| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2009: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2008: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
|
|---|
| Research Abstract |
Friction stir welding was performed for carbon steel with different carbon contents including hyper eutectoid steel below and above the A_1 point (eutectoid temperature 723℃). The microstructures of the above A_1 joints mainly consist of martensite for higher carbon steels. Therefore, the tensile tests results are scattered. On the other hand, the microstructures of the below A_1 joints consist of a ferrite with globular cementite. The absorbed energy for the small Charpy impact test is increased for the below A_1 joints by three times.
|
