Formation of residual ferrite in 9Cr-ODS ferritic steels

Yamamoto, M.; Ukai, S.; Hayashi, S.; Kaito, T.; Ohtsuka, S.

Formation of residual ferrite in 9Cr-ODS ferritic steels

Yamamoto, M.; Ukai, S.; Hayashi, S. et al.

Materials Science and Engineering: A, 2010, 527(16-17), 4418-4423

Permalink : https://hdl.handle.net/2115/43186

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アクセス権	open access
URI	https://hdl.handle.net/2115/43186
タイトル	Formation of residual ferrite in 9Cr-ODS ferritic steels
著者	Yamamoto, M. ; Ukai, S. ; Hayashi, S. ; Kaito, T. ; Ohtsuka, S.
著者名 Yamamoto, M.
e-Rad_Researcher 00421529 著者名 Ukai, S.
著者名 Hayashi, S.
著者名 Kaito, T.
著者名 Ohtsuka, S.
言語	英語
キーワード	ODS
	Ferrite
	Martensite
	Y2O3
	Mechanical alloying
	α to γ reverse transformation
	Pinning
	X-ray diffraction
	Thermal expansion
発行日	2010-06-25
出版者	Elsevier B.V.
収録物名	Materials Science and Engineering: A
巻(号)	527(16-17)
ページ	4418-4423
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0921-5093
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.msea.2010.03.079