Microstructure and mechanical properties of an oxide dispersion strengthened ferritic steel by a new fabrication route

A reduced activation oxide dispersion strengthened (ODS) ferritic steel with nominal composition of Fe–12Cr–2.5W–0.25Ti–0.2V–0.4Y 2O 3 (designated 12Cr-ODS) was produced by using EDTA–citrate complex method to synthesize and add Y 2O 3 particles to an argon atomized steel powder, followed by hot iso...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2010, Vol.527 (20), p.5220-5224
Main Authors: Guo, Lina, Jia, Chengchang, Hu, Benfu, Li, Huiying
Format: Article
Language:English
Subjects:
Applied sciences
Charpy impact properties
Dispersion hardening metals
EDTA–citrate complex method
Elasticity. Plasticity
Exact sciences and technology
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Oxide dispersion strengthened
Powder metallurgy. Composite materials
Production techniques
Tensile properties
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Summary:A reduced activation oxide dispersion strengthened (ODS) ferritic steel with nominal composition of Fe–12Cr–2.5W–0.25Ti–0.2V–0.4Y 2O 3 (designated 12Cr-ODS) was produced by using EDTA–citrate complex method to synthesize and add Y 2O 3 particles to an argon atomized steel powder, followed by hot isostatic pressing at 1160 °C for 3 h under the pressure of 130 MPa, forging at 1150 °C, and heat treatment at 1050 °C for 2 h. The microstructure, tensile, and Charpy impact properties of the 12Cr-ODS steel were investigated. Transmission electron microscopy studies indicate that the 12Cr-ODS steel exhibits the characteristic ferritic structure containing few dislocations. Tensile characterization has shown that the 12Cr-ODS steel has superior tensile strength accompanied by good elongation at room temperature and 550 °C. The material exhibits very attractive Charpy impact properties with upper shelf energy of 22 J and a ductile-to-brittle transition temperature (DBTT) of about −15 °C. The formation of small, equiaxed grains and fine dispersion of oxide particles are the main reasons for the good compromise between tensile strength and impact properties.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2010.04.084