| Budget Amount *help |
¥43,160,000 (Direct Cost: ¥33,200,000、Indirect Cost: ¥9,960,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2013: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2012: ¥22,360,000 (Direct Cost: ¥17,200,000、Indirect Cost: ¥5,160,000)
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| Outline of Final Research Achievements |
Extraordinary static mechanical properties were obtained by MIM (Metal Injection Molding) Fe-6Ni-0.4C steels, which is considered as a result of heterogeneous microstructure with the Ni rich phases (martensite or retained austenite) surrounded by network of tempered martensite. Moreover, 3 kinds of MIM Fe-Ni steels with different content of Ni (4, 6, 8 mass%) are fabricated and the dynamic fatigue properties are investigated by the rotary bending fatigue testing. The Fe-6Ni-0.4C steel with the relative density of 95 % shows the highest fatigue strength of 650 MPa, which is as same strength as the powder forged steel with full density. As the results, the heterogeneous microstructure can be proved to have a great effect on not only the static but also the dynamic mechanical properties. And to obtain the best mechanical properties, the heterogeneity of the microstructure should be controlled appropriately.
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