Suppression effect of nano-sized oxide particles on helium irradiation hardening in F82H-ODS steel

Chen, S.; Wang, Y.; Tadaki, K.; Hashimoto, Naoyuki; Ohnuki, Somei

doi:10.1016/j.jnucmat.2014.06.041

Cited by 21 publications

(8 citation statements)

References 21 publications

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“…In particular, it was revealed in previous studies that the lower the temperature of the irradiation the higher the degree of hardness [36,38]. The dose and the radiation damage must be high enough to result in the increased hardening [39,41]. The effect of the irradiation was also revealed to depend on the irradiated material [39,40].…”

Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 93%

“…This 14 observation may contribute to a better understanding of mechanisms underlying irradiationinduced effects by He ions in Fe-Cr alloys and produced therefrom nuclear structural materials. In the available literature there are numerous reports on the issue e. g. [13,14,[34][35][36][37][38][39][40][41]. The reported results have not permitted to obtain the full understanding of the underlying mechanism and the observed effects like enhanced hardening, embrittlement and swelling are still a matter of discussion and even controversy.…”

Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 99%

“…The dose and the radiation damage must be high enough to result in the increased hardening [39,41]. The effect of the irradiation was also revealed to depend on the irradiated material [39,40]. The observed mechanical effects of the He-irradiation are most frequently explained in terms of formation of He-bubbles, especially small ones, and also changes in the microstructure induced by the displacement damage [35,36].…”

Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 99%

See 2 more Smart Citations

Effect of 0.25 and 2.0 MeV He-Ion Irradiation on Short-Range Ordering in Model (EFDA) Fe-Cr Alloys

Dubiel

Żukrowski

Serruys

2018

Metall Mater Trans A

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The effects of He + irradiation on a distribution of Cr atoms in 10.75, 15.15) alloys were studied by 57 Fe Conversion Electron Mӧssbauer Spectroscopy (CEMS). The alloys were irradiated with doses up to 12 x10 16 ions/cm 2 with 0.25 and 2.0 MeV He + ions. The distribution of Cr atoms within the first two coordination shells around Fe atoms was expressed with short-range order parameters 1 (first-neighbour shell, 1NN), 2 (secondneighbour shell, 2NN) and 12 (1NN+2NN). In non-irradiated alloys 1>0 and 2<0 was revealed for all three samples. The value of 120, i.e. the distribution of Cr atoms averaged over 1NN and 2NN, was random. The effect of the irradiation of the Fe94.2Cr5.8 alloy was similar for the two energies of He + viz. increase of number of Cr atoms in 1NN and decrease in 2NN.Consequently, the degree of ordering increased. For the other two samples, the effect of the irradiation depends on the composition, and is stronger for the less energetic ions where, for Fe89.25Cr10.75 alloy, the disordering disappeared and some traces of Cr clustering appeared. In Fe84.85Cr15.15 alloy the clustering was clear. In the samples irradiated with 2. 0 MeV He + ions the ordering also survived in the samples with x=10.75 and 15.15, yet its degree became smaller than in the Fe94.2Cr5.8 alloy.2

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Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 93%

Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 99%

Section: Effect Of He + Energy and Chromium Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Effect of 0.25 and 2.0 MeV He-Ion Irradiation on Short-Range Ordering in Model (EFDA) Fe-Cr Alloys

Dubiel

Żukrowski

Serruys

2018

Metall Mater Trans A

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“…e load range, number of load cycles, and specimen geometry are three major variables for fatigue failure [21][22][23]; hence, studying the load distribution and evolution is significant for the moulding process. In the blade rolling process, the roller cavity surfaces squeeze the work blank with the rotation of rollers, and the blank occurred plastic deformation by the squeezing action.…”

Section: The Contact Responses and Evolutions Of Roller Cavity Surfacesmentioning

confidence: 99%

Investigating the Contact Responses of the Roller Cavity Surfaces in the Compressor Blade Rolling Process

