| Budget Amount *help |
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2015: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
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| Outline of Final Research Achievements |
For applications to powertrain components of automobiles and construction machines, fatigue and delayed fracture strengths of the next generation C-Si-Mn-Cr-Mo TRIP-aided martensitic (TM) steels were investigated. The main results are as followed. (1) Optimum thermo-mechanical treatment, chemical composition, fine particle peening condition and vacuum carburizing condition for the notch-fatigue of the TM steels were decided. (2) The mechanism improving the fatigue strength was proposed on the basis of fracture mechanics theory. (3) Delayed fracture strength of the TM steels was enhanced, as well as optimum chemical composition and heat-treatment condition.
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