Fatigue performance of friction stir welded marine grade steel |
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| Affiliation: | 1. Department of Psychiatry, University of California, San Diego, La Jolla, CA;2. Department of Neurosciences, University of California, San Diego, La Jolla, CA;3. Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla, CA;1. Department of Electromechanical Engineering, University of Macau, Macau, China;2. Institute for the Development and Quality, Macau, China;3. Institute of Applied Physics and Materials Engineering, University of Macau, Macau, China;4. Aerospace Engineering Equipment (Suzhou) Co. Ltd, Suzhou, China;5. Institute of Advanced Materials & Technology, University of Science and Technology Beijing, Beijing, China;6. BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Graduate School of University of Science and Technology Beijing, Foshan, China;1. Department of Electromechanical Engineering, University of Macau, China;2. Institute of Applied Physics and Materials Engineering, University of Macau, China;3. School of Materials Science and Engineering, University of New South Wales, Sydney, Australia |
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| Abstract: | An extensive study on the fatigue performance of friction stir welded DH36 steel was carried out. The main focus of this experimental testing programme was fatigue testing accompanied by tensile tests, geometry measurements, hardness and residual stress measurements, and fracture surface examination. The S–N curve for friction stir butt welded joints was generated and compared with the International Institute of Welding recommendations for conventional fusion butt welds. Friction stir welds of marine grade steel exceeded the relevant rules for fusion welding. This newly developed S–N curve is being proposed for use in the relevant fatigue assessment guidelines for friction stir welding of low alloy steel. Fracture surfaces were examined to investigate the fatigue failure mechanism, which was found to be affected by the processing features generated by the friction stir welding tool. |
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| Keywords: | Friction stir welding Low alloy steel Fatigue testing Residual stresses Fracture surface analysis |
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