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  Effects of microstructure on tensile, charpy impact, and crack tip opening displacement properties of two API X80 pipeline steels

Shin, S. Y. (2013). Effects of microstructure on tensile, charpy impact, and crack tip opening displacement properties of two API X80 pipeline steels. Metallurgical and Materials Transactions A, 44(6), 2613-2624. doi:10.1007/s11661-013-1613-2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D839-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D83A-B
Genre: Journal Article

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 Creators:
Shin, Sang Yong1, Author              
Affiliations:
1Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Api x80 pipeline steels; Crack tip opening displacement; Elongated grains; Granular bainites; High stress concentration; High-tensile strength; Rolling direction; Secondary phasis, Crack propagation; Crystal microstructure; Grain size and shape; Martensite; Mechanical properties; Steel pipe; Stress concentration; Tensile strength, Cracks
 Abstract: The effects of microstructure on tensile, Charpy impact, and crack tip opening displacement (CTOD) properties of two API X80 pipeline steels were investigated in this study. Two API X80 pipeline steels consisting of acicular ferrite and granular bainite, and a small amount of hard phases such as martensite and secondary phases have elongated grains along the rolling direction, so that they show different mechanical properties as the specimens' directions change. The 90 deg specimens have high tensile strength due to the low stress concentration on the fine hard phases and the high loads for the deformation of the elongated grains. In contrast, the 30 deg specimens have less elongated grains and larger hard phases such as martensite, with the size of about 3 μm, than the 90 deg specimens. Hence, the 30 deg specimens have low tensile strength because of the high stress concentration on the large hard phases and the low loads to deform grains. In the 90 deg specimen, brittle crack propagation surfaces are even since cracks propagate in a straight line along the elongated grain structure. In the 30 deg specimen, however, brittle crack propagation surfaces are uneven, and secondary cracks are observed, because of the zigzag brittle crack propagation path. In the CTOD properties, the 90 deg specimens have maximum forces of higher magnitude than the 30 deg specimens, because of the elongated grain structure. However, CTODs of the 90 deg specimens are lower than those of the 30 deg specimens because of the low plastic deformation areas by the elongated grains in the 90 deg specimens. © 2013 The Minerals, Metals Materials Society and ASM International.

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Language(s): eng - English
 Dates: 2013-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s11661-013-1613-2
BibTex Citekey: Shin20132613
 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
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Publ. Info: New York, NY : Springer Sciences & Business Media
Pages: - Volume / Issue: 44 (6) Sequence Number: - Start / End Page: 2613 - 2624 Identifier: ISSN: 1073-5623
CoNE: https://pure.mpg.de/cone/journals/resource/954928569608