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A new non-destructive method for estimating the remanent life of a turbine rotor steel by reversible magnetic permeability
Institution:1. Division of Electromagnetic Metrology, Magnetics Laboratory, Korea Research Institute Standards and Science, P.O. Box 102 Yusong, 305-600 Taejon, South Korea;2. Division of Industrial Metrology, Korea Research Institute Standards and Science, Taejon 305-600, South Korea;3. Micro-Contamination Control Engineering Group/Samsung Electronics Co., Kyunggi-Do, 449-711, South Korea;4. Department of Physics, Hannam University, Taejon 300-791, South Korea;1. Institute of Joining and Assembly, Chemnitz University of Technology, 09126 Chemnitz, Germany;2. Insitute of Corrosion and Damage Analysis, 39124 Magdeburg, Germany;1. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;2. Guodian Science and Technology Research Institute, Beijing 102209, China;1. College of Electrical Engineering and Control Science, Nanjing Tech University, Nanjing, Jiangsu 211816, China;2. School of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China;3. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, China;1. Hungarian Academy of Sciences, Centre for Energy Research, Institute of Technical Physics and Materials Science, H-1121 Budapest, Konkoly Thege Miklos ut 29-33, Hungary;2. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;3. Institute of Physics ASCR, Na Slovance 2, Prague 18221, Czech Republic;4. Kusaka Rare Metal Co. Ltd., Hitotsumatsu Bidg.No. 3-15, Shiba Daimon 2-chome, Minato-ku, Tokyo, 05-0012, Japan
Abstract:We present a new magnetic and non-destructive procedure to evaluate the remanent life of 1Cr–1Mo–0.25V steel using the value of reversible magnetic permeability. The method is based on the existence of reversible magnetic permeability in the differential magnetization around the coercive force. The measurement principle is based on the foundation harmonics voltage induced in a coil using a lock-in amplifier tuned to a frequency of the exciting one. Results obtained for reversible magnetic permeability and Vickers hardness on the aged sample show that the peak interval of reversible magnetic permeability (PIRMP) and Vickers hardness decreases as aging time increases. A softening curve is obtained from the correlation between Vickers hardness and the PIRMP. This curve can be used as a non-destructive method to evaluate the remanent life of 1Cr–1Mo–0.25V steel.
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