Application of Minimum Commitment Method for Predicting Long-Term Creep Life of Type 316LN Stainless Steel

摘要

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 10~5 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, R~2 which is a statistical parameter. A suitable value for the A in type 316LN stainless steel was found to be at -0.02 approx -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(sigma) functions are determined from the regression method based on experimental data.