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Vol.46, No.3, 118 ~ 125, 2008
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| Title |
| Application of Minimum Commitment Method for Predicting Long-Term Creep Life of Type 316LN Stainless Steel |
| 김우곤 Woo Gon Kim , 윤송남 Song Nan Yin , 류우석 Woo Seog Ryu , 이찬복 Chan Bock Lee |
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| Abstract |
| A minimum commitment method(MCM) was applied to predict the long-term creep rupture life for type 316LN stainless steel(SS). Lots of the creep-rupture data for the type 316LN SS were collected through world-wide literature surveys and the experimental data of KAERI. Using these data, the long-term creep rupture life above 105 hour was predicted by means of the MCM. In order to obtain the most appropriate value for the constant A being used in the MCM equation, trial and error method was used for the wide ranges from -0.12 to 0.12, and the best value was determined by using the coefficient of determination, R2 which is a statistical parameter. A suitable value for the A in type 316LN stainless steel was found to be at -0.02 ~ -0.05 ranges. It is considered that the MCM will be superior in creep-life prediction to commonly-used time temperature parametric method, because the P(T) and G(σ) functions are determined from the regression method based on experimental data. |
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| Key Words |
| minimum commitment method, type 316LN stainless steel, time-temperature parameter, TTP, creep, creep rupture, coefficient of determination |
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