, J., & Lee, S. (2013). Effects of microstructure and pre-strain on Bauschinger effect in API X70 and X80 linepipe steels. Metals and Materials International, 19(3), 423-431. doi:10.1007/s12540-013-3007-9.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D812-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D813-6
Genre: Journal Article

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 Creators:
Sohn, Seok Su1, Author              
Han, Seung Youb2, Author              
Shin, Sang Yong3, Author              
Bae, Jinho4, Author              
Lee, Sunghak5, Author              
Affiliations:
1Pohang University of Science and Technology, Pohang, South Korea, persistent22              
2Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Sheet Products and Process Research Group, Technical Research Laboratories, POSCO, Pohang 790-785, South Korea, persistent22              
5Center for Advanced Aerospace MaterialsPohang, University of Science and Technology, Pohang, South Korea, persistent22              

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 Abstract: In this study, effects of microstructure and pre-strain on the Bauschinger effect were investigated in two API X70 and two API X80 linepipe steel sheets fabricated by controlling the cooling condition, and their yield strength and Bauschinger parameters were measured by the tension-compression test with varying tension pre-strain. The fast-cooled steels had the higher fraction of acicular ferrite, granular bainite and martensite-austenite (MA) constituents and smaller grain sizes. The reduction in yield stress (ΔYS) of the steels having a higher fraction of MA and smaller grain sizes was higher than that of the steels having a lower fraction of MA and larger grain sizes. The ΔYS was smallest at the pre-strain of 1, reached the maximum at the pre-strain of 2, and then decreased with increasing pre-strain. This result could be explained by the amounts of mobile dislocations and back stress, which affected the Bauschinger effect and strain hardening effect simultaneously. Since these two effects affected the yield strength on a competing basis, the Bauschinger stress and hardening parameter were used to separately analyze these effects. It could be confirmed that the Bauschinger effect and strain hardening effect were activated at pre-strains of 1-2 and 3-4, respectively. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

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Language(s): eng - English
 Dates: 2013-05
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s12540-013-3007-9
BibTex Citekey: Sohn2013423
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Title: Metals and Materials International
Source Genre: Journal
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Pages: - Volume / Issue: 19 (3) Sequence Number: - Start / End Page: 423 - 431 Identifier: ISSN: 15989623
CoNE: /journals/resource/15989623