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Effective grain size and charpy impact properties of high-toughness X70 pipeline steels

Title
Effective grain size and charpy impact properties of high-toughness X70 pipeline steels
Authors
Hwang, BKim, YGLee, SKim, YMKim, NJYoo, JY
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
MINERALS METALS MATERIALS SOC
Abstract
The correlation of microstructure and Charpy V-notch (CVN) impact properties of a high-toughness API X70 pipeline steel was investigated in this study. Six kinds of steel were fabricated by varying the hot-rolling conditions, and their microstructures, effective grain sizes, and CVN impact properties were analyzed. The CVN impact test results indicated that the steels rolled in the single-phase region had higher upper-shelf energies (USES) and lower energy-transition temperatures (ETTs) than the steels rolled in the two-phase region because their microstructures were composed of acicular ferrite (AF) and fine polygonal ferrite (PF). The decreased ETT in the steels rolled in the single-phase region could be explained by the decrease in the overall effective grain size due to the presence of AF having a smaller effective grain size. On the other hand, the absorbed energy of the steels rolled in the two-phase region was considerably lower because a large amount of dislocations were generated inside PFs during rolling. It was further decreased when coarse martensite or cementite was formed during the cooling process.
URI
http://oasis.postech.ac.kr/handle/2014.oak/24464
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 8, page. 2107 - 2114, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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