| Budget Amount *help |
¥111,670,000 (Direct Cost: ¥85,900,000、Indirect Cost: ¥25,770,000)
Fiscal Year 2009: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
Fiscal Year 2008: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2007: ¥21,580,000 (Direct Cost: ¥16,600,000、Indirect Cost: ¥4,980,000)
Fiscal Year 2006: ¥22,620,000 (Direct Cost: ¥17,400,000、Indirect Cost: ¥5,220,000)
Fiscal Year 2005: ¥42,120,000 (Direct Cost: ¥32,400,000、Indirect Cost: ¥9,720,000)
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| Research Abstract |
Special emphasis was made on the oxidation phenomenon accompanied with mass transport in the singular stress field at the crack tip region of stress corrosion crack (crack oxidation model) which has been proposed and clarified by this group. The oxide formation energy and the oxygen diffusion kinetics were evaluated quantitatively by quantum chemistry molecular dynamics. Accelerated SCC crack growth rate testing methodology was derived from crack oxidation model and used to confirm a role of such additional elements.
Crack growth rate of the stainless steel that contained plausible additive elements was increased in order of the one which contained Y〓W=Ce<Zr. Except for Zr containing steel, the crack growth rates were lower than those of nuclear grade stainless steels. In addition, the same reason was thought for the results obtained in the oxidation test underhigh stress that indicated Zr containing steel shows faster growth rate than the others. These results showed the adequacy for the model. Such disparity observed in Zr containingsteel also proposed an issue that recently reported hydrogen accelerated oxidation shall be considered in future.
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