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http://dx.doi.org/10.3365/KJMM.2012.50.10.721

Reliability Evaluation on Creep Life Prediction of Alloy 617 for a Very High Temperature Reactor  

Kim, Woo-Gon (Nuclear Materials Development Division, Korea Atomic Energy Research Institute)
Park, Jae-Young (Mechanical & Automotive Engineering Department, Pukyong National University)
Kim, Seon-Jin (Mechanical & Automotive Engineering Department, Pukyong National University)
Hong, Sung-Deok (Nuclear Materials Development Division, Korea Atomic Energy Research Institute)
Kim, Yong-Wan (Nuclear Materials Development Division, Korea Atomic Energy Research Institute)
Publication Information
Korean Journal of Metals and Materials / v.50, no.10, 2012 , pp. 721-728 More about this Journal
Abstract
This paper evaluates the reliability of creep rupture life under service conditions of Alloy 617, which is considered as one of the candidate materials for use in a very high temperature reactor (VHTR) system. A Z-parameter, which represents the deviation of creep rupture data from the master curve, was used for the reliability analysis of the creep rupture data of Alloy 617. A Service-condition Creep Rupture Interference (SCRI) model, which can consider both the scattering of the creep rupture data and the fluctuations of temperature and stress under any service conditions, was also used for evaluating the reliability of creep rupture life. The statistical analysis showed that the scattering of creep rupture data based on Z-parameter was supported by normal distribution. The values of reliability decreased rapidly with increasing amplitudes of temperature and stress fluctuations. The results established that the reliability decreased with an increasing service time.
Keywords
creep; Z parameter; Larson-Miller parameter; creep life; Monte-Carlo simulation;
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