대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제34권6호
  • /
  • Pages.695-700
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  • 2010
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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판파를 이용한 화력 발전 설비의 물성 평가

Use of Guided Waves for Monitoring Material Conditions in Fossil-Fuel Power Plants

  • 투고 : 2009.08.17
  • 심사 : 2010.04.21
  • 발행 : 2010.06.01
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초록

가스터빈 날개를 덮고 있는 덮개판(Lock plate)의 재료 물성을 유도초음파를 이용하여 측정을 하였다. Lock plate는 가스터빈 발전소에서 아무 극한 환경에서 작동을 하는 부분 중 하나이다. 초음파 속도와 감쇠계수가 서로 다른 3가지 조건의 열처리상태의 재료 물성을 측정하는데 사용되었다. 일반적인 기계적 파괴 인장실험과 비교했을 때, 인코넬 x-750의 재료특성은 다른 열처리 조건에서 탄성계수와 포아슨비를 활용하여 비파괴적인 방법으로 더 효과적으로 알아냈다. 초음파 속도와 인코넬 x-750의 강도는 서로 비례관계에 있으며, 이러한 재료물성 측정은 여러 산업 분야에서 손상 측정에 활용될 수 있다. 또한 유도초음파 기법을 활용하여 장거리, 광범위한 진단으로 시간과 비용을 절감하는데 도움이 되리라 기대된다.

Material properties of the lock plate, which covers the gas-turbine blade, are studied using ultrasonic guided waves. The lock plate is a crucial part of a gas-turbine power plant. The wave velocity and attenuation coefficient are measured to investigate the changes in the material properties under three heat-treatment conditions. Compared to the destructive mechanical tests, the material characterization of Inconel X-750 can be performed more efficiently and nondestructively by using ultrasonic guided waves; this characterization helps identify the changes occurring in its elastic moduli and Poisson's ratio under different heat-treatment conditions. The wave velocity and hardness of Inconel X-750 are proportional to each other. This nondestructive technique for the measurement of material properties can be widely used in various industries to avoid catastrophic failure. It is also expected that the guided-wave technique can be applied as a new cost- and time-saving inspection tool for longer and wider inspection ranges.

키워드

참고문헌

  1. Jung, H., 1991, “A Study in Measurement of Thermal Aging In High Temperature Facility," Journal of the KSME, Vol.37, No.11, pp.251-260.
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  5. Rose, J. L., Rajana, K. M. and Carr, F. T., 1994, "Ultrasonic Guided Wave Inspection Concepts for Steam Generator Tubing," Material Evaluation, Vol.52, pp.307-311.
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  7. Cho, Y., 1995, "Defect Detection and Characterization Potential with Guided Waves," Ph. D. Dissertation, The Pennsylvania State University.
  8. Lee, J., Cho, Y. and Jeong, K., 2009, "Material Characterization of Lock Plate Using Guided Wave," Journal of KSME, A, Vol. 33, No. 4, pp.373-379. https://doi.org/10.3795/KSME-A.2009.33.4.373
  9. Rose, J. L., 1999, Ultrasonic Waves in Solid Media, Cambridge.
  10. Younho Cho, 2001, "Understanding and Application of Ultrasocin Guided Waves," Journal of the Korean Society for Nondestructive Testing, Vol. 21, No. 4, pp.446-463.

피인용 문헌

  1. A Study on Scattered Wave Amplitude Closed-Form Solution Calculation of Torsional Wave Mode by Reciprocity Theorem vol.40, pp.7, 2016, https://doi.org/10.3795/KSME-A.2016.40.7.647