Characterisation of nanosized oxides in ODM401 oxide dispersion strengthened steel

Dawson, Karl; Tatlock, G. J.

doi:10.1016/j.jnucmat.2013.10.003

Cited by 33 publications

(24 citation statements)

References 26 publications

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“…Increased Si content is measured in the coarser particles and at selected grain boundaries. The presence of traces of the elements was also found in fine oxide particles with the Y 2 Ti 2 O 7 pyrochlore structure of the same ODS steel, as referred elsewhere [13]. Considering the fact that these changes in chemical composition of both particle families observed in the 14Cr ODS steel influence also the particle-matrix interface, it is likely that a process of void nucleation in the particles vicinity can be affected.…”

Section: Discussionsupporting

confidence: 60%

“…Microstructural changes of the 14Cr steel (ODM401) in response to the extremely high temperature heat treatment (1 h exposure at 1300 • C) have been observed. Especially, the growth of fine particles average size from 2 to 5 nm and a good stability of the average grain size are detected [13]. Some disagreement in aging behavior because of different manufacturing conditions is expected due to the ongoing development of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Rozumová

Hadraba

Michalička

et al. 2017

Metals

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This paper studies the impact fracture behavior of the 14%Cr Oxide Dispersion Strengthened (ODS) steel (ODM401) after high temperature exposures in helium and air in comparison to the as-received state. A steel bar was produced by mechanical alloying and hot-extrusion at 1150 • C. Further, it was cut into small specimens, which were consequently exposed to air or 99.9% helium in a furnace at 720 • C for 500 h. Impact energy transition curves are shifted towards higher temperatures after the gas exposures. The transition temperatures of the exposed states significantly increase in comparison to the as-received steel by about 40 • C in He and 60 • C in the air. Differences are discussed in terms of microstructure, surface and subsurface Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations. The embrittlement was explained as temperature and environmental effects resulting in a decrease of dislocation level, slight change of the particle composition and interface/grain boundary segregations, which consequently affected the nucleation of voids leading to the ductile fracture.

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Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Rozumová

Hadraba

Michalička

et al. 2017

Metals

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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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“…precipitation of oxide particles to nanometric size. In literature, particles with the same cubic shape and size have been identified as Y2Ti2O7 [25,26]. Tensile tests show that ODS exhibits higher mechanical performances than the unreinforced steel (Figure 5a-c).…”

Section: Hot Extruded Materialsmentioning

confidence: 98%

“…In literature, particles with the same cubic shape and size have been identified as Y 2 Ti 2 O 7 [25,26].…”

Section: Hot Extruded Materialsmentioning

confidence: 99%

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

Sanctis

Fava

Lovicu

et al. 2017

Metals

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An oxide dispersion strengthened (ODS) ferritic steel with nanometric grain size has been produced by low-energy mechanical alloying (MA) of steel powder (Fe-14Cr-1W-0.4Ti) mixed with Y 2 O 3 particles (0.3 wt %) and successive hot extrusion (HE). The material exhibits superior mechanical properties with respect to the unreinforced steel up to 400 • C; then such differences tend to progressively decrease and at 700 • C yield stress (YS) and ultimate tensile strength (UTS) values are very close. The microstructure and mechanical behaviour have been compared with those of ODS steels prepared by the most common process, high-energy MA, consolidation through hot isostatic pressing (HIP) or hot extrusion (HE), annealing around 1100 • C for 1-2 h. The main strengthening mechanisms have been examined and discussed to explain the different behaviour. In addition, heat treatments in the range 1050-1150 • C were carried out and a microstructural evolution with a relevant hardness decrease has been observed. TEM observations evidenced defect recovery and partial grain coarsening owing to the not perfectly homogeneous distribution of oxide particles.

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Characterisation of nanosized oxides in ODM401 oxide dispersion strengthened steel

Cited by 33 publications

References 26 publications

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

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

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

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