Effects of Inclusions and Microstructures on Impact Energy of High Heat-Input Submerged-Arc-Weld Metals

[+] Author and Article Information
Beomjoo Kim, Changhee Lee

Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea

Sangho Uhm, Jongbong Lee, Youngho An

POSCO Technical Research Lab Welding Research Team, 1 Koedong-dong, Nam-gu, Pohang, Kyongsangbuk-do 790-600, Korea

J. Eng. Mater. Technol 127(2), 204-213 (Apr 06, 2005) (10 pages) doi:10.1115/1.1857933 History: Received June 18, 2003; Revised September 22, 2004; Online April 06, 2005
Copyright © 2005 by ASME
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Grahic Jump Location
The Charpy impact energy for L and Y welds at various test temperatures (solid and dotted line represent the trajectory)
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Fractography of impact test specimen of L (a), (b) 60 kJ/cm (0°C); (c), (d) 300 kJ/cm (20°C); (e), (f) 530 kJ/cm (20°C)
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Fractography of impact test specimen of Y (a), (b) 60 kJ/cm (0°C); (c), (d) 300 kJ/cm (20°C); (e), (f) 530 kJ/cm (20°C)
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Microstructures of L welds at various heat inputs (a), (b) 60 kJ/cm; (c), (d) 300 kJ/cm; (e), (f) 530 kJ/cm
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Microstructures of Y welds at various heat inputs (a), (b) 60 kJ/cm; (c), (d) 300 kJ/cm; (e), (f) 530 kJ/cm  
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Volume fraction of acicular ferrite and grain size of polygonal ferrite for wire-flux combinations and heat inputs
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General composition of inclusions
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Size distribution of inclusions in acicular ferrite region
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Average compositions of inclusions in atomic percent
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Contour of acicular ferrite fraction as a function of heat input and the number of inclusions in (a) L and (b) Y welds
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Plot of toughness as a function of heat input and the number of inclusions in (a) L and (b) Y specimen
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Elemental mapping analysis (a) SEM image, (b) EDS data, (c) Mapping data (X20,000)




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