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Evaluation of Material Degradation Using Electrical Resistivity Method

전기비저항법을 이용한 재료열화 평가

  • Published : 2000.12.01

Abstract

The remaining life estimation for the aged components in power plants as well as chemical plants are very important beacuse mechanical properties of the components are degraded with time of service exposure in high temperature. Since it is difficult to take specimens from the operating components to evaluate mechanical properties of components nondestructive techniques are needed to estimate the degradation. In this study, test materials with 4 different degradation levels were prepared by isothermal aging heat treatment at 630$\^{C}$. And the DC potential drop method and destructive methods such as tensile, K(sub)IC and hardness tests were used in order to evaluate the degradation of 1-Cr-1Mo-0.25V steels. The objective of this study is to investigate the possibility of the application of DCPD method to estimated the material degradation, and to analyse the relationship between the electrical relationship between the electrical resistivity and the degree material degradation.

Keywords

Electrical Resistivity;Electrical Resistance;Degradation

References

  1. Abdel-Latif, A. M., Corbett, J. M., Sidey, D. and Taplin, D. M. R., 1981, 'Effects of Microsturctural Degradation on Creep Life Prediction of 2-1/4Cr-1Mo Steel,' Avanced in Fracture Research, (Proc. of 5th Int. Conf. On Fracture(ICF5)), Vol. 4, pp. 1613-1620
  2. Yamashita, M., Nishii, T. and Kurihara, H., 1996, 'Resistivity Correction Factor for the Four-Point Probe Method on Cylinderical Materials,' Japanese Journal of Applied Physics, Vol. 35, pp. 1948-1953 https://doi.org/10.1143/JJAP.35.1948
  3. Abdel-Latif, A. M., Corbett, S. M. and Taplin, D. M. R., 1982, 'Analysis of Carbides Formed During Accelerated Aging of 2.25Cr-1Mo Steel,' Metal Science, Vol. 16, pp. 90-96
  4. Smits, F. M., 1958, 'Measurement of Sheet Resistivities with the Four Point Probe,' The Bell System Tech. Journal, Vol. 37, pp. 711-718
  5. Logan, M. A., 1967, 'Sheet Resistivity Measurements on Rectangular Surfaces-General Solution for Four Point Probe Conversion Factors,' The Bell System Tech. Journal, pp. 2277-2322
  6. Shi, J. and Sun, Y., 1997, 'New Method of Calculating the Correction Factors for the Measurement of Sheet Resistivity of Square with a Square Four-Point Probe,' Review of Scientific Instruments, Vol. 68, No. 4, pp. 1814-1817 https://doi.org/10.1063/1.1147998
  7. ASTM B193-87, 1992, 'Standard Test Method for Resistivity of Electrical Conductor Materials,' Annual Book of ASTM Standard, pp. 308-311
  8. ASTM F84-93, 1993, 'Standard Test Method for Measuring Resistivity of Sillicon Wafers with an In-Line Four-Point Probe,' Annual Book of ASTM Standard, pp. 135-147
  9. Valdes, A. B., 1954, 'Resistivity Measurements on Germanium for Transistors,' Proceedings of the IRE, pp. 420-427 https://doi.org/10.1109/JRPROC.1954.274680
  10. ASTM F43-93, 1993, 'Standard Test Methods for Resistivity of Semiconductor Materials,' Annual Book of ASTM Standard, pp. 50-56
  11. Viswanathan, R. and Bruemmer, S. M., 1985, 'In-service Degradation of Toughness of Steam Turbine Rotors,' Journal of Engineering Materials and Technology, (Transactions of the ASME), Vol. 107, pp. 316-324
  12. 남승훈, 김엄기, 유광민, 1998, 'Nondestructive Evaluation of Toughness Degradation of 1Cr-1Mo-0.25V Steel Using Electrical Resistivity,' 대한기계학회논문집 A, Vol. 22, No. 5, pp. 814-820
  13. 석명진, 최질현, 이동철, 문인훈, 1994, 'Sb-InSb 및 Sn-Bi 공정합금의 미세조직과 전기비저항,' 한국재료학회지, Vol. 4, No. 1, pp. 97-106
  14. Park, Y. K. and Ahn, B. Y., 1989, 'Nondestructive Evaluation of Tempering Process of S45C Steel using DC Potential Drop Measurement,' Journal of Korean Society for Nondestructive Testing, Vol. 9, No. 1, pp. 77-78
  15. 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 Materials and Technology, (Transactions of the ASME), Vol. 113, pp. 263-270