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Formation of residual ferrite in 9Cr-ODS ferritic steels
Title: | Formation of residual ferrite in 9Cr-ODS ferritic steels |
Authors: | Yamamoto, M. Browse this author | Ukai, S. Browse this author →KAKEN DB | Hayashi, S. Browse this author | Kaito, T. Browse this author | Ohtsuka, S. Browse this author |
Keywords: | ODS | Ferrite | Martensite | Y2O3 | Mechanical alloying | α to γ reverse transformation | Pinning | X-ray diffraction | Thermal expansion |
Issue Date: | 25-Jun-2010 |
Publisher: | Elsevier B.V. |
Journal Title: | Materials Science and Engineering: A |
Volume: | 527 |
Issue: | 16-17 |
Start Page: | 4418 |
End Page: | 4423 |
Publisher DOI: | 10.1016/j.msea.2010.03.079 |
Abstract: | It is recognized that the high-temperature strength of 9Cr-ODS ferritic steels is maintained by the presence of a ferrite phase. In order to clarify the formation process of the ferrite phase, 9Cr-ODS ferritic steels containing various contents of Y2O3, i.e., 0 mass%, 0.1 mass%, 0.35 mass%, and 0.7 mass%, are prepared by means of mechanical alloying and hot pressing. The ferrite phase is formed by the addition of 0.35 mass% and 0.7 mass% Y2O3; however, it is not formed for steels without and with 0.1 mass% Y2O3 normalized for 1 h at 1050℃. It is considered from the thermodynamic analyses that the pinning of the α-γ interface motion by the dispersed Y-Ti complex oxide particles can be attributed to the retention of the ferrite phase normalized at 1050℃, and this ferrite phase cannot be δ-ferrite that is in equilibrium with the γ-phase. |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/43186 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鵜飼 重治
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