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  Effects of Start and Finish Cooling Temperatures on the Yield Strength and Uniform Elongation of Strain-Based API X100 Pipeline Steels

Lee, D. H., Sohn, S. S., Song, H., Ro, Y., Lee, C. S., Lee, S., et al. (2018). Effects of Start and Finish Cooling Temperatures on the Yield Strength and Uniform Elongation of Strain-Based API X100 Pipeline Steels. Metallurgical and Materials Transactions A, 49(10), 4536-4543. doi:10.1007/s11661-018-4738-5.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E791-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-8819-9
Genre: Journal Article


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Lee, Dong Ho1, Author              
Sohn, Seok Su2, Author              
Song, Hyejin3, Author              
Ro, Yunjo4, Author              
Lee, Chang Sun1, Author              
Lee, Sunghak5, Author              
Hwang, Byoungchul6, Author              
1Technical Research Laboratories, Gwangyang, South Korea, ou_persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea, ou_persistent22              
4SK Innovation, Daejeon, South Korea, ou_persistent22              
5Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea, ou_persistent22              
6Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul, 139-743, Republic of Korea, ou_persistent22              


Free keywords: Austenite; Bainite; Cooling; Fabrication; Ferrite; Heat resistance; Heat treatment; Pipelines; Steel pipe; Yield stress, After-heat treatment; Cooling temperature; Degree of supercooling; Effect of the microstructures; Finish cooling temperatures; Mobile dislocations; Polygonal ferrites; Uniform elongation, Elongation
 Abstract: Three types of strain-based API X100 pipeline steels composed of polygonal ferrite (PF), acicular ferrite (AF), granular bainite (GB), bainitic ferrite (BF), and martensite–austenite (MA) were fabricated by varying the start cooling temperature (SCT) and finish cooling temperature (FCT). The effect of the microstructure on the yield strength and uniform elongation before and after strain aging was investigated. In the H-H steel fabricated at a high SCT and low FCT, the reduction in uniform elongation after prestraining was small, but the uniform elongation after heat treatment increased because of the presence of many mobile dislocations around AF and GB, which are present in a relatively high fraction. Because the H-L steel fabricated at high SCT and low FCT has a considerable amount of BF as a result of the significant degree of supercooling, carbon atoms were readily trapped at dislocations inside the BF during heat treatment, which reduced the resistance to strain aging. On the other hand, the L-L steel had a large amount of soft PF transformed in the two-phase (austenite + ferrite) region and high fractions of AF and MA because it was fabricated at low SCT and low FCT. As a result, the uniform elongation of the L-L steel was slightly increased after heat treatment because mobile dislocations were readily generated around the PF and MA boundaries under deformation. © 2018 The Minerals, Metals Materials Society and ASM International


Language(s): eng - English
 Dates: 2018-06-262018-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11661-018-4738-5
BibTex Citekey: Lee20181
 Degree: -



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Title: Metallurgical and Materials Transactions A
  Other : Metallurgical and Materials Transactions A, Physical Metallurgy and Materials Science
  Abbreviation : Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
Source Genre: Journal
Publ. Info: New York, NY : Springer Sciences & Business Media
Pages: - Volume / Issue: 49 (10) Sequence Number: - Start / End Page: 4536 - 4543 Identifier: ISSN: 1073-5623
CoNE: https://pure.mpg.de/cone/journals/resource/954928569608