|Budget Amount *help
¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000)
Fiscal Year 2015: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2014: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2013: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
Fiscal Year 2012: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
|Outline of Final Research Achievements
Grain boundary engineering (GBE) was applied to 9-12Cr heat-resistant ferritic steels with lath-martensite for achieving enhanced environmental durability. We could observably increase the fraction of coincidence site lattice (CSL) boundaries along the prior austenitic boundaries in martensite through a new processing route with a combination of thermomechanical treatment and martensitic transformation. In addition, the GBE could introduce a high density of subblock structure in martensite, which resulted in a homogeneous distribution of fine M23C6 precipitates in tempered martensite. These GBEed ferricitc steels showed superior resistances against high temperature creep, steam oxidation and liquid metal corrosion.