2011 Fiscal Year Final Research Report
Deformation of novel austenitic heat resist ant steels under extre me environments for th ermal power plants
| Project/Area Number |
22760535
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TAKATA Naoki 東京工業大学, 大学院・理工学研究科, 助教 (70432523)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 耐熱材料 / 結晶粒界 / Laves相 / 粒界析出強化 |
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| Research Abstract |
We examined a role of grain boundary Fe_2Nb Laves phase in strengthening novel austenitic heat resistant steels for Advanced Ultra-Super Critical(A-USC) thermal power plants. The impact tests for Fe-20Cr-30Ni-2Nb steels with different area fractions of Laves phase on grain boundary(0-89%) revealed that cracks mainly propagate within grain interior ofγ-Fe matrix rather than interfaces between Laves phase andγ-Fe matrix or within Laves phase. The nano-indentation tests for Laves phase inγ-Fe matrix shows that plastic deformation by basal slip would occur at even room temperature. Thus, Laves phase has been believed brittle until now, that never reduce the ductility of steels and is promising strengthener for austenitic heat resistant steels.
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