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Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels

Title
Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels
Authors
Shin, SYHwang, BLee, SKim, NJAhn, SS
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2007
Publisher
ELSEVIER SCIENCE SA
Abstract
This study aims at correlating microstructure and Charpy impact properties in high-toughness API X70 and X80 line-pipe steels. Three kinds of steels were fabricated by varying alloying elements and hot rolling conditions, and their microstructures and Charpy impact proper-ties were investigated. In addition, their effective grain sizes were characterized by the electron back-scatter diffraction (EBSD) analysis. The Charpy impact test results indicated that the steels rolled in the single phase region had the higher upper shelf energy (USE) than the steel rolled in the two phase region because their microstructures were composed of acicular ferrites. In the X80 steel rolled in the single phase region, the decreased energy transition temperature (ETT) could be explained by the decrease in the overall effective grain size due to the presence of acicular ferrite having smaller effective grain size. Thus, it had excellent mechanical properties in yield and tensile strengths, absorbed energy, and transition temperature, except in ductility. (c) 2007 Elsevier B.V. All rights reserved.
Keywords
API X70 line-pipe steel; charpy impact test; energy transition temperature; effective grain size; LOW-CARBON; GRAIN-SIZE; FRACTURE; TOUGHNESS; BEHAVIOR; PREDICTION; PIPELINES
URI
http://oasis.postech.ac.kr/handle/2014.oak/29445
DOI
10.1016/J.MSEA.2006.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 458, no. 39815, page. 281 - 289, 2007-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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