| Budget Amount *help |
¥44,720,000 (Direct Cost: ¥34,400,000、Indirect Cost: ¥10,320,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2016: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2015: ¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
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| Outline of Final Research Achievements |
No carbon, iron is iron. Iron with carbon becomes steel. Thus, it is very important to understand the role of carbon in steels. Understanding the role of carbon atoms in the microstructural evolution of carbon steels has been a key point in developing new steels. In about 100 years before this research project, it had been commonly accepted that the carbon atoms are in body-centered cubic (BCC) Fe to form a single crystal of Fe(C) martensite. Martensite is a hard structure. However, we have observed there are two crystalline phases (BCC-Fe and hexagonal ω-Fe in the Fe-C martensite. The ω-Fe is only distributed in the twinning boundary region. Based on this new finding, we started this research project. we have confirmed that the ω-Fe phase really exists together with BCC-Fe in Fe-C martensite, and have explained the formation mechanism, and also confirmed that the ω-Fe is the precursor of well-known cementite.
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