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Effect of heat-input on pitting corrosion behavior of friction stir welded high nitrogen stainless steel
Affiliation:1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China;2. Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569, Stuttgart, Germany;3. Department of Physics, Shantou University, Shantou, 515063, China;1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian, 116024, China;2. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, China;3. Department of Orthopedics, The Second Hospital of Dalian Medical University, Dalian, 116024, China;1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Commercial Aircraft Engine Company Limited, Aero Engine Corporation of China, Shanghai, 200241, China;3. Key Laboratory of Near Net Forming of Jiangxi Province, Nanchang University, Nanchang, 330031, China;4. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240,;5. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kow-loon, Hong Kong, 999077, China;1. Department of Physics, and Shenzhen Institute of Research and Innovation (HKU-SIRI), The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, China;3. Guangdong Research Center for Interfacial Engineering of Functional Materials, and College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. University of Science & Technology of China, Hefei 230026, China;3. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;4. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;5. MagIC-Magnesium Innovation Centre, Helmholtz-Zentrum Geesthacht, Max-Planck Strasse 1, 21502, Geesthacht, Germany;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. Fraunhofer Institute for Industrial Mathematics, Fraunhofer-Platz 1, Kaiserslautern 67663, Germany;3. German Engineering Materials Science Centre, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany;4. Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85747 Garching, Germany
Abstract:In this study, different welding parameters were selected to investigate the effects of heat-input on the microstructure and corrosion resistance of the friction stir welded high nitrogen stainless steel joints. The results showed that, the welding speed had major influence on the duration at elevated temperature rather than the peak temperature. The hardness distribution and tensile properties of the nugget zones (NZs) for various joints were very similar while the pitting corrosion behavior of various NZs showed major differences. Large heat-input resulted in the ferrite bands being the pitting location, while tool wear bands were sensitive to pitting corrosion in the low heat-input joints. Cr diffusion and tool wear were the main reasons for pitting. The mechanisms of pitting corrosion in the NZs were analyzed in detail.
Keywords:High nitrogen stainless steel  Friction stir welding  Mechanical properties  Corrosion resistance  Heat-input
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