Influence of hydrogen on the microstructure and fracture toughness of friction stir welded plates of API 5L X80 pipeline steel |
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| Affiliation: | 1. State University of Ponta Grossa, UEPG, Ponta Grossa, PR, Brazil;2. Brazilian Nanotechnology National Laboratory, LNNano, Brazilian Center for Research in Energy and Materials, Campinas, SP, Brazil;3. Center for Engineering, Modeling and Applied Social Sciences (CECS), Universidade Federal do ABC (UFABC), Santo André, SP, Brazil;4. State University of Campinas, UNICAMP, Campinas, SP, Brazil;5. Metallurgical and Materials Engineering, University of São Paulo, USP, São Paulo, SP, Brazil;6. Petrobras, CENPES, Rio de Janeiro, RJ, Brazil;7. UNESP – São Paulo State University, São João da Boa Vista, SP, Brazil;1. Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada;2. EVRAZ Inc. NA, P.O. Box 1670, Regina, SK S4P 3C7, Canada;1. State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;2. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/gas Facility Materials, China University of Petroleum, Beijing 102249, China;3. Institute of Material Forming and Control Engineering, Zhejiang University of Technology, Hangzhou 310014, China;1. State Key Laboratory of Heavy Oil Processing, Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;2. Institute of Material Forming and Control Engineering, Zhejiang University of Technology, Hangzhou 310014, China;1. State Key Laboratory of Rolling and Automation, Northeastern University, No.3 Wenhua Road, Shenyang 110819, China;2. Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, TX 79968, USA;1. Department of Materials Science and Engineering, Tianjin University, Tianjin, 300354, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300354, China |
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| Abstract: | In this work, the influence of hydrogen on the microstructure and fracture toughness of API 5L X80 high strength pipeline steel welded by friction stir welding was assessed. Samples were hydrogenated at room temperature for a duration of 10 h in a solution of 0.1 M H2SO4 + 10 mg L?1 As2O3, with an intensity current of 20 mA cm?2. Fracture toughness tests were performed at 0 °C in single-edged notched bending samples, using the Critical Crack Tip Opening Displacement (CTOD) parameter. Notches were positioned in different regions within the joint, such as the stir zone, hard zone, and base material. Hydrogen induces internal stress between bainite packets and ferrite plates within bainite packets. Besides, hydrogen acted as a reducer of the strain capacity of the three zones. The base metal had a moderate capacity to resist stable crack growth, displaying a ductile fracture mechanism. While the hard zone showed a brittle behavior with CTOD values below the acceptance limits for pipeline design (0.1–0.2 mm). The fracture toughness of the stir zone is higher than that of the base metal. Nevertheless, the stir zone displayed higher data dispersion due to its high inhomogeneity. Hence, it can also show a brittle behavior with critical CTOD values. |
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| Keywords: | Friction stir welding ISO 3183 X80 M High strength steel Hydrogen embrittlement |
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