フェライト系耐熱鋼におけるクリープ破断データのばらつきと長時間強度の推定

概要

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The scatter in creep-rupture data and the accuracy of prediction by TTP (Time-temperature parameter) method for long-term creep rupture strength have been examined for 16 types of ferritic heat-resisting steels. The logarithm of long-term creep rupture time was observed to be normally distributed. The TTP of Larson-Miller (LMP) and Mason-Haferd (MHP) was used for prediction of long-term creep rupture strength. the constants of TTP (C=20 for LMP, T_a=450 and Y_a=14.55 for MHP), which are the average values of the optimized constants for each heat, were applied. An excellent prediction of long-term creep rupture strength whose RMS (root mean square) value is less than 0.3 was achieved for 95% of 87 heats of a wide variety of low alloy steels from 0.5Mo steel to 5Cr-0.5Mo steel.
社団法人日本材料学会の論文
1992-11-15