KSME International Journal

, Volume 15, Issue 11, pp 1463–1471 | Cite as

Creep characterization of type 316LN and HT-9 stainless steels by the K-R creep damage model

  • Woo-Gon Kim
  • Sung-Ho Kim
  • Woo-Seog Ryu
Materials & Fracture · Solids & Structures · Dynamics & Control · Production & Design


The Kachanov and Rabotnov (K-R) creep damage model was interpreted and applied to type 316LN and HT-9 stainless steels. Seven creep constants of the model,A, B. k, m, λ, γ, andq were determined for type 316LN stainless steel. In order to quantify a damage parameter, the cavity was interruptedly traced during creep for measuring cavity area to be reflected into the damage equation. For type 316LN stainless steel, λ=ε R /ε* and λ f =ε/ε R were 3.1 and increased with creep strain. The creep curve with λ=3.1 depicted well the experimental data to the full lifetime and its damage curve showed a good agreement whenr=24. However for the HT-9 stainless steel, the values of A and A/ were different as λ=6.2 and λ f =8.5, and their K-R creep curves did not agree with the experimental data. This mismatch in the HT-9 steel was due to the ductile fracture by softening of materials rather than the brittle fracture by cavity growth. The differences of the values in the above steels were attributed to creep ductilities at the secondary and the tertiary creep stages.

Key Words

Creep Behavior Damage Parameter Type 316LN Stainless Steel HT-9 Stainless Steel Kachanov-Rabotnov (K-R) Creep Damage Model Monkman-Grant (M -G) Strain 


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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2001

Authors and Affiliations

  1. 1.Department of Reactor Core MeerialsKorea Atomic Energy Research InstituteTaejonKorea

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