Microstructure and Charpy impact properties of 12–14Cr oxide dispersion-strengthened ferritic steels

Oksiuta, Z.; Baluc, N.

doi:10.1016/j.jnucmat.2007.08.004

Cited by 57 publications

(28 citation statements)

References 15 publications

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“…In this sense, until now, powder metallurgy was the only technique proposed as the ultimate production route to obtain a dispersion of non metallic nanoparticles in a steel matrix aiming the enhancement of creep strength at elevated temperatures. 5,6) However, this method does not allow the production of large quantities exhibiting excellent quality, in terms of microstructural and mechanical properties homogeneity. 7) Furthermore, recent research works have reported laboratory scale investigations aiming at the dispersion of nanopowders based on liquid metallurgy with promising results.…”

Section: Introductionmentioning

confidence: 99%

Wetting Behavior of Sintered Nanocrystalline Powders by Armco Fe and 22CrNiMoV5-3 Steel Grade Using Sessile Drop Wettability Technique

Amondarain

Kolbeinsen

Arana³

2011

ISIJ Int.

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The wettability of sintered nanocrystalline oxide powders (CeO2, TiO2, Y3Al5O12, and ZrO2-yttria stabilized) and Al2O3 basis powder (60-70% purity) (product originated in the secondary aluminium production, composed mainly of nano and micrometric aluminium oxide) by liquid Armco Fe and by 22CrNiMoV5-3 steel grade was studied using sessile drop wettability technique. The powders were pressed and sintered under different pressures, heating rates and holding times. The later grinding and polishing surface treatments were characterized by infinite focus microscope. The wetting experiments were carried out under pure Ar atmosphere. A small piece of Armco Fe and steel grade was melted on sintered nano oxides, heating up to 1 600°C with a holding time of 10 minutes for each experiment. The contact angles were measured and chemical analyses were conducted on tested samples to characterize the wetting reactions. It was found that sintered nano TiO2 not only suffered considerable wetting by Armco Fe and 22CrNiMoV5-3 steel in both cases, but also reacted with the substrate to form ilmenite and pseudobrookite. The CeO2 substrate and Armco Fe system also showed good wetting behavior. In general terms, it was concluded that wettability was affected by substrate chemical composition, and surface characteristics by sintering conditions. The preliminary results of this investigation may help to determine the suitability of the nanoparticle to be added in a liquid iron based matrix in order to influence the microstructure evolution improving mechanical properties by a fine distribution in the metallic alloy.KEY WORDS: high temperature wettability; metal/ceramic system; sessile drop technique.

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Section: Introductionmentioning

confidence: 99%

Wetting Behavior of Sintered Nanocrystalline Powders by Armco Fe and 22CrNiMoV5-3 Steel Grade Using Sessile Drop Wettability Technique

Amondarain

Kolbeinsen

Arana³

2011

ISIJ Int.

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“…The procedure of powder consolidation consisted of canning, vacuum degassing at 450°C and HIPping at 1150°C for 3 h followed by the HSHE procedure at 900°C in order to close the residual porosity and homogenise bimodal grain size microstructure, which was observed after HIPping [9]. Following the hydrostatic extrusion, two kinds of heat treatment were performed: (i) long-term ageing at 750°C for 10000 h in the atmospheric air and (ii) annealing at 850-1350°C for 1 h in air, allowing to slowly cool down in the furnace to ambient temperature.…”

Section: Methodsmentioning

confidence: 99%

High-temperature oxidation resistance of ultrafine-grained 14 %Cr ODS ferritic steel

Oksiuta

2013

J Mater Sci

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“…More detailed information about sample preparation is reported elsewhere [8,9]. The specimen surface was mechanically polished by SiC abrasive papers using a final grit of 1000.…”

Section: Methodsmentioning

confidence: 99%

High heat flux testing of 12–14Cr ODS ferritic steels

Pintsuk

Oksiuta

Linke

et al. 2010

Journal of Nuclear Materials

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a b s t r a c tThe thermal performance of Fe-(12-14)Cr-2W-0.3Ti-0.3Y 2 O 3 ODS reduced activation ferritic steels, which are considered as candidate first wall materials for the future fusion power reactors and were manufactured by mechanical alloying in hydrogen and hot isostatic pressing, was assessed by high heat flux (HHF) testing with the electron beam JUDITH facility at the Forschungszentrum Jülich (FZJ), Germany. An analysis of the microhardness and microstructure of the specimens was done before and after HHF tests.In general, both materials present a ferritic (a-Fe, bcc) microstructure with a wide range of grain sizes from 100 to 500 nm up to a few micrometers. The coarse grains are almost dislocation-free, while the smaller ones are surrounded by tangles of dislocations. Oxide and carbide impurities (about a few hundreds nm in size) and a high density of Y-Ti-O nano-clusters, with a mean size of about 5 nm, are also present. The microhardness, density and tensile strength of the 14Cr material are slightly larger than those of the 12Cr material.HHF tests revealed that there is no difference in thermal performance, level of degradation and erosion behaviour of 12Cr and 14Cr ODS steels. The onset of melting of the materials occurs for an energy density between 1 and 1.5 MJ/m 2 . Below this value only some kind of thermal etching takes place. This is a significant improvement compared to stainless steel, for which severe plastic deformation at the material surface was observed.

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Microstructure and Charpy impact properties of 12–14Cr oxide dispersion-strengthened ferritic steels

Cited by 57 publications

References 15 publications

Wetting Behavior of Sintered Nanocrystalline Powders by Armco Fe and 22CrNiMoV5-3 Steel Grade Using Sessile Drop Wettability Technique

Wetting Behavior of Sintered Nanocrystalline Powders by Armco Fe and 22CrNiMoV5-3 Steel Grade Using Sessile Drop Wettability Technique

High-temperature oxidation resistance of ultrafine-grained 14 %Cr ODS ferritic steel

High heat flux testing of 12–14Cr ODS ferritic steels

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