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Correlation of microstructure and fracture properties of API X70 pipeline steels

Title
Correlation of microstructure and fracture properties of API X70 pipeline steels
Authors
Hwang, BKim, YMLee, SKim, NJAhn, SS
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
MINERALS METALS MATERIALS SOC
Abstract
Effects of microstructure on fracture toughness and transition temperature of high-toughness X70 pipeline steels were investigated in this study. Three types of steels were fabricated by varying alloying elements such as C, Cu, and Mo, and their microstructures were varied by rolling conditions such as finish rolling temperature and finish cooling temperature. Charpy V-notch (CVN) impact tests and pressed notch drop-weight tear tests (DWTT) were conducted on the rolled steel specimens. The Charpy impact test results indicated that the specimens rolled in the single-phase region of the steel containing a reduced amount of C and Mo had the highest upper shelf energy (USE) and the lowest energy transition temperature (ETT) because of the appropriate formation of acicular, quasipolygonal, or polygonal ferrite and the decreased fraction of martensite-austenite constituents. Most of the specimens rolled in the single-phase region also showed excellent DWTT properties as the percent shear area (pct SA) well exceeded 85 pct, irrespective of finish cooling temperatures, while their USE was higher than that of the specimens rolled in the two-phase region. Thus, overall fracture properties of the specimens rolled in the single-phase region were better than those of the specimens rolled in the two-phase' region, considering both USE and pet SA.
URI
http://oasis.postech.ac.kr/handle/2014.oak/24728
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 3A, page. 725 - 739, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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