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Analysis of abnormal fracture occurring during drop-weight tear test of high-toughness line-pipe steel

Title
Analysis of abnormal fracture occurring during drop-weight tear test of high-toughness line-pipe steel
Authors
Hwang, BLee, SKim, YMKim, NJYoo, JYWoo, CS
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2004
Publisher
ELSEVIER SCIENCE SA
Abstract
In this study, various types of drop-weight tear test (DWTT) were conducted on a high-toughness line-pipe steel in order to analyze abnormal fracture appearance occurring in the region impacted by a hammer. A pressed notch or a chevron notch was introduced into DWTT specimens, some of which had a back slot designed to decrease the inverse fracture area. After the DWTT percent shear area, area of inverse fracture surface, and hardness and work hardening exponent of the hammer-impacted region were measured. The results indicated that the shear area of the pressed-notch DWTT specimens was larger than that of chevron-notch DWTT specimens. In the hammer-impacted region of all the DWTT specimens, abnormal inverse fracture having a cleavage fracture mode appeared, and its fracture area was correlated well with hardness and work hardening exponent measured by an indentation test. The formation of this inverse cleavage fracture raised the fracture propagation transition temperature (FPTT) by decreasing the shear area measured in accordance of the API 5L3 specification, which was confirmed by relating to the Charpy impact test data of pre-strained steel specimens. Thus, it was desirable to exclude the inverse fracture formed in the hammer-impacted region when calculating percent shear area of DWTT because compressive pre-strain induced by work hardening did not exist in actual applications of line-pipe steels. (C) 2003 Published by Elsevier B.V.
Keywords
high-toughness pipeline steel; abnormal fracture appearance; drop-weight tear test (DWTT); API 5L3 specification; acicular ferrite; TRANSITION-TEMPERATURE REGION; DEFORMATION; BEHAVIOR; ALLOY
URI
http://oasis.postech.ac.kr/handle/2014.oak/29752
DOI
10.1016/J.MSEA.2003.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 368, no. 1-2, page. 18 - 27, 2004-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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