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Effects of acicular ferrite on charpy impact properties in heat affected zones of oxide-containing API X80 linepipe steels

Title
Effects of acicular ferrite on charpy impact properties in heat affected zones of oxide-containing API X80 linepipe steels
Authors
Sung, HKShin, SYCha, WOh, KLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Apr-2011
Publisher
ELSEVIER SCIENCE SA
Abstract
This study was concerned with effects of acicular ferrite on Charpy impact properties in heat affected zones (HAZs) of two API X80 linepipe steels containing oxides. In the one steel, Mg and O-2 were additionally added to form a larger amount of oxides than the other steel, which was a conventional X80 steel containing a considerable amount of Al and Ti. Various HAZ microstructures were obtained by conducting HAZ simulation tests under different heat inputs of 35 kJ cm(-1) and 60 kJ cm(-1). Oxides present in the API X80 linepipe steels were complex oxides whose average size was 1-2 mu m, and the number of oxides increased with increasing amount of Mg and O-2. The volume fraction of acicular ferrite present in the steel HAZs increased with increasing number of oxides, and decreased with increasing heat input. When the volume fraction of acicular in the HAZ was higher than 20%, Charpy impact energy at -20 degrees C was higher than 100 J as the ductile fracture mode was dominant. Particularly in the steel HAZs having a larger amount of oxides, Charpy impact properties were excellent because oxides worked as nucleation sites of acicular ferrite during welding. Charpy impact properties of the HAZs could be well correlated with the volume fraction of acicular ferrite and number of oxides under different heat input conditions. (C) 2011 Elsevier B.V. All rights reserved.
Keywords
API X80 linepipe steel; Heat affected zone; Complex oxides; Charpy impact properties; CARBON STEELS; RECRYSTALLIZATION; MICROSTRUCTURES; BEHAVIOR
URI
http://oasis.postech.ac.kr/handle/2014.oak/17549
DOI
10.1016/J.MSEA.2011.01.031
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 528, no. 9, page. 3350 - 3357, 2011-04
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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