Fatigue strength and fracture mechanism of steel modified by super-rapid induction heating and quenching |
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| Affiliation: | 1. Department of Mechanical Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan;2. NETSUREN Co. Ltd. 5893, Tamura, Hiratsuka 254, Japan;1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Materials Science & Engineering Research Center, Beijing Jiaotong University, Beijing 100044, China;3. Beijing Iron & Steel Research Institute, Special Steel Institute, Beijing 100081, China;4. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas, El Paso 500 W. University Avenue, El Paso, TX 79968-0520, USA;1. College of Material Science and Technology, Shandong University of Science and Technology, Qingdao 266510, China;2. The Project National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China;1. Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing, Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Ibaraki 319-1195, Japan;2. Research and Development Headquarters, Neturen Co. Ltd, 7-4-10, Tamura, Hiratsuka, Kanagawa 254-0013, Japan;3. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono Ibaraki, Tsukuba 305-0047, Japan |
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| Abstract: | Four kinds of surface hardened-specimens (ordinary structural steel with carbon content of 0.45% C) having hardened thicknesses of 0.7–1.8 mm were prepared using a ‘super-rapid induction heating (SRIH) system’. Rotation bending fatigue tests were performed with special focus on the effect of a hardened thickness on fatigue properties. Measurement of residual stress and observation of the fracture surface were also carried out to investigate the fracture mechanism of the specimen with a shallow hardened layer. It was found that there is not much improvement of fatigue strength at 107 cycles for specimens with shallow hardened layers in spite of having a high compressive residual stress of about 1000 MPa. This is because the fatigue crack originating from inside the hardened layer leads to the final fracture of the specimen (internal fracture mode). Improvement of fatigue strength has been achieved on the specimen with thick hardened layers, such as those about 1.8 mm thick. In this case, fatigue cracks originate from inclusions located in hardened layers, which leads to final fracture (hardened-layer fracture mode). |
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