Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Ultrasonic Characteristics of Degraded Compacted Graphite Iron from 873 to 1,273 K

873~1,273 K에서 열화된 강화흑연강(Compacted Graphite Iron, CGI)의 초음파특성

  • Lee, Soo-Chul (UR Interdisciplinary Program of Mechanical Engineering, Graduate School, Pukyong National University) ;
  • Nam, Ki-Woo (Department of Materials Science and Engineering, Pukyong National University)
  • 이수철 (부경대학교 대학원 학연협동기계공학) ;
  • 남기우 (부경대학교 재료공학과)
  • Received : 2013.02.05
  • Accepted : 2013.04.16
  • Published : 2013.08.31
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Abstract

Compacted graphite iron 340 was carried out the heat treatment from 873 to 1,273 K. Compacted graphite iron 340 was evaluated relationship between the sound velocity, the attenuation coefficient and the tensile strength. The obtained results are as following. The signal strength of C scan images were weak according to increasing of heat treatment temperature and time. The amplitude of A scan and B scan was also low. This can be cause that the graphite was grown into the type of vermicular, and the many of grain boundary with ultrasound scattering were increase. The sound velocity was depend upon the heat treatment temperature and time, the attenuation coefficient had nothing to do with the temperature and time. The higher the heat treatment temperature, the tensile strength and the sound velocity were decreased. However, the tensile strength was proportional to the sound velocity. The higher tensile strength, the faster the sound velocity.

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References

  1. S. H. Jung, 2009, "Combustion characteristics of pre-mixed charge compression ignition engines with natural gas applied to 4-cylinders diesel engine" Journal of the Korea Society For Power System Engineering, 13, pp. 5-10.
  2. D-Moment, 1999, "Auto Motor und Sport", Issue 10, pp. 92-94.
  3. F. Indra and M. Thol, 1995, "Compacted graphite iron (CGI) - A new material for internal combustion engines", Fifth Aachen Colloquium on Vehicles and Automobile Technology, pp. 331-350.
  4. Y. H. Shy, C. H. Hsu, S. C. Lee and C. Y. Hou, 2000, "Effects of titanium addition and section size on microstructure and mechanical properties of compacted graphite cast iron", Materials Science and Engineering A, 278, pp. 54-60. https://doi.org/10.1016/S0921-5093(99)00599-7
  5. G. F. Geier, W. Bauer, B. J. McKay and P. Schumacher, 2005, "Microstructure transition from lamellar to compacted graphite using different modification agents", Materials Science and Engineering A, 413-414, pp. 339-345. https://doi.org/10.1016/j.msea.2005.08.159
  6. K. W. Nam, S. S. Park, S. H. Ahn, J. Y. Do and I. D. Park, 2003, "Fatigue behavior of STS316L weldments and degradation characteristic evaluation by ultrasonic test", Journal of the KSNT, Vol. 23, No. 2, pp. 156-164.
  7. W. C. Kim, J. G. Kim, D. S. Gu, H. J. Kim and B. K. Choi, 2010, "AE signal characteristics analysis caused by crack growth" Journal of the Korea Society For Power System Engineering, 14, pp. 41-46.
  8. S. Y. Lee, J. H. Jeong, S. H. Ahn and K. W. Nam, 2003, "AE Characteristic under Tensile of Polyethylene for Low Pressure Pipe", The Korean Society for Power System Engineering, Vol. 7, No. 1, pp. 82-85.
  9. S. H. Ahn, J. W. Kim, J. Y. Do and K. W. Nam, 2006, "Evaluation of the Corroded Pipe by Time-Frequency Analysis", The Korean Society for Power System Engineering, Vol. 10, No. 2, pp. 89-92.
  10. W. Orlowicz and Z. Opiekun, 1995, "Ultrasonic detection of microstructure changes in cast iron", Theoretical and Appl. Fracture Mech, Vol. 22, pp. 9-16. https://doi.org/10.1016/0167-8442(94)00043-Z
  11. D. N. Collins and W. Alcheikh, 1995, "Ultrasonic non-destructive evaluation of the matrix structure and the graphite shape in cast iron", J. of Materials Processing Technology, Vol. 55, pp. 85-90. https://doi.org/10.1016/0924-0136(95)01789-5
  12. Y. Lerner and P. Brestel, 1996, "Ultrasonic testing predicts casting properties", Advanced Materials and Processes, Vol. 11, pp. 39-41.
  13. S. E. Kruger and J. Charlier, 1998, "Ultrasonic back scattering formulation applied to cast iron characterization", Proceedings of 7th European Conf. on NDT- Copenhagen, Vol. 2, pp. 1102-1109.
  14. J. Murai, "Minimum Unite Rating Analysis Image", Japan Patent No. 2896385