Effects of internal hydrogen and surface-absorbed hydrogen on the hydrogen embrittlement of X80 pipeline steel |
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| Affiliation: | 1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;3. Hefei General Machinery Research Institute, Hefei 230031, China;1. Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan;2. Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan;3. Department of Mechanical Sciences and Engineering, Chiba Institute of Technology, 2-17-1 Tsudamuma, Narashino, Chiba 275-0016, Japan;1. State Key Laboratory of Fluid Power and Mechatronic Systems, Hangzhou, Zhejiang, 310027, PR China;2. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang, 310027, PR China;3. Engineering Research Center for High Pressure Process Equipment and Safety of Ministry of Education, Hangzhou, Zhejiang, 310027, PR China;4. Institute of Material Forming and Control Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, PR China;1. Department of Mechanical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan;2. Leibniz Universität Hannover, Institut für Werkstoffkunde (Materials Science), An der Universität 2, 30823 Garbsen, Germany;3. Department of Mechanical Engineering, Abdullah Gül University, 38039 Kayseri, Turkey;1. Department of Engineering Design and Materials, NTNU, 7456 Trondheim, Norway;2. SINTEF Materials and Chemistry, 7456 Trondheim, Norway;1. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, 266500, China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada;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: | Effects of internal hydrogen and surface-absorbed hydrogen on hydrogen embrittlement (HE) of X80 pipeline steel were investigated by using different strain rate tensile test, annealing and hydrogen permeation tests. HE of X80 pipeline steel is affected by internal hydrogen and surface-absorbed hydrogen, and the latter plays a major role due to its higher effective hydrogen concentration. The HE susceptibility decreases with increasing the strain rate because it is more difficult for hydrogen to be captured by dislocations at the high strain rate. Annealing at 200 °C can weakened HE caused by internal hydrogen, while it has little effect on HE caused by surface-absorbed hydrogen. HE of X80 pipeline steel is mainly determined by the behavior of dislocation trapping hydrogen, which can be attributed to the interaction between hydrogen and dislocation. |
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| Keywords: | Carbon steel Hydrogen embrittlement Internal hydrogen Surface-absorbed hydrogen Hydrogen permeation |
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