Microstructure of the {chi} phase in ODS ferritic alloys

Journal Article · Wed May 01 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00001-2· OSTI ID:233892

Zakine, C ^[1]; Bechade, J L ^[2]; Prioul, C ^[1]

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1. Ecole Centrale Paris, Malabry (France)
2. Commissariat a l`Energie Atomique, Gif sur Yvette (France). Service de Recherches Metallurgiques Appliquees

Ferritic alloys as core components of a fast neutron reactor are more resistant to swelling in the temperature range 400 to 650 C than austenitic ones but they have usually a poor creep resistance in this temperature range. In order to improve their creep properties, oxide dispersion strengthened (ODS) ferritic alloys can be elaborated by mechanical alloying, a process derived from powder metallurgy, compaction and extrusion. Therefore, two ODS ferritic alloys, DT (DT 2906) and DY (DT2203Y03), containing an intermetallic {chi} phase, have been developed by CEN/SCK, Belgium. The lattice parameter and the chemical composition of the {chi} phase have been determined by XR analysis and TEM examinations in two ODS ferritic steels. In both DT and DY alloys it is found that: the {chi} phase is partially coherent with the ferritic matrix, the stoichiometry of the {chi} phase is Fe{sub 42}Cr{sub 9}Ti{sub 5}Mo{sub 2}, and the lattice parameter is 0.886 nm. These results, which are similar to oxide free materials indicate that oxide strengthening do not affect the {chi} phase composition.

• OSTI ID: 233892
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
EXPERIMENTAL DATA
FERRITIC STEELS
INTERMETALLIC COMPOUNDS
LATTICE PARAMETERS
MATERIALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
ORIENTATION
REACTORS
STOICHIOMETRY
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY