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http://dx.doi.org/10.3795/KSME-A.2002.26.7.1262

Evaluation of 1Cr-1Mo-0.25V Steel Degradation Using Magnetic Barkhausen Noise  

Lee, Jong-Min (인하대학교 기계공학부)
Ahn, Bong-Young (한국표준과학연구원)
Nahm, Seung-Hoon (한국표준과학연구원)
Lee, Seung-Seok (한국표준과학연구원)
Lee, Ouk-Sub (인하대학교 기계공학부)
Nam, Young-Hyun (한국표준과학연구원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.26, no.7, 2002 , pp. 1262-1269 More about this Journal
Abstract
It is inevitable to evaluate the life of turbine rotor because the operating periods of power plants need to be extended. For the test, seven kinds of specimens with different degradation levels were prepared by the isothermal heat treatment at $630^{\circ}C$. Magnetic methods utilizing Barkhausen noise coercive force($BN_c$) were applied to detect the degradation caused by thermal aging. Magnetic property of material is related with domain dynamics and that is affected by the microstructure of material. Therefore $BN_c$ is very sensitive to the microstructure change of the material. With the increase of degradation, $BN_c$ was decreased and this phenomenon is considered due to precipitations and grain size. The result was compared with Vickers hardness($H_v$) and coercive force($H_c$) to detect the relative variation, and was related with $H_v$ and YS to estimate the change of the mechanical properties with the degradation.
Keywords
1Cr-1Mo Steel; Domain Wall; Magnetic Field; Coercive Force; Flux Density; Barkhausen Noise;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Schwant, R. C.. and Timo, D. P., 1985, 'Life Assessment and Improvement of Turbo Generator Rotors for Fossil Plants,' New York, Pergamon Press, pp. 325-334
2 Viswanathan, R., and Gehl, S., 1991, 'A Method for Estimation of the Fracture Toughness of Cr-Mo-V Rotor Steels Based on Composition,' Journal of Engineering Material and Technology, Vol. 113, pp. 263-270   DOI
3 Yoo, K. B., Yoon, S. H., Kim, S. T., Suh, C. M. and Nahm, S. H., 1994, 'Evaluation of J ic and T mat of Aged 1Cr-1Mo-0.25V Steel at Elevated Temperature,' Transactions of the KSME. A, Vol. 18, pp. 2860-2870
4 Lammeraner, J. and Stafl, M., 1966, Eddy Currents, Iliffe Books LTD, London, p. 40
5 Abdel-Latif, A. M., Corbett, J. M., Siedy, D. and Taplin, D. M. R., 1981, 'Effect of Microstructural Degradation on Creep Life Prediction of 2.25 Cr-1Mo Steel,' Fifth Canadian Conference on Fracture, pp. 1620-1631
6 Kim, D.W., Hong, J.H., Ahn, Band Kwon, D., 2001, 'Quantification of Barkhausen Noise Method by Microstructural Analysis and Nondestructive Evaluation of Fracture Toughness,' J. Kor: lnst. Met. & Mater., Vol. 39, pp. 301-307
7 Ryu, K.S., Nahm, S.H., Kim, Y. I., Yu, K.M and Son, D.R., 1999, 'Degradation Evaluation of Aged 1Cr1Mo-0.25V Steel Using Coercive Force,' Journal of the Korea Society for Nondestructive Testing, Vol. 19, pp. 288-292
8 Yi. J. K., Lee, B. W., and Kim, H .C., 1994, 'Nondestructive evaluation of isothermally annealed 12% CrMoV steel by magnetic BN measurement,' Journal of Magnetism and Magnetic Materials, Vol. 130, pp. 81-91   DOI   ScienceOn
9 Nam, Y. H. and Seong, U. H., 1999, 'Prediction of Fracture Appearance Transition Temperature(FATT) to Steel by Ultrasonic and Barkhausen Noise Method,' Transactions of the KSME, A, Vol. 23, No.7, pp.1215-1222
10 Ranjan, R., Jiles, D.C., and Rastogi, P.K., 1987, 'Magnetic Properties of Decarburized Steels: An Investigation of the Effects of Grain Size and Carbon Content,' IEEE Transactions of Magnetics, Vol. 23, pp. 1869-1876   DOI
11 Cullity., 1993, Introduction to Magnetic Materials, Addison-Wesley & Sons Inc, pp. 377-467