| Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
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| Research Abstract |
Long-term creep life is estimated by time-temperature-parameter (TTP) methods. Such TTP methods overestimate creep life of creep strength enhanced ferritic (CSEF) steels. Decrease in activation energy Q for creep life in long-term creep of the steel is shown to be the cause of the overestimation. Creep life data of CSEF steel are divided into several data sets so that Q is unique in each divided data set, and then analyzed by a TTP method for creep life estimation. It has been proved that this multi-region analysis can properly estimate long-term creep lives. In creep of CSEF steels, recovery process of dislocation substructure is different between short-term and lon-term creep. This change in damage processes is the major cause of the decrease in Q value in long term-creep.
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