Characterization of precipitates in MA/ODS ferritic alloys

Miller, M.K.; Russell, K.F.; Hoelzer, David T.

doi:10.1016/j.jnucmat.2006.02.004

Cited by 253 publications

(136 citation statements)

References 13 publications

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“…After heat treatment at 1350 • C the microhardness of both alloys was found smaller by about 30%. This trend is in a good accordance with the literature data [8,9] however, the overall hardness presented here slightly varies with the ODS alloys manufactured using different parameters.…”

Section: Mechanical Properties Of the Ods Steelssupporting

confidence: 92%

Influence of Y2O3 and Fe2Y additions on the formation of nano-scale oxide particles and the mechanical properties of an ODS RAF steel

Oksiuta

Lewandowska

Unifantowicz

et al. 2011

Fusion Engineering and Design

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a b s t r a c tThe main goal of this work was to manufacture an oxide dispersion strengthened (ODS) reduced activation ferritic steel from a pre-alloyed, gas atomised Fe-14Cr-2W-0.2Ti (in wt.%) powder mechanically alloyed with either 0.3%Y 2 O 3 or 0.5%Fe 2 Y particles and consolidated by hot isostatic pressing, and to investigate its microstructure, microhardness and Charpy impact properties.A lower oxygen content was measured in the ODS Fe 2 Y steel than in the ODS Y 2 O 3 steel. However, the mean size of nanoclusters in the ODS Fe 2 Y steel was found larger, whereas density was smaller, than in the ODS Y 2 O 3 steel. In addition, the nanoclusters in the ODS Fe 2 Y steel appear less stable upon thermal annealing at 1350• C for 1 h. Vickers microhardness measurements revealed that after HIPping the ODS Y 2 O 3 is about 40% harder (366 HV 0.1 ) than the ODS Fe 2 Y (260 HV 0.1 ). After heat treatment at 1350• C the microhardness of both alloys was found smaller by about 30%. The ODS Fe 2 Y steel was found to exhibit a much better Charpy impact behaviour, with an upper shelf energy of 8.8 J and a ductileto-brittle transition temperature of −24• C. The differences in mechanical properties were discussed in terms of the oxygen content as well as in the mean size, number density and crystallographic structure of the nanoclusters.

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Section: Mechanical Properties Of the Ods Steelssupporting

confidence: 92%

Influence of Y2O3 and Fe2Y additions on the formation of nano-scale oxide particles and the mechanical properties of an ODS RAF steel

Oksiuta

Lewandowska

Unifantowicz

et al. 2011

Fusion Engineering and Design

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“…In ODS steels, the oxides are often referred to as nano-oxide dispersions since typical oxide particle diameters on the order of < 100 nm. [43][44][45][46][47] Mobile dislocations interact with nanometer-sized oxide particles via mechanisms involving direct particle shearing [48,49] and/or circumventing the particle via a bypass manoeuver, such as the looping mechanism as proposed by Orowan, [50] depending on the particle-matrix coherency and degree of bonding between the particle and the matrix, the energy penalty of this bypass mechanism being proportional to the material flow stress. [51,52] However as particle size and spacing increases, their ability to hinder dislocation mobility via individual particle-dislocation interactions diminishes, and their relatively large volumes cause multiple dislocations to agglomerate in the form of dislocation forests on the surface of oxide particles.…”

Section: Discussionmentioning

confidence: 99%

Tensile Fracture Behavior of 316L Austenitic Stainless Steel Manufactured by Hot Isostatic Pressing

Cooper

Brayshaw

Sherry

2018

Metall Mater Trans A

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Herein we investigate how the oxygen content in hot isostatically pressed (HIP'd) 316L stainless steel affects the mechanical properties and tensile fracture behavior. This work follows on from previous studies, which aimed to understand the effect of oxygen content on the Charpy impact toughness of HIP'd steel. We expand on the work by performing room-temperature tensile testing on different heats of 316L stainless steel, which contain different levels of interstitial elements (carbon and nitrogen) as well as oxygen in the bulk material. Throughout the work we repeat the experiments on conventionally forged 316L steel as a reference material. The analysis of the work indicates that oxygen does not contribute to a measureable solution strengthening mechanism, as is the case with carbon and nitrogen in austenitic stainless steels (Werner in Mater Sci Eng A 101:93-98, 1988). Neither does oxygen, in the form of oxide inclusions, contribute to precipitation hardening due to the size and spacing of particles. However, the oxide particles do influence fracture behavior; fractography of the failed tension test specimens indicates that the average ductile dimple size is related to the oxygen content in the bulk material, the results of which support an on-going hypothesis relating oxygen content in HIP'd steels to their fracture mechanisms by providing additional sites for the initiation of ductile damage in the form of voids.

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“…The typical creep strength of the ferritic ODS alloys is estimated, in the available literature, to be 60 (40) MPa for coarse-grained structures and 20 (6) MPa for fine-grained structures at 1000 (1100)°C 9 . New ODS ferritic steels are currently in development at Oak Ridge National Laboratories [10][11][12][13] . Sufficient amounts of Al and/or Cr in the ODS alloys are crucial for their oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

Investigation on new creep- and oxidation-resistant materials

Khalaj¹,

Mašek²,

Jirková³

2015

Mater. Tehnol.

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The specific mechanical property and structure of a material can be achieved by combining various types of materials and technologies. The main aim of this research is to develop new creep-and oxidation-resistant materials (ODS) (new ODS Fe-Al based alloys and ODS composites) applicable at high temperatures of up to about 1100°C. The new ODS composites consist of a ferritic Fe-Al matrix strengthened with about volume fractions 2 % to 30 % of Al2O3 particles. In order to find the optimum material structure, different oxide amounts were added to three different containers. Also, to find the influence of the temperature on the obtained structures, three processing temperatures of (26, 750 and 1150)°C were used with the specific deformation profile. An analysis of the structures was performed using different analytical methods such as light microscopy, scanning electron microscopy and X-ray diffraction analysis. Keywords: ODS steel, alloys, composite, creep, Fe-Al Posebne mehanske lastnosti in strukturo materiala je mogo~e dose~i s kombinacijo razli~nih vrst materialov in tehnologij. Glavni namen tega~lanka je razviti nov material, odporen proti lezenju in oksidaciji (ODS), tj. novo ODS-zlitino na osnovi Fe-Al in ODS-kompozite, uporabne pri visokih temperaturah do 1100°C. Novi ODS-kompozit je sestavljen iz feritne Fe-Al-osnove, oja~ane z okrog volumenskim dele`em od 2 % do 30 % delcev Al2O3. Da bi dobili optimalno strukturo materiala, je bil v tri vsebnike prime{an razli~en dele`oksida. Za ugotovitev vpliva temperature na dobljeno strukturo so bile uporabljene tri temperature izdelave (26, 750 in 1150)°C s posebnim profilom deformacije. Analiza strukture je bila izvr{ena z razli~nimi metodami, kot so svetlobna mikroskopija, vrsti~na elektronska mikroskopija in rentgenska difrakcija.

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Characterization of precipitates in MA/ODS ferritic alloys

Cited by 253 publications

References 13 publications

Influence of Y2O3 and Fe2Y additions on the formation of nano-scale oxide particles and the mechanical properties of an ODS RAF steel

Influence of Y2O3 and Fe2Y additions on the formation of nano-scale oxide particles and the mechanical properties of an ODS RAF steel

Tensile Fracture Behavior of 316L Austenitic Stainless Steel Manufactured by Hot Isostatic Pressing

Investigation on new creep- and oxidation-resistant materials

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