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Formation of residual ferrite in 9Cr-ODS ferritic steels

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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
Mechanical alloying
α to γ reverse transformation
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)
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)

Submitter: 鵜飼 重治

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