The Microstructure and Pitting Resistance of Weld Joints of 2205 Duplex Stainless Steel |
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| Authors: | Mingfang Wu Fei Liu Juan Pu Neil E Anderson Leijun Li Dashuang Liu |
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| Affiliation: | 1.Provincial Key Laboratory of Advanced Welding Technology,Jiangsu University of Science and Technology,Zhenjiang,China;2.Zhenjiang Technician Institute,Zhenjiang,China;3.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,Canada |
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| Abstract: | 2205 duplex stainless steel (DSS) was welded by submerged arc welding. The effects of both heat input and groove type on the ferrite/austenite ratio and elemental diffusion of weld joints were investigated. The relationships among welding joint preparation, ferrite/austenite ratio, elemental diffusion, and pitting corrosion resistance of weld joints were analyzed. When the Ni content of the weld wire deposit was at minimum 2–4% higher than that of 2205 DSS base metal, the desired ratio of ferrite/austenite and elemental partitioning between the austenite and ferrite phases were obtained. While the pitting sensitivity of weld metal was higher than that of base metal, the self-healing capability of the passive film of weld metal was better than that of the base metal when a single V-type groove was used. Furthermore, the heat input should be carefully controlled since pitting corrosion occurred readily in the coarse-grained heat-affected zone near the fusion line of welded joints. |
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