Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Evaluation of Monkman-Grant Parameters for Type 316LN and Modified 9Cr-Mo Stainless Steels

  • Kim, Woo-Gon (Department of Nuclear Material Technology Development, Korea Atomic Energy Research Institute) ;
  • Kim, Sung-Ho (Department of Nuclear Material Technology Development, Korea Atomic Energy Research Institute) ;
  • Ryu, Woo-Seog (Department of Nuclear Material Technology Development, Korea Atomic Energy Research Institute)
  • Published : 2002.11.01
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Abstract

The Monkman-Grant (M-G) and its modified parameters were evaluated for type 316LN and modified 9Cr-Mo stainless steels prepared with minor element variations. Several sets of creep data for the two alloy systems were obtained by constant-load creep tests in 550～650$\^{C}$ temperature range. The M-G parameters, m, m', C, and C' were proposed and discussed for the two alloy systems. The m value of the M-C relation was 0.90 in type 316LN steel and 0.84 in modified 9Cr-Mo steel. The m' value of the modified relation was 0.94 in type 316LN steel and 0.89 in 9Cr-Mo steel. Although creep fracture modes and creep properties between type 316LN and modified 9Cr-Mo steels showed a basic difference, the M-G and its modified relations demonstrated linearity quite well. The m' of modified relation almost overlapped regardless of the creep testing conditions and chemical variations in the two alloy systems, and the parameter m' was closer to unity than that of the M-G relation.

Keywords

References

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