| Budget Amount *help |
¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2014: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Outline of Final Research Achievements |
In order to understand a role of the interface between γ-Fe matrix and Fe2Nb-Laves phase in the deformation of the austenitic heat resistant steels at ambient temperature, the compression response of γ-Fe bicrystal micropillars with diameters of 3～5 micrometer prepared from the γ-Fe single phase steel with a composition of Fe-20Cr-30Ni (at.%) and the two-phase steel (γ-Fe + Fe2Nb Laves phase) with a with a composition of Fe-20Cr-30Ni-2Nb-0.03B (at.%) was examined using the nanoindenter equipped with a flat punch with a size of 20 micrometer. The present study demonstrate that the interface between γ-Fe matrix and Fe2Nb-Laves phase substantially enhances the local strain hardening in γ-Fe matrix close to the grain boundary, which is likely due to its strong resistance to slip transfer at ambient temperature.
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