Standardization of Surface Replication Procedures for Life Assessment of High Temperature Facilities

고온설비 수명평가를 위한 표면복제 절차의 표준화

  • Published : 2000.09.01


Surface replication is playing an important role in the assessment of creep damage and remaining life of high temperature components. As the replication procedures, however, have not been standardized in domestic industry, its standardization is proposed in this study. For this purpose, the 2.25Cr-IMo steel was heat treated(5 min at 1,300 0C and oil quenched) to produce a simulated HAZ microstructure, and crept in air at 575 0C and under 120 MPa to produce artificial cavities. Then, the effect of surface preparation procedures on the quality of replicas was investigated using this sample. As a result, it was demonstrated that the presence of cavities may be observed readily or missed depending on the surface preparation procedures followed. Therefore it is essential to repeat three polishing/etching cycles at least in order to reveal cavitation damage accurately, even though it may be tedious or time-consuming.


Surface Replication;Replica;Creep;High Temperature;2.25Cr-1Mo Steel;Creep Cavity;Microstructure;Remaining Life;Life Prediction


  1. Fields, R. J., Weerasooriya, T., Ashby, M. F., 1980, 'Fracture-Mechanisms in Pure Iron, Two Austenitic Steels, and One Ferritic Steel,' Met.Trans. A., Vol. 11A, pp. 333-347
  2. Da Silveira T.L., Le May, 1992, 'Effects of Metallographic Preparation Procedure on Creep Damage Assessment,' Materials Characterization, Vol. 28, No. 1, pp. 75-86
  3. 박종서, 이해무, 백운봉, 1998, '고온설비요소의 손상평가를 위한 표면복제 절차에 관한 연구(I),' 제12회 재료강도 심포지움 및 가스터빈재료 워크숍, 대한금속학회, pp. 521-527
  4. Gandy, D. W. and Findlan, S. J., 1996, 'Replication Methods - ABB Combustion Engineering Method, ERA Method, and EPRI Method,' State-of-the-Art Weld Repair Technology for High Temperature and Pressure Parts, Vol. 1, EPRI TR-103592-Vl, pp. 3-A-1-3-A-19
  5. 田中良平 外, 'レプリカ法による損傷量評價の推裝法', 1991, レプリカ法によるクリ-プおよびクリ-プ疲勞損傷量評價マニュアル,' 日本鐵綱協會 特定基礎硏究會 構造材料の信賴性平價技術部會 高溫强度WG 硏究成果報告書 別冊 マニュアル, pp. 1-23
  6. International Organization for Standardization, 1998, 'Non-destructive testing - Metallographic Replica Techniques of Surface Examination,' ISO 3075
  7. American Society for Testing and Materials, 1996, 'Standard Practice for Production and Evaluation of Fiedl Metallographic Replicas,' ASTM E 1351