Synergistic effect of helium and hydrogen for bubble swelling in reduced-activation ferritic/martensitic steel under sequential helium and hydrogen irradiation at different temperatures

Hu, Wenhui; Guo, Liping; Chen, Jihong; Luo, Fengfeng; Li, Tiecheng; Ren, Yaoyao; Suo, Jinping; Yang, Feng

doi:10.1016/j.fusengdes.2014.02.033

Cited by 38 publications

(14 citation statements)

References 26 publications

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“…Wakai et al [ 28 ] argued that swelling in ferritic/martensitic steels is significantly enhanced by the synergistic effect of Fe irradiation- induced damage, hydrogen and helium atoms. Similarly, Hu et al [ 29 ] reported synergistic effect of helium and hydrogen for bubble swelling in ferritic/martensitic steel, and also argued the increasing irradiation swelling of ferritic/martensitic steel after helium and hydrogen implantation. Marian et al [ 30 ] regarded that the synergistic effect of hydrogen-helium depends on irradiation temperature.…”

Section: Resultsmentioning

confidence: 89%

Comparison between Subsequent Irradiation and Co-Irradiation into SIMP Steel

et al. 2021

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A modern Chinese ferritic/martensitic steel SIMP, is a new perspective nuclear structural material for the spallation target in accelerator driven sub-critical system. In this work, aimed at exploring the radiation resistance properties of this material, we investigate the differences between simultaneous Fe and He ions irradiation and He implantation of SIMP steel pre-irradiated by Fe self-ions. The irradiations were performed at 300 °C. The radiation-induced hardening was evaluated by nano-indentation, while the lattice disorder was investigated by transmission electron microscopy. Clear differences were found in the material microstructure after the two kinds of the ion irradiation performed. Helium cavities were observed in the co-irradiated SIMP steel, but not the case of He implantation with Fe pre-irradiation. In the same time, the size and density of Frank loops were different in the two different irradiation conditions. The reason for the different observed lattice disorders is discussed.

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Section: Resultsmentioning

confidence: 89%

Comparison between Subsequent Irradiation and Co-Irradiation into SIMP Steel

et al. 2021

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“…The amount of helium dissociated from He n V m (n/m ≈ 1.3) clusters in S6 was also slightly larger. It meant that the formation and growth of He n V m (n/m > 1.3) clusters was suppressed, while those of He n V m (n/m ≈ 1.3) clusters and helium bubbles were both enhanced when the irradiation temperature changed from 523 K to 723 K. In our previous study, RAFM steels were irradiated with He + to 1.6 × 10 20 m −2 at 523 K and 723 K and examined with TEM [ 15 ]. Bubbles were observed in the specimen irradiated at 723 K; in contrast, no bubbles were observed in the specimen irradiated at 523 K. This is coincident with the results in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Many calculation studies based on first-principle calculation [ 7 , 8 , 9 ], modular dynamics [ 10 ], and kinetic Monte-Carlo [ 11 , 12 ] reported results about the stability and mobility of He–V clusters in α-Fe. Some experiments using transmission electron microscopy (TEM) studied helium bubbles’ behavior in RAFM steels [ 13 , 14 , 15 ]. However, owing to the limit of the resolution power of TEM on helium, observation of small defects and defect clusters containing both helium atoms and vacancies is beyond its ability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Helium Behavior in RAFM Steel by Positron Annihilation Doppler Broadening and Thermal Desorption Spectroscopy

et al. 2018

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The behavior of helium in reduced-activation ferritic/martensitic steels was investigated systematically with positron annihilation Doppler broadening measurement and thermal desorption spectroscopy. Specimens were irradiated with helium ions with different energies to various fluences at different temperatures. A threshold fluence was observed above which the rate of formation and growth of helium bubbles dramatically increased. Irradiation at higher temperature could suppress the formation and growth of HenVm clusters with low binding energies and enhance that of helium bubbles and HenVm clusters with high binding energies. Different changes of S parameters were observed in various depth after the irradiation temperature was increased from 523 K to 723 K. Irradiation of 18 keV-He+ enhanced the growth of HenVm clusters and helium bubbles compared with 100 keV-He+ irradiation. A possible mechanism is discussed.

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“…As a result, the newly produced vacancies induced by H irradiation were trapped by He-V complexes or He clusters. Hydrogen may be trapped by He-V clusters, or He clusters or very small helium bubble seed to help bubble nucleation [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Annealing on Microstructures and Hardening of Helium-Hydrogen-Implanted Sequentially Vanadium Alloys

Jiang

Wang

2018

Nanoscale Res Lett

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The effect of post-irradiation annealing on the microstructures and mechanical properties of V-4Cr-4Ti alloys was studied. Helium-hydrogen-irradiated sequentially V-4Cr-4Ti alloys at room temperature (RT) were undergone post-irradiation annealing at 450 °C over periods of up to 30 h. These samples were carried out by high-resolution transmission electron microscopy (HRTEM) observation and nanoindentation test. With the holding time, large amounts of point defects produced during irradiation at RT accumulated into large dislocation loops and then dislocation nets which promoted the irradiation hardening. Meanwhile, bubbles appeared. As annealing time extended, these bubbles grew up and merged, and finally broke up. In the process, the size of bubbles increased and the number density decreased. Microstructural changes due to post-irradiation annealing corresponded to the change of hardening. Dislocations and bubbles are co-contributed to irradiation hardening. With the holding time up to 30 h, the recovery of hardening is not obvious. The phenomenon was discussed by dispersed barrier hardening model and Friedel-Kroupa-Hirsch relationship.

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Synergistic effect of helium and hydrogen for bubble swelling in reduced-activation ferritic/martensitic steel under sequential helium and hydrogen irradiation at different temperatures

Cited by 38 publications

References 26 publications

Comparison between Subsequent Irradiation and Co-Irradiation into SIMP Steel

Comparison between Subsequent Irradiation and Co-Irradiation into SIMP Steel

Investigation of Helium Behavior in RAFM Steel by Positron Annihilation Doppler Broadening and Thermal Desorption Spectroscopy

Effect of Annealing on Microstructures and Hardening of Helium-Hydrogen-Implanted Sequentially Vanadium Alloys

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