Changes in magnetic field intensities around fatigue crack tips of medium carbon low alloy steel (S45C,JIS) |
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| Affiliation: | 1. Department of Mechanical Engineering, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;2. Fundamental Studies on Technologies for Steel Materials with Enhanced Strength and Functions, Consortium of the JRCM, Nishi-shinbashi, 1-5-11, Minato-ku, Tokyo 105-0003, Japan;3. Department of Mechanical and Intellectual Systems Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan;1. Department of Food Science and Biotechnology, Kyungnam University, 7 Kyungnamdaehak-ro, Masanhappo-gu, Changwon 51767, South Korea;2. SCHN Technology Inc., #4-205 Gyeongnam-Technopark Building, 21 Bongambuk 7-gil, Masanhoiwon-gu, Changwon 51347, South Korea;1. US Army RDECOM CERDEC Command, Power & Integration Directorate, United States;2. The Catholic University of America, Department of Mechanical Engineering, United States;1. ICB, UMR 6303 CNRS—Université Bourgogne Franche-Comté, BP 47870, 21078 Dijon Cedex, France;2. Manufacture des pneumatiques MICHELIN, BP 63040 Clermont-Ferrand Cedex 9, France;3. AGH University of Science and Technology, Ul. Reymonta 23, 30-059 Krakow, Poland;1. College of Material Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;3. School of Material Science and Engineering, Nanchang Hangkong University, 696 Fenghenan Avenue, Nanchang, 330063, China |
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| Abstract: | Damage of machine components occur when cracks form and continue to grow to a size large enough to cause fracture. In order to understand the crack propagation phenomena, non-destructive evaluation methods that can be correlated to measurements around the fatigue crack tips are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped with a three-dimensional sensor and observed magnetic fields around fatigue cracks at room temperature in air while they were growing. In order to study the relation between plastic deformations and magnetic flux densities, both as-received non-heat-treated and heat-treated (quenched and tempered) specimens were used. Medium carbon low alloy steel specimens (S45C, JIS) were used in the experiments. The area around the crack tip was magnetized and the changes in the area were observed. The changes in magnetic fields in soft and hard specimens with the same intensity factors were compared. A strong correlation between the changes in the magnet fields and plastic deformation areas was found. |
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| Keywords: | Magnetic field Crack growth Stress intensity factor Plastic deformation Scanning Hall probe microscopy Medium carbon low alloy steel |
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