계장화 압입시험법을 이용한 보일러 설비의 고온 기계적 물성 측정과 수명 평가

High-temperature Mechanical Properties Measurement and Life Assessment of Boiler Equipment by Instrumented Indentation Technique

  • 발행 : 2009.06.30

초록

Recently power plants and oil refineries are focusing on capacity enlargement for better efficiency through higher temperature and higher pressure. Thickness of boiler tubes becomes lessened due to oxidation and erasion caused by high temperature bums gas flowing over tubes outside. Accordingly, mechanical stress of tubes is increasing and that is a critical factor to make a crack and fracture. To prevent those sorts of accidents, aging assessment for proper periodic repair and replacement should be conducted reliably and reasonably. We performed IIT test on Cr-Mo steel, one of the most heat-resistant materials for facilities in power plants, and we report the test result and the considerable effectiveness of IIT test.

키워드

참고문헌

  1. J.-H. Ahn and D. Kwon, 'Derivation of Plastic Stress-Strain Relationship from Ball Indentation: Examination of Strain Definition and Pileup Effect', Journal of Materials Research Vol. 16 pp. 3170- 3178, 2001 https://doi.org/10.1557/JMR.2001.0437
  2. Jung-Suk Lee, Jae-il Jang, Baik-Woo Lee, Yeol Choi, Seung Gun Lee and Dongil Kwon, 'An instrumented indentation technique for estimating fracture toughness of ductile materials: A critical indentation energy model based on continuum damage mechanics', Acta Materialia Vol. 54, pp. 1101-1109, February, 2006 https://doi.org/10.1016/j.actamat.2005.10.033
  3. 백운봉, 이해무, 박종서, 윤기봉, '고온용 압력용기의 크리프 균열성장 잔여수명평가 사례 연구', 산업안전학회지, 제16권, 제3호, pp. 26-30, 2001
  4. Suresh, S. and Giannakopoulos, A.E., 'A new method for estimating residual stresses by instrumented sharp indentation', Acta Materialia, Vol. 46, Issue 16, pp. 5755-5767, 9 October, 1998 https://doi.org/10.1016/S1359-6454(98)00226-2
  5. 권양미, 마영화, 조성욱, 윤기봉, '고온배관 T-부의 응력해석 및 잔여수명평가', 산업안전학회지, 제20권, 제3호, pp. 34-41, 2005
  6. F.R. Larson and J. Miller, Trans. ASME, 74, 765, 1952
  7. Y. Zhou, B. Devarajan, K.L. Murty, 'Short-term rupture studies of Zircaloy-4 and Nb-modified Zircaloy-4 tubing using closed-end internal pressurization', Nuclear Engineering and Design, Volume 228, Issues 1-3, pp. 3-13, March 2004 https://doi.org/10.1016/j.nucengdes.2003.06.013
  8. P. Chellapandi, R. Srinivasan, S.C. chetal, B. Raj, 'Experimental creep life assessment of tubular structures with geometrical imperfections in welds with reference to fast reactor plant life', International Journal of Pressure Vessels and Piping, Volume 83, Issue 7, pp. 556-564, July 2006 https://doi.org/10.1016/j.ijpvp.2006.03.009
  9. R. Viswanathan, Damage Mechanism and Life Assessment of High Temperature Components, ASM International, Metals Park, Ohio, 1989
  10. 안정훈, 최열, 권동일, '압입하중.변위곡선의 해석을 통한 재료의 소성유동특성 평가', 대한금속재료학회지, 제38권, 제12호, pp. 1606-1611, 2000
  11. G.E. Dieter, Mechanical Metallurgy: SI Metric Edition, McGraw-Hill, Singapore, 1988
  12. T.L. Anderson, Fracture Mechanics: Second Edition, CRC Press, Florida, 1995
  13. DIN 17175-79, Seamless Steel Tubes for Elevated Temperatures, 1979
  14. ASME B&PV Part A, Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater and Heat-Exchanger Tubes, 2004