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Characterization of the microstructure of dual-phase 9Cr-ODS steels using a laser-assisted 3D atom probe

Nogiwa, Kimihiro; Nishimura, Akihiko ; Yokoyama, Atsushi; Otsuka, Satoshi ; Kaito, Takeji ; Inoue, Masaki ; Okubo, Tadakatsu*; Hono, Kazuhiro*

Du se 9Cr-ODS (oxide dispersion-strengthened) steel consisting of residual-$$alpha$$ ferrite and $$alpha$$ prime martensite has excellent high-temperature strength. This study describes the microstructure of dual-phase 9Cr-ODS steels characterized by atom-probe tomography in order to compare oxide-particle dispersion states in each phase. This revealed that nano-size oxide particles were of the same chemical composition and that their mean size was about 3 nm in each phase. On the other hand, the number density in the residual-$$alpha$$ phase was about four times higher than that of the $$alpha$$ prime phase. These results indicate that the dense distribution of the oxide particles in the residual-$$alpha$$ phase contribute to the excellent high-temperature strength of 9Cr-ODS steel.

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Category:Materials Science, Multidisciplinary

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