Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

Spartacus, Gabriel; Malaplate, J.; Geuser, F. de; Mouton, Isabelle; Sornin, Denis; Perez, Michel; Guillou, Raphaëlle; Arnal, B.; Rouesne, Elodie; Deschamps, A.

doi:10.1016/j.actamat.2022.117992

Cited by 14 publications

(12 citation statements)

References 90 publications

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Section: Resultssupporting

confidence: 84%

“…Results are displayed in Table 2 and show a slight increase in the nano-oxide mean radius (R m ) during the manufacturing from 1.4 nm to 2.0 nm. Taking into account the thermal history of consolidation and extrusion of the material to obtain the MT state, the initial radius obtained is in agreement with radius observed or calculated in [21,32] after heating up to 1100 • C. The growth of the nano-oxides is most likely due to coalescence during the successive thermal treatments, as the volume fraction seems to remain constant. The mean radius variations remain small, as Y 2 Ti 2 O 7 pyrochlore is known to exhibit a strong stability against coarsening even at a high temperature [33].…”

Section: Hardness Evolution During the Manufacturing Routesupporting

confidence: 81%

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Dislocation Hardening in a New Manufacturing Route of Ferritic Oxide Dispersion-Strengthened Fe-14Cr Cladding Tube

Salliot,

Borbély,

Sornin

et al. 2024

Materials

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The microstructure evolution associated with the cold forming sequence of an Fe-14Cr-1W-0.3Ti-0.3Y2O3 grade ferritic stainless steel strengthened by dispersion of nano oxides (ODS) was investigated. The material, initially hot extruded at 1100 °C and then shaped into cladding tube geometry via HPTR cold pilgering, shows a high microstructure stability that affects stress release heat treatment efficiency. Each step of the process was analyzed to better understand the microstructure stability of the material. Despite high levels of stored energy, heat treatments, up to 1350 °C, do not allow for recrystallization of the material. The Vickers hardness shows significant variations along the manufacturing steps. Thanks to a combination of EBSD and X-ray diffraction measurements, this study gives a new insight into the contribution of statistically stored dislocation (SSD) recovery on the hardness evolution during an ODS steel cold forming sequence. SSD density, close to 4.1015 m−2 after cold rolling, drops by only an order of magnitude during heat treatment, while geometrically necessary dislocation (GND) density, close to 1.1015 m−2, remains stable. Hardness decrease during heat treatments appears to be controlled only by the evolution of SSD.

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Section: Resultssupporting

confidence: 84%

Section: Hardness Evolution During the Manufacturing Routesupporting

confidence: 81%

Dislocation Hardening in a New Manufacturing Route of Ferritic Oxide Dispersion-Strengthened Fe-14Cr Cladding Tube

Salliot,

Borbély,

Sornin

et al. 2024

Materials

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“…The nano-oxides dispersion in the steel is usually obtained with high-energy milling, called mechanical alloying (MA), of an as-atomized steel matrix powder and a reinforcement oxide powder, such as Y 2 O 3 . During MA, Y 2 O 3 is dissolved, leading to a near-solid solution of Y and O within the highly deformed matrix powder particles [ 10 , 11 , 12 ]. Mechanical alloying is followed by hot consolidation, Hot Isostatic Pressing (HIP), or Hot Extrusion (HE), during which densification and precipitation take place.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Ferritic ODS Steels Obtained by Laser Additive Manufacturing

et al. 2023

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This study aims to assess the potential of Laser Additive Manufacturing (LAM) for the elaboration of Ferritic/Martensitic ODS steels. These materials are usually manufactured by mechanical alloying of powders followed by hot consolidation in a solid state. Two Fe-14Cr-1W ODS powders are considered for this study. The first powder was obtained by mechanical alloying, and the second was through soft mixing of an atomized Fe-14Cr steel powder with yttria nanoparticles. They are representative of the different types of powders that can be used for LAM. The results obtained with the Laser Powder Bed Fusion (LPBF) process are compared to a non-ODS powder and to a conventional ODS material obtained by Hot Isostatic Pressing (HIP). The microstructural and mechanical characterizations show that it is possible to obtain nano-oxides in the material, but their density remains low compared to HIP ODS steels, regardless of the initial powders considered. The ODS obtained by LAM have mechanical properties which remain modest compared to conventional ODS. The current study demonstrated that it is very difficult to obtain F/M ODS grades with the expected characteristics by using LAM processes. Indeed, even if significant progress has been made, the powder melting stage strongly limits, for the moment, the possibility of obtaining fine and dense precipitation of nano-oxides in these steels.

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“…Oxide dispersion strengthened (ODS) steel is not only one of the most promising candidate cladding materials for advanced nuclear fission applications [1], but also a potential structural material for nuclear fusion power plants [2]. It is the homogeneously dispersed nano-sized oxide particles in the steel matrix that enable ODS steel to have excellent high temperature strength, corrosion resistance and radiation resistance.…”

Section: Introductionmentioning

confidence: 99%

Investigation on microstructure and tensile shear properties of 9Cr oxide dispersion strengthened steel resistance spot welded joint

Jia

Wei

2023

Science and Technology of Welding and Joining

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Resistance spot welding is employed to join the 9Cr oxide dispersion strengthened steel and the effects of different welding parameters are studied. Within the ranges of parameters used in this experiment, the failure load and energy increased from 4.3 kN, 1.0 J to 6.8 kN, 7.5 J as the welding current increased, while as the electrode force increased, the failure load and energy first decreased from 6.8 kN, 3.8 J to nearly 4 kN, 1.2 J, then remained stable. As the welding current exceeded 12.8 kA, the failure mode changed from pull out failure along the fusion line to the pull out failure along the fusion line partially and base metal partially. The welding current and electrode force strongly affect the mechanical properties and fracture mode of the joint.

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Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

Cited by 14 publications

References 90 publications

Dislocation Hardening in a New Manufacturing Route of Ferritic Oxide Dispersion-Strengthened Fe-14Cr Cladding Tube

Dislocation Hardening in a New Manufacturing Route of Ferritic Oxide Dispersion-Strengthened Fe-14Cr Cladding Tube

Assessment of Ferritic ODS Steels Obtained by Laser Additive Manufacturing

Investigation on microstructure and tensile shear properties of 9Cr oxide dispersion strengthened steel resistance spot welded joint

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