| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Research Abstract |
The effects of Si and Mn, contained in dual-phase (DP) steel and Transformation-Induced-Plasticity (TRIP) steel, on ferrite transformation and the mechanism through which these elements produce the effects were studied in a high-purity Fe-C-Si-Mn quaternary alloy by deformation of austenite prior to transformation and magnetic heat treatment (the field strength is 8 Tesla). Results were compared with calculation taking into account the co-segregation of Mn and Si caused by the interaction between Mn and Si by means of the solute-drag theory. Diffusion of Mn and Si and segregation (or accumulation) at α/γ phase boundaries both delay the transformation and are likely to produce the characteristic three stages of ferrite growth reported in the literature.
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