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Correlation of rolling condition, microstructure, and low-temperature toughness of X70 pipeline steels

Title
Correlation of rolling condition, microstructure, and low-temperature toughness of X70 pipeline steels
Authors
Hwang, BLee, SKim, YMKim, NJYoo, JY
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
MINERALS METALS MATERIALS SOC
Abstract
Correlation of rolling conditions, microstructure, and low-temperature toughness of high-toughness X70 pipeline steels was investigated in this study. Twelve kinds of steel specimens were fabricated by vacuum-induction melting and hot rolling, and their microstructures were varied by rolling conditions. Charpy V-notch (CVN) impact test and drop-weight tear test (DWTT) were conducted on the rolled steel specimens in order to analyze low-temperature fracture properties. Charpy impact test results indicated that the energy transition temperature (ETT) was below - 100 degrees C when the finish cooling temperature range was 350 degrees C to 500 degrees C, showing excellent low-temperature toughness. The ETT increased because of the formation of bainitic ferrite and martensite at low finish cooling temperatures and because of the increase in effective grain size due to the formation of coarse ferrites at high finish cooling temperatures. Most of the specimens also showed excellent DWTT properties as the percent shear area well exceeded 85 pet, irrespective of finish rolling temperatures or finish cooling temperatures, although a large amount of inverse fracture occurred at some finish cooling temperatures.
URI
http://oasis.postech.ac.kr/handle/2014.oak/24531
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 7, page. 1793 - 1805, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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