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Creep behaviour and long-term creep life extrapolation of alloy 617 for a very high temperature gas-cooled reactor

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Abstract

Creep behaviours for Alloy 617, such as creep properties, oxidation and creep fracture morphologies were investigated by a series of creep tests with different stress levels at 1223 K. Creep constants of A, n, m, and C were obtained at 1223 K for Alloy 617. To accurately predict the long-term creep life (or strength) for Alloy 617, a multi constant method with two C in the Larson-Miller (LM) parameter was newly proposed instead of the conventional one with a unique C. The conventional method did not thoroughly match with the creep rupture data, and revealed an overestimation for the prediction of the long-term creep strength. On the other hand, the multi constant method revealed a good agreement with the creep rupture data, and this method was more accurate than the conventional one. The multi constant analysis can be used to accurately predict the long-term creep rupture life of Alloy 617 above 105 h for 1173 K, 1223 K and 1273 K.

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Authors and Affiliations

  1. Korea Atomic Energy Research Institute, 1045 Daeduk-daero, Yuseong-gu, Daejeon, 305-353, Republic of Korea

    Woo-Gon Kim, Song-Nan Yin, Yong-Wan Kim & Woo-Seog Ryu

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  1. Woo-Gon Kim
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  2. Song-Nan Yin
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  3. Yong-Wan Kim
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  4. Woo-Seog Ryu
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Correspondence to Woo-Gon Kim.

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Kim, WG., Yin, SN., Kim, YW. et al. Creep behaviour and long-term creep life extrapolation of alloy 617 for a very high temperature gas-cooled reactor. Trans Indian Inst Met 63, 145–150 (2010). https://doi.org/10.1007/s12666-010-0020-2

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  • DOI: https://doi.org/10.1007/s12666-010-0020-2

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