An Experimental Study on High Temperature Material Properties of Welded Joint

용접부의 고온 재료물성에 대한 실험적 연구

Baek, Un-Bong;Yun, Gi-Bong;Seo, Chang-Min;Lee, Hae-Mu

  • Published : 2000.12.01


High temperature material properties of a welded joint were experimentally studied. Tensile and creep properties were measured for each part of weld metal. HAZ(heat affected zone) and parent metal at 538$^{\circ}C$. HAZ metal was obtained by a simulated heat treatment. Results showed that the order of tensile strength is weld>HAZ> parent both at 24$^{\circ}C$ and at 538$^{\circ}C$. Creep resistance was also the highest for weld metal and lowest for parent metal. Creep rupture life curves were obtained and converted to Monkman-Grant relation which is useful for life assessment. Use of the data obtained in this study is discussed.


Weld;Strength;Creep;HAZ;Rupture Life;Residual Life Assessment;Monkman-Grant Relation


  1. 백운봉, 윤기봉, 이해무, 서창민, 2000, 'CrMo강 용접계면균열의 크리프-피로 균열성장 거동,' 대한기계학회 논문집 A권, 제24권, 12호, pp. 3088-3095
  2. Dobe, F. and Milicka, K., 1976, 'The Relation Between Minimum Creep Rate and Time to Fracture,' Metal Science, Vol. 10, pp. 382-384
  3. 김우곤, 김대환, 류우석, 2000, '316L(N) 스테인리스강의 Monkman-Grant 크리프 수명식의 적용성,' 대한기계학회논문집 A권 제24권 제9호, pp. 2326-2333
  4. Kim, Y. J. and Lee, H., 2000, 'Decomposition of Interface Crack Driving Forces in Dissimilar Joints,' KSME International Journal, Vol. 14, No. 1, pp. 30-38
  5. 이형일, 한태수, 정재헌, 2000, '결함 해석에 기초한 배관 용접부 수명평가,' 대한기계학회논문집 A권 제24권 제5호, pp. 1331-1342
  6. Shamms M. S., 1998, 'Metallographic Methods for Predictiong the Remanent Life of Ferritic Coarse-Grained Weld Heat Affected Zones Subject to Creep Cavitation,' Int. Conf. on Life Assessment and Extension, Hauge, Netherlands
  7. ASTM, 1998, Standard Test Method for Tension Testing of Metallic Materials, ASTM E8-98
  8. ASTM, 1998, Standard Test Method for Elevated Temperature Tension Testing of Metallic Materials, ASTM E21-92
  9. ASTM, 1998, Standard Test Method for Conduciing Creep, Creep-Rupture, and Stress-Rupture Test of Metallic Materials, ASTM E139-96
  10. 윤기봉, 김광웅, 백운봉, 1998, '저합금강 용접부의 크리프 균열성장거동 모델링,' 대한기계학회논문집 A권, 제22권, 제12호, pp. 2153-2162
  11. 윤기봉, 심현우, 신영의, 1998, '고온크리프 조건에서 용접계면 균열의 $C_t$ 매개변수에 대한 수치해석적 연구,' 대한기계학회논문집 A권, 제22권, 제12호, pp. 2239-2246
  12. Saxena, A., Cretegny. L., Grover, P.S. and Norris, R.H., 1998, 'Modeling of Fracture and Crack Growth in Weld Operating at High Temperature,' Proceedings of Int. HIDA Conference, Paris, France 15-17 April
  13. Norris, R. H., 1994, 'Creep Crack Growth Behavior in weld Metal/Base Metal/Fusion Zone Regions in Chromium Molybdenum Steels,' Ph. D Thesis, Georgia Institute of Technology
  14. Grover, P. S., 1996, 'Creep-Fatigue Crack Growth in Cr-Mo-V Base Metal and Weldment,' Ph. D Thesis, Georgia Institute of Technology