재료열화에 따른 파괴인성치의 연성-취성 천이거동 평가

The Evaluation of Ductile-Brittle Transition of Fracture Toughness by Material Degradation

  • 김상필 ((주)대우전자) ;
  • 김형익 (성균관대학교 기계설계학과 대학원) ;
  • 석창성 (성균관대학교 기계설계학과)
  • 발행 : 2001.06.27

초록

As the huge energy transfer systems like as nuclear power plant and steam power plant are operated for a long time, 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-sired 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.

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