Comprehensive Analysis of Nanostructure of Oxide Dispersion Strengthened Steels as Prospective Materials for Nuclear Reactors

Рогожкин, С. В.; Хомич, А. А.; Bogachev, A. A.; Nikitin, A. A.; Lukyanchuk, A. A.; Разницын, О. А.; Шутов, А. С.; Vasiliev, A. L.; Presniakov, M. Yu.

doi:10.1134/s1063778820100191

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…A small number of larger (44–55 nm) oxide particles were also present, and in Eurofer ODS steel, large carbides of the M 23 C 6 type were also detected. Chemical analysis of Eurofer ODS was conducted in an earlier work [ 27 ], while new bright-field images are presented in Figure 2 . Images of oxide particles in KP-4 ODS and 13.5Cr-Fe 3 Y ODS steels, acquired using high-angle annular dark-field (HAADF) mode, are presented, as well as their chemical mapping, in Figure 3 and Figure 4 .…”

Section: Resultsmentioning

confidence: 99%

“…It is generally accepted that oxides increase the heat resistance and radiation resistance of steels, but the role of clusters is not so obvious. Moreover, in nano-oxide-strengthened steels, it is almost impossible to separate nano-oxides from clusters, and it is assumed that, in these steels, TEM and APT can detect the same objects [ 25 , 27 ]. An important role of nanoclusters was shown in [ 28 , 29 ] in irradiated ODS steels, where irradiation led to the growth of clusters and transformed them into fine oxides.…”

Section: Introductionmentioning

confidence: 99%

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Study of Precipitates in Oxide Dispersion-Strengthened Steels by SANS, TEM, and APT

Rogozhkin,

Klauz,

et al. 2024

Nanomaterials

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In this work, the nanostructure of oxide dispersion-strengthened steels was studied by small-angle neutron scattering (SANS), transmission electron microscopy (TEM), and atomic probe tomography (APT). The steels under study have different alloying systems differing in their contents of Cr, V, Ti, Al, and Zr. The methods of local analysis of TEM and APT revealed a significant number of nanosized oxide particles and clusters. Their sizes, number densities, and compositions were determined. A calculation of hardness from SANS data collected without an external magnetic field, or under a 1.1 T field, showed good agreement with the microhardness of the materials. The importance of taking into account two types of inclusions (oxides and clusters) and both nuclear and magnetic scattering was shown by the analysis of the scattering data.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Precipitates in Oxide Dispersion-Strengthened Steels by SANS, TEM, and APT

Rogozhkin,

Klauz,

et al. 2024

Nanomaterials

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“…Oxide-dispersion-strengthened (ODS) steel is one of the most promising candidate structural materials for the next-generation fusion reactors due to its excellent resistance to high-temperature creep, corrosion, and neutron radiation. [7][8][9][10][11][12] ODS steels are mainly based on the reduced activated alloys such as Fe-Cr-W system. These alloys can be divided as reduced activated ferritic martensitic (RAFM) steels with a lower Cr (9-12 wt%) content and reduced activated ferritic (RAF) ones with a higher Cr (>12 wt%) content.…”

mentioning

confidence: 99%

Fabrication of Oxide‐Dispersion‐Strengthened Ferritic Alloys by Mechanical Alloying Using Pre‐Alloyed Powder

Zhang

Zhao

et al. 2022

steel research int.

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Progress toward controllable nuclear fusion operations largely relies on the high performance of advanced nuclear structural materials. [1][2][3][4][5][6] Attributed to the extremely harsh environments where fusion reactors work, the components suffer from both high level of heat flux and high dose of neutron radiation. Oxide-dispersion-strengthened (ODS) steel is one of the most promising candidate structural materials for the next-generation fusion reactors due to its excellent resistance to high-temperature creep, corrosion, and neutron radiation. [7][8][9][10][11][12] ODS steels are mainly based on the reduced activated alloys such as Fe-Cr-W system. These alloys can be divided as reduced activated ferritic martensitic (RAFM) steels with a lower Cr (9-12 wt%) content and reduced activated ferritic (RAF) ones with a higher Cr (>12 wt%) content. Unlike RAFM steels, the RAF steels do not experience a γ-α transformation at elevated temperatures. Therefore, they can be operated at a higher temperature and have a better resistance to radiation swelling. [13][14][15] ODS steels possess a huge number of nano-oxides that are thermally stabilized in the matrix. These nanoparticles can not only hinder the movement of dislocations, but also absorb the point defects induced by irradiation, enhancing the pore expansion resistance and preventing void swelling of the materials under neutron irradiation. [16][17][18][19][20][21] For these reasons, a higher number density, a finer size, and a better distribution of the oxides are always pursued.Mechanical alloying (MA) is one of the most widely used methods to prepare ODS steels, where Y 2 O 3 powder is often added to the steel powder for long-term high-energy ball-milling. During MA, a large amount of lattice defects (e.g., vacancies and dislocations), along with the supersaturated dissolved Y and O atoms that are decomposed from the Y 2 O 3 powder, can be gradually restored in the powders. Then, powder metallurgy is conducted to this non-equilibrious MA powders to build the components with proper sizes and shapes. [22] In this step, one of the following densification strategies, that is, hot extrusion (HE), hot isostatic pressing (HIP), or spark plasma sintering (SPS), is usually carried out. [23][24][25] Assisted by the subsequent heat treatment, a huge number of Y 2 O 3 nanoparticles win the chance to simultaneously precipitate from the supersaturated matrix. In the earlier procedures, MA is definitely a timeconsuming stage. It takes an extremely long period, usually longer than 50 h, for the complete decomposition and dissolution of Y 2 O 3 through ball-milling since it has the highest bonding energy among most of the common oxides. [24][25][26] If MA process can be accelerated by a faster decomposition of the oxide

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A Study of the Effect of Magnetic Scattering on the Analysis of the Nanostructure of Oxide Dispersion-Strengthened Steels by Small-Angle Neutron Scattering

Rogozhkin,

Klauz,

Gorshkova

et al. 2024

Phys. Metals Metallogr.

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Comprehensive Analysis of Nanostructure of Oxide Dispersion Strengthened Steels as Prospective Materials for Nuclear Reactors

Cited by 8 publications

References 31 publications

Study of Precipitates in Oxide Dispersion-Strengthened Steels by SANS, TEM, and APT

Study of Precipitates in Oxide Dispersion-Strengthened Steels by SANS, TEM, and APT

Fabrication of Oxide‐Dispersion‐Strengthened Ferritic Alloys by Mechanical Alloying Using Pre‐Alloyed Powder

A Study of the Effect of Magnetic Scattering on the Analysis of the Nanostructure of Oxide Dispersion-Strengthened Steels by Small-Angle Neutron Scattering

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