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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This work was supported by Funding of National Natural Science Foundation of China (Grant No. 51405208), the China Postdoctoral Science Foundation Funded Project (Grant No. 2016M601753), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 16KJB460007), the Open Research Fund of Provincial Key Laboratory of Advanced Welding Technology of Jiangsu University of Science and Technology (Grant No. JSAWT-14-03), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Wu, M., Liu, F., Pu, J. et al. The Microstructure and Pitting Resistance of Weld Joints of 2205 Duplex Stainless Steel. J. of Materi Eng and Perform 26, 5341–5347 (2017). https://doi.org/10.1007/s11665-017-2976-0
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DOI: https://doi.org/10.1007/s11665-017-2976-0