Irradiation hardening of ODS ferritic steels under helium implantation and heavy-ion irradiation

Heng-qing, Zhang; Zhang, Chonghong; Yang, Yitao; Meng, Yu; Jang, Jinsung; Kimura, Akihiko

doi:10.1016/j.jnucmat.2014.06.062

Cited by 44 publications

(14 citation statements)

References 25 publications

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“…However, fine bubbles were observed to homogeneously distribute in the sample irradiated at 700 • C, as shown in Figure 4e. It has been confirmed that high-density helium bubbles could act as obstacles to dislocation motion leading to hardening [41,42]. Therefore, the irradiation-induced hardening in the irradiated P92 steel at 700 • C can result from the formation of uniformly distributed Ar bubbles with a high number density and fine size.…”

Section: Discussionmentioning

confidence: 95%

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Liu

Shen

Zhu³

et al. 2018

Metals

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P92 steel was irradiated with Ar ion up to 10 dpa at 200, 400, and 700 • C. The effect of Ar ion irradiation on hardness was investigated with nanoindentation tests and microstructure analyses. It was observed that irradiation-induced hardening occurred in the steel after Ar ion irradiation at all three temperatures to 10 dpa. The steel exhibited significant hardening at 200 and 700 • C, and slight hardening at 400 • C under Ar ion irradiation. Difference in the magnitude of irradiation-induced hardening at different temperature in the steel is attributed to different changes in the microstructure of the steel that arose from the irradiation. Irradiation-induced hardening in the P92 steel irradiated at 200 • C is attributed to the occurrence of both dislocation loops and other fine irradiation defects during irradiation. Slight hardening in the steel irradiated at 400 • C mainly arises from the annihilation of defect clusters at this temperature. The occurrence of fine Ar bubbles with high number density during the Ar ion irradiation at 700 • C resulted in the significant hardening in the steel.

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Section: Discussionmentioning

confidence: 95%

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Liu

Shen

Zhu³

et al. 2018

Metals

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“…The dose dependence of the maximum nano-hardness in Figure 7a is similar to that of the characteristic length l* as shown in Figure 6 which demonstrates a rapid increase at low doses and a slowdown of the rate of increase at higher doses, implying that the irradiation effect on nano-hardness would become saturated eventually after high dosage. Zhang et al [3] proposed a power-law dependence of the nano-hardness on dpa. In this work, the maximum nano-hardness From Equation (2) it could be found that the slope of the second line just after the inflection point of the bilinear curves in Figure 5b is equal to H 0 2 × l*.…”

Section: Nano-hardnessmentioning

confidence: 99%

“…Instead, high-energy heavy ion irradiation has been extensively used to study the irradiation response of the candidate RPV steel because of the simplicity of use, easier control of irradiation parameters, reduction of cost, rapid damage production, and absence of induced radioactivity [3][4][5][6]. Ion irradiation is one of the best methods for investigation of irradiation embrittlement [7], and provides a rapid and flexible way to achieve high doses without the hazards induced by activation of the materials [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel

Bai

Liaw

et al. 2017

Metals

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Specimens of the SA508-IV reactor pressure vessel (RPV) steel, containing 3.26 wt. % Ni and just 0.041 wt. % Cu, were irradiated at 290 • C to different displacement per atom (dpa) with 3.5 MeV Fe ions (Fe 2+ ). Microstructure observation and nano-indentation hardness measurements were carried out. The Continuous Stiffness Measurement (CSM) of nano-indentation was used to obtain the indentation depth profile of nano-hardness. The curves showed a maximum nano-hardness and a plateau damage near the surface of the irradiated samples, attributed to different hardening mechanisms. The Nix-Gao model was employed to analyze the nano-indentation test results. It was found that the curves of nano-hardness versus the reciprocal of indentation depth are bilinear. The nano-hardness value corresponding to the inflection point of the bilinear curve may be used as a parameter to describe the ion irradiation effect. The obvious entanglement of the dislocations was observed in the 30 dpa sample. The maximum nano-hardness values show a good linear relationship with the square root of the dpa.

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“…Boron or nickel-containing steels exposed to neutron irradiation have been used to investigate the microstructural evolution and mechanical property changes of materials under simultaneous irradiation damage and He production [29] [30] [31]. Ion irradiation as a surrogate for neutron irradiation and simultaneous He injection have been used to study the He effects in pure Fe or steels [8] [32,33]. The most studied case is the He implantation on Fe or steels to investigate the near-surface microstructure evolution and the He-defect interactions [26] [34] [27].…”

Section: Introductionmentioning

confidence: 99%

Impact of neutron irradiation on thermal helium desorption from iron

Field

Taller

et al. 2017

Journal of Nuclear Materials

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The synergistic effect of neutron irradiation and transmutant helium production is an important concern for the application of iron-based alloys as structural materials in fission and fusion reactors. In this study, we investigated the impact of neutron irradiation on thermal helium desorption behavior in high purity iron. Single crystalline and polycrystalline iron samples were neutron irradiated in HFIR to 5 dpa at 300°C and in BOR-60 to 16.6 dpa at 386°C, respectively. Following neutron irradiation, 10 keV He ion implantation was performed at room temperature on both samples to a fluence of 7×10 18 He/m 2. Thermal desorption spectrometry (TDS) was conducted to assess the helium diffusion and clustering kinetics by analyzing the desorption spectra. The comparison of He desorption spectra between unirradiated and neutron irradiated samples showed that the major He desorption peaks shift to higher temperatures for the neutron-irradiated iron samples, implying that strong trapping sites for He were produced during neutron irradiation, which appeared to be nm-sized cavities through TEM examination. The underlying mechanisms controlling the helium trapping and desorption behavior were deduced by assessing changes in the microstructure, as characterized by TEM, of the neutron irradiated samples before and after TDS measurements.

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Irradiation hardening of ODS ferritic steels under helium implantation and heavy-ion irradiation

Cited by 44 publications

References 25 publications

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Evaluation of Irradiation Hardening of P92 Steel under Ar Ion Irradiation

Effect of Heavy Ion Irradiation Dosage on the Hardness of SA508-IV Reactor Pressure Vessel Steel

Impact of neutron irradiation on thermal helium desorption from iron

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