| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Nano indentation were performed for 12Cr-2W ferritic heat-resisting steels. One of the 12Cr-2W with superior creep-fatigue property showed transgranular fractures, whereas the other steel with inferior creep-fatigue property did intergranular fractures. In the inferior steel,the coares blocks neighboring the prior austenite grain boundaries were fomed during the creep-fatigue testing. Nano-scale hardness of the blocks neighboring the grain boundaries were markdely became less than those of the fine blocks inner grains after the tests. Moreover, a pop-in behavior occurred at only the coarse blocks neighring the grain boundaries. The pop-in behavior indicates that the dislocation density in the coarse blocks should be extremely lower by the recovery or rearrangement of dislocation by the creep-fatigue process at high-temperature. Therefore local deformations were assisted in the coarse blocks neighboring to grain boundaries and introduce the intergranular fractures.
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