Evaluation of the Ductile-Brittle Transition Behavior of fracture Toughness by Material Degradation

열화에 따른 파괴인성치의 연성-취성 천이거동 평가

  • 석창성 (성균관대학교 기계공학부) ;
  • 김형익 (성균관대학교 대학원 기계설계학과) ;
  • 김상필 (㈜현대자동차)
  • Published : 2003.05.01

Abstract

As the huge energy transfer systems like as nuclear power plant and steam power plant are operated for a long time at a high temperature, mechanical properties are changed and ductile-brittle transition temperature is raised by degradation. So it is required to estimate degradation in order to assess the safety, remaining life and further operation parameters. The sub-sized specimen test method using surveillance specimen was developed for evaluating the integrity of metallic components. In this study, we would like to present the evaluation technique of the ductile-brittle transition temperature by the sub-sized specimen test. The four classes of the thermally aged 1Cr-1Mo-0.25V specimens were prepared using an artificially accelerated aging method. The tensile test and fracture toughness test were performed. The results of the fracture toughness tests using the sub-sized specimens were compared with the evaluation technique of the ductile-brittle transition temperature.

Keywords

References

  1. 김정규, '산업설비의 수명평가 기술,' 산업설비 안전성평가 연구센터 기술분석 보고서, SAFE 97-1, pp. 3, 1997
  2. 정희돈, '고온설비의 경년열화와 측정법,' Journal of KSME, Vol. 31, No. 3, pp. 251-260, 1991
  3. R. Viswanathan and S. Gehl, 'A Method for Estimation of the Fracture Toughness of CrMoV Rotor Steels Based on Composition,' Journal of Engineering Materials and Technology (Transactions of the ASME), Vol. 113, pp. 263-270, 1991 https://doi.org/10.1115/1.2903401
  4. 'Standard Test Method for Tension Testing of Metallic Materials,' ASTM E8-95a, pp. 56-76, 1995
  5. 'Standard Test Method forMeasurement of Fracture Toughness,' ASTM E 1820-01, 2001
  6. 홍경태, 도정만, 허성강, 김건영, 'Cr-Mo 저합금 강에서 탐화물의 변화 양상과 경년 열화와의 관계,' 제 1회 경년열화 및 수명평가 심포지움 논문집, pp. 105-109, 1991
  7. 권재도, 박중철, 이우호, 박윤원, 원전기기용 CF8M의 $430^{\circ}C$열화 특성에 관한 연구, 원전기기 워크샵, pp. 129-142, 1998
  8. 서창민, 윤기봉, 윤석호, 김승태, '열화시킨 1Cr-1Mo-0.25V강의 고온에서의 JIC및 Tmat 평가,' Proceeding of the 2nd Symposium on Material Degradation and Life Prediction, 경년열화 및 수명평가연구회, pp. 27-55, 1992