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http://dx.doi.org/10.3365/KJMM.2010.48.10.875

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

Sung, Hyo Kyung (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
Shin, Sang Yong (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
Cha, Wooyeol (Steelmaking Research Group, Technical Research Laboratories, POSCO)
Oh, Kyungshik (Steelmaking Research Group, Technical Research Laboratories, POSCO)
Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
Kim, Nack J. (Graduate Institute of Ferrous Technology, Pohang University of Science and Technology)
Publication Information
Korean Journal of Metals and Materials / v.48, no.10, 2010 , pp. 875-883 More about this Journal
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 $O_2$ to form complex oxides and their microstructures and Charpy impact properties were investigated. 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;
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Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 2
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1 K. S. Bang, C. Park, H. C. Jung, and J. B. Lee, Met. Mater. Int. 15, 471 (2009).   DOI   ScienceOn
2 R. Denys, Pipeline Technology, Vol.I, p. 1, Elsevier, Amsterdam, Netherland (2000).
3 S. A. Dye, Metal Construction and British Welding Journal 2, 111 (1970).
4 K. T. Corbett, R. R. Bowen, and C. W. Petersen, Intern. J. of Offshore and Polar Engineering 14, 75 (2004).
5 J. Y. Koo, M. J. Luton, N. V. Bangaru, R. A. Petkovic, D. P. Fairchild, C. W. Petersen, H. Asahi, T. Hara, Y. Terada, M. Sugiyama, H. Tamehiro, Y. Komizo, S. Okaguchi, M. Hamada, A. Yamamoto, and I. Takeuchi, Proc. of The Thirteenth Intern. Offshore and Polar Engineering Conf., p.10, Honolulu, Hawaii, USA (2003).
6 D. P. Fairchild, M. L. Macia, S. D. Papka, C. W. Petersen, J. H. Stevens, S. T. Barbas, N. V. Bangaru, J. Y. Koo, and M. J. Luton, Proc. Intern. Pipe Dreamer's Conf., p. 307, Yokohama, Japan (2002).
7 J. Takamura and S. Mizoguchi, Proc. 6th Int. Iron Steel Congr., p. 591, ISIJ, Nagoya, Japan (1990).
8 S. Mizoguchi and J. Takamura, Proc. 6th Int. Iron Steel Congr., p. 598, ISIJ, Nagoya, Japan (1990).
9 T. Sawai, M. Wakoh, Y. Ueshima, and S. Mizoguchi, Proc. 6th Int. Iron Steel Congr., p. 605, ISIJ, Nagoya, Japan (1990).
10 S. Ogibayashi, K. Yamaguchi, M. Hirai, H. Goto, H. Yamaguchi, and K. Tanaka, Proc. 6th Int. Iron Steel Congr., p.612, ISIJ, Nagoya, Japan (1990).
11 T. Maki, Mater. Jpn. 36, 937 (1997).   DOI
12 J. M. Gregg and H. K. D. K. Bhadeshia, Acta Mater. 45, 739 (1997).   DOI   ScienceOn
13 M. Enomoto, Metals and Materials 4, 115 (1998).   DOI
14 F. J. Barbaro, P. Krauklis, and K. E. Easterling, Mat. Sci. Tech. 5, 1057 (1989).   DOI
15 S. Y. Shin, K. Oh, and S. Lee, J. Kor. Inst. Met. & Mater. 47, 59 (2009).
16 I. Tamura, H. Sekine, T. Tanaka, and C. Ouchi, Thermomechanical Processing of High-strength Low-alloy Steels, p. 80, Butterworth & Co. Ltd., London, UK (1988).
17 ASTM Standard E23-09, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials, p. 1, ASTM, West Conshohocken, USA (2009).
18 G. Krauss and S. W. Thompson, ISIJ 35, 937 (1995).   DOI   ScienceOn
19 C. H. Lee, H. K. D. H. Bhadeshia, and H.-C. Lee, Mater. Sci. Eng. A 360, 249 (2003).   DOI   ScienceOn
20 M. Diaz-Freuntes, A. Iza-Mendia, and I. Gutierrez, Metall. Mater. Trans. A 34, 2505 (2003).   DOI   ScienceOn
21 B. W. Choi, D. H. Seo, and J. I. Jang, Met. Mater. Int. 15, 373 (2009).   DOI   ScienceOn
22 H. K. D. H. Bhadeshia, Bainite in Steels, IOM Communications Ltd. (2001).