Evaluation of Monkman-Grant parameters for type 316LN and modified 9Cr-Mo stainless steels |
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Authors: | Woo Gon Kim Sung Ho Kim Woo Seog Ryu |
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Affiliation: | (1) Department of Reactor Core Materials, Korea Atomic Energy Research Institute, Yusong, P.O. Box 105, 305-600 Daejon, Korea |
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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, andC’ were proposed and discussed for the two alloy systems. Them value of the M-G relation was 0.90 in type 316LN steel and 0.84 in modified 9Cr-Mo steel. Them’, 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. Them’ of modified relation almost overlapped regardless of the creep testing conditions and chemical variations in the two alloy
systems, and the parameterm’ was closer to unity than that of the M-G relation. |
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Keywords: | Monkman-Grant (M-G) Parameter Creep Type 316 LN Stainless Steel 9Cr-Mo Stainless Steel Steady-State Creep Rate Rupture Time |
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