The effect of baking time,fillet radius,and hardness on the lifecycles of pole fastening screws in an electric motor with hydrogen embrittlement |
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| Affiliation: | 1. Naval System Research Team, Busan Center, Defense Agency for Technology and Quality, 525-2, Gwangan 1 dong, Busan, Republic of Korea;2. Department of Mechanical Engineering, Pusan National University, Jangjeon-dong, Kumjung-ku, Busan, Republic of Korea;3. S&T Motiv, Co., Motor Development Team, Song-Jung Li 5, KijangKun, Busan, Republic of Korea;1. Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China;2. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China;1. Centre for Laser, Atomic and Molecular Sciences (CLAMS), Department of Physics, University of New Brunswick, 100 Tucker Park Road, Saint John, NB E2L 4L5, Canada;2. Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX 77710, USA;3. Department of Chemistry, The University of Akron, OH 44325, USA;4. Canadian Light Source Inc., University of Saskatchewan, 44 Innovation Blvd, Saskatoon, SK S7N 2V3, Canada;1. Institute of Physics of Materials, Academy of Science of the Czech Republic, Žižkova 22, 616 62 Brno, Czech Republic;2. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria;3. Institute of Mechanics, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria;1. European Commission, Joint Research Centre (JRC), Directorate for Energy Transport and Climate, Petten, The Netherlands;2. Univ. Grenoble Alpes, F-38000 Grenoble, France;3. CEA, LITEN, DTBH, F-38054, Grenoble, France;4. TenarisDalmine, Dalmine, Italy;5. Centro Sviluppo Materiali, S.P.A., Rome, Italy |
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| Abstract: | In order to protect bolts from corrosion, electroplating such as zinc plating is widely used. However, hydrogen can easily penetrate or diffuse into the vacancies and dislocations between the lattices of bolt steel during electroplating. As the diffused hydrogen defects inside the lattice are in gaseous form, small cracks can easily be produced due to high pressure from the hydrogen gas. In this research, in order to determine the root cause of the fracture in pole fastening screws resulting from hydrogen embrittlement in typical electric motors, additional factors that accelerate hydrogen embrittlement fracture were selectively applied, including a small fillet in the head–shank transition and excessive hardness, and parametric study was performed experimentally. |
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| Keywords: | Hydrogen embrittlement Fatigue Pole screw |
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