| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Research Abstract |
The Gibbs energy functions of the phases in the high-Cr ferritic steels have been assessed thermodynamically using the CALPHAD method. Formation enthalpy of the MX and Z phases at the ground state were estimated from ab initio calculations in various combinations of transition elements from 3a to 3b groups. Of the combinations, the Z phase with Ta-, Sc-, V- group elements exhibited very low formation enthalpy. This suggests that they are significantly stable; thus these Z phases can be used as a strengthening factor of the high-Cr ferritic steels instead of the fine dispersed MX phases. The calculated phase equilibria are in good agreement with experimental data of the commercial ally (T91). The assessed Gibbs energy functions of the phases have been opened for public through the website named "NIMS thermodynamic database". From the website, the database files can be downloaded and reproduce the present results.
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