Creep Design of Type 316LN Stainless Steel by K-R Damage Theory

K-R 손상이론에 의한 316LN 스테인리스강의 크리프 설계

  • Kim, U-Gon (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute) ;
  • Kim, Dae-Hwan (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute) ;
  • Ryu, U-Seok
  • 김우곤 (한국원자력연구소 원자력재료기술개발팀) ;
  • 김대환 (한국원자력연구소 원자력재료기술개발팀) ;
  • 류우석
  • Published : 2001.02.01


Kachanov-Rabotnov(K-R) creep damage theory was reviewed, and applied to design a creep curve for type 316LN stainless steel. Seven coefficients used in the theory, i.e., A, B, k, m, λ, r, and q were determined, and their physical meanings were analyzed clearly. In order to quantify a damage parameter ($\omega$), cavity amount was measured in the crept specimen taken from interrupted creep test with time variation, and then the amount was reflected into K-R damage equations. Coefficient λ, which is regarded as a creep tolerance feature of a material, increased with creep strain. Mater curve with λ=2.8 was well coincided with an experimental one to the full lifetime. The relationship between damage parameter and life fraction was matched with the theory at exponent ${\gamma}$=24 value. It is concluded that K-R damage equation was reliable as the modelling equation for type 316LN stainless steel. Coefficient data obtained from type 316LN stainless steel can be utilized for life prediction of operating material.


Damage Parameter;316LN Stainless Steel;Kachanov-Rabotnov Creep Damage;Monkman-Grant Strain;Creep Rate;Creep Cavity


  1. G. Belloni, G. Bernasconi and G. Piatti, 1977, 'Creep Damage and Rupture in AISI 310 Austenitic Steel,' Meccanica, Vol. 12, pp. 84-96
  2. 김우곤, 김대환, 류우석, 국일현, 1998, 'AISI 316(N) 스테인리스강의 Creep 특성에 미치는 인(P)의 효과,' 한국원자력학회 '98 추계학술대회논문집, p. 216
  3. H. Riedel, 1987, 'Fracture at High Temperature,' Printed by Spriger-Verlag Berlin, Heidelberg, p.390
  4. B. J. Cane and C. J., 1981, Middleton, 'Intergranular Creep cavity Formation in Low Alloy Bainitic Steels,' Metal Sci., Vol. 15
  5. H. Stamm and U. Estorff, 1992, 'Determination of Creep Damage in Steels,' Pro. 5th Int., Conf. on Creep of Materials, Florida, USA
  6. D. L., Marriott and R. K. Penny, 1973, 'Strain Accumulation and Rupture During Creep Under Variable Uniaxial Tensile Loading,' J. Strain Anal., Vol. 8. p.3
  7. R. K. Penny, 1974, 'The Usefulness of Engineering Damage Parameters During Creep,' Vol. 8. pp. 278-283
  8. D. Mclean, 1973, 'Materials Science in High Temperature Service,' Academia Nazionale dei Lincei, Roma
  9. T. Nakamura, 1988, 'Effects of Nitrogen and Carbon on Creep Properties of Type 316 Stainless Steels,' Proc. High Nitrogen Steels Conf., HNS 88, pp. 218-224
  10. J. K. Lai and A. Wickens, 1979, 'Microstructural Changes and Variations in Creep Ductility of 3 Casts Type 316 Stainless Steel,' Acta. Metal, Vol. 27, p. 217
  11. 김우곤, 김대환, 류우석, 2000, '316L(N) 스테인리스강의 Monkman-Grant 크리프 수명식의 적용성,' 대한기계학회논문집 A권, 제24권, 제9호, pp. 2326-2333
  12. 김건영,이강용, 1996l, '금속조직 대비법에 의한 고온고압부 크리프손상의 수명평가,' 대한기계학회 '96학술대회논문집, KSME 96MF14, pp. 90-96
  13. 김진영, 이순복, 허용학, 1999, '크리프 구성방정식의 재료상수 결정,' 대한기계학회 '99춘계학술대회 논문집 A, p. 783
  14. 류우석, 김우곤 외, 1998, '액체금속로 구조재료 개요,' KAERI/AR-487/98