| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The purpose of this study was to establish a fatigue crack healing technology by atomic diffusion for SS400 rolled carbon steel and SUS 316 stainless steel. By controlling the heat treatment conditions under a vacuum or reducing environment, solid phase diffusion occurred between the crack surfaces at the same time as removing the oxide film on the crack surfaces. Consequently, the fatigue crack was healed. In addition, it was suggested that the plasticity-induced crack closure, which occurs by introduction of a fatigue crack, is related as the driving force of the crack healing.
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