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Charpy Impact Properties of Heat Affected Zones of API X80 Linepipe Steels Containing Complex Oxides

Title
Charpy Impact Properties of Heat Affected Zones of API X80 Linepipe Steels Containing Complex Oxides
Authors
Sung, HKShin, SYCha, WOh, KLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Oct-2010
Publisher
KOREAN INST METALS MATERIALS
Abstract
This study assessed the Charpy impact properties of the heat affected zones (HAZs) of API X80 linepipe steels containing complex oxides Three types of steel were fabricated by adding Mg and O to form complex oxides and their microstructures and Charpy impact properties were mvestigated The number of complex oxides increased with the amount of excess Mg and O(2) that was included in the steels Simulated HAZs containing a number of oxides showed a high volume fraction of acicular ferrite (AF) because the oxides acted as nucleation sites for AF, thereby leading to an improvement in the Charpy impact properties According to a correlation study between the heat input, the volume fraction of the AF, and the Charpy impact properties, ductile fractures occurred predominantly when the fraction of the AF was 20% or higher, moreover, the Charpy absorbed energy was excellent at more than 100 J These findings suggest that the improvement of the Charpy impact properties of the HAZs was associated with the active nucleation of AF in the oxide containing steel HAZs
Keywords
metals welding; toughness impact test heat affected zone; ACICULAR FERRITE; MECHANICAL-PROPERTIES; CARBON STEELS; MICROSTRUCTURES; NUCLEATION
URI
http://oasis.postech.ac.kr/handle/2014.oak/25273
DOI
10.3365/KJMM.2010.48.10.875
ISSN
1738-8228
Article Type
Article
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, vol. 48, no. 10, page. 875 - 883, 2010-10
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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