Jin

Wang

Jiang

2020

Advances in Materials Science and Engineering

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The investigation of the contact responses is the key for evaluating the local wear of dies in the plastic forming process. This paper investigated the contact load distributions and evolutions of the roller cavities in the compressor blade rolling process by the FEM. It was the first study to quantify the distributions and evolutions of the contact responses for rolling irregular components. The results indicated that the maximum contact pressure is generally present at the center of the contact interfaces, and the magnitudes of contact pressure decreased with evolution of the blade rolling process. The rolling contact interfaces can be divided into the backward slip zone, the stick zone, and the forward slip zone based on the shear stress distributions. The stick zone was a narrow belt which separated the forward and the backward slip zone, and the shear stress in the stick zone was nearly zero. The shear stress magnitudes in the forward slip zone were smaller than those in the backward slip zone, and the directions of shear stress in forward and backward slip zones were adverse. The magnitudes of shear stress over the forward and backward slip zones decreased with evolution of the blade rolling process. The distributions of local sliding were in a V-shape, the local sliding in the stick zone was nearly zero, and the bigger sliding in backward and forward slip zones was present at the boundaries of rolling entrance and exit sections. The local sliding velocity magnitudes in the backward slip zones were always bigger than those in the forward slip zones, and the magnitudes of local sliding at the rolling entrance sections were bigger than those at the rolling exit sections. In general, the local sliding velocity magnitudes increased firstly and decreased sharply at 2T/3. The current paper develops the distributions and evolutions of contact responses in the blade rolling process. The contact responses can be used for studying the wear of roller cavities to avoid the accuracy inconsistency of the shaped blade.

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“…So in the design of high performance ODS alloys, nano-Y 2 O 3 particles are generally chosen as an important dispersion phase to improve the high temperature strength, oxidation and irradiation resistance of base materials. Particularly in He embrittlement, the dispersion of nano-sized Y 2 O 3 oxide particles can increase the number of He trapping and bubble nucleation sites for transmutation helium, which inhibit the agglomeration of helium atoms into coarse bubbles, and therefore minimizes the risk of helium embrittlement in structural materials for fusion reactor applications [13][14][15]. In this condition, systematic investigations into the preparation and He behavior of ODS steels are significant and meaningful.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of He-charged ODS-FeCrNi films deposited by a radio-frequency plasma magnetron sputtering technique

Song

Wang

Zhang

et al. 2017

Plasma Sci. Technol.

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He-charged oxide dispersion strengthened (ODS) FeCrNi films were prepared by a radiofrequency (RF) plasma magnetron sputtering method in a He and Ar mixed atmosphere at 150°C. As a comparison, He-charged FeCrNi films were also fabricated at the same conditions through direct current (DC) plasma magnetron sputtering. The doping of He atoms and Y 2 O 3 in the FeCrNi films was realized by the high backscattered rate of He ions and Y 2 O 3 /FeCrNi composite target sputtering method, respectively. Inductive coupled plasma (ICP) and x-ray photoelectron spectroscopy (XPS) analysis confirmed the existence of Y 2 O 3 in FeCrNi films, and Y 2 O 3 content hardly changed with sputtering He/Ar ratio. Cross-sectional scanning electron microscopy (SEM) shows that the FeCrNi films were composed of dense columnar nanocrystallines and the thickness of the films was obviously dependent on He/Ar ratio. Nanoindentation measurements revealed that the FeCrNi films fabricated through DC/RF plasma magnetron sputtering methods exhibited similar hardness values at each He/Ar ratio, while the dispersion of Y 2 O 3 apparently increased the hardness of the films. Elastic recoil detection (ERD) showed that DC/RF magnetron sputtered FeCrNi films contained similar He amounts (∼17 at.%). Compared with the minimal change of He level with depth in DC-sputtered films, the He amount decreases gradually in depth in the RF-sputtered films. The Y 2 O 3-doped FeCrNi films were shown to exhibit much smaller amounts of He owing to the lower backscattering possibility of Y 2 O 3 and the inhibition effect of nano-sized Y 2 O 3 particles on the He element.

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Suppression effect of nano-sized oxide particles on helium irradiation hardening in F82H-ODS steel

Cited by 21 publications

References 21 publications

Effect of 0.25 and 2.0 MeV He-Ion Irradiation on Short-Range Ordering in Model (EFDA) Fe-Cr Alloys

Effect of 0.25 and 2.0 MeV He-Ion Irradiation on Short-Range Ordering in Model (EFDA) Fe-Cr Alloys

Investigating the Contact Responses of the Roller Cavity Surfaces in the Compressor Blade Rolling Process

Fabrication and characterization of He-charged ODS-FeCrNi films deposited by a radio-frequency plasma magnetron sputtering technique

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