Effect of triple ion beams in ferritic/martensitic steel on swelling behavior

Wakai, Eiichi; Sawai, Tetsuo; Furuya, Kazuo; Naito, A.; Aruga, Tetsuya; Kikuchi, Kenji; Yamashita, Shohei; Ohnuki, S.; Yamamoto, Seiji; Naramoto, H.; Jistukawa, S

doi:10.1016/s0022-3115(02)01076-0

Cited by 74 publications

(53 citation statements)

References 17 publications

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“…Radiation-induced degradation of fracture toughness related to helium production is recognized to be one of the critical issues of the alloys. Futhermore, the synergistic effects of helium, hydrogen and displacement damage have been reported for swelling behavior [22][23][24] and mechanical properties, [25][26][27][28][29][30][31] and the synergistic effect has been another ongoing concern.…”

Section: Introductionmentioning

confidence: 99%

“…Radiation hardening is induced by the formation of defect clusters, and it can be evaluated by Orowan's theory for athermal bowing of dislocations around obstacles on a slip plane. 38,39) The formation and growth of defect clusters depends on irradiation parameters such as temperature, dpa, dpa rate and helium production rate, 18,22,23,40,41) and the microstructures of the irradiated F82H+ 10 B, F82H+ 11 B, and F82H+…”

Section: Introductionmentioning

confidence: 99%

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Effects of Helium Production and Heat Treatment on Neutron Irradiation Hardening of F82H Steels Irradiated with Neutrons

Wakai¹,

Taguchi²,

Yamamoto³

et al. 2005

Mater. Trans.

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The influcence of addition of 10 B and 11 B on radiation hardening as a function of irradiation temperature was examined in reducedactivation martensitic F82H+B steels (8Cr-2W-0.2V-0.04Ta-0.1C-0.006B). Specimens used were 10 B doped, 10 B+ 11 B doped and 11 B doped F82H steels. Helium concentration produced in the specimens through 10 B(n, ) 7 Li reaction was measured from about 15 to about 330 appm. Radiation hardening of the specimens irradiated at 300 C to 2.3 dpa and 150 C to 1.9 dpa was observed. Increment of radiation hardening possibly due to helium in the specimen irradiated at 300 C tended to increase slightly with increasing helium production in tensile test at 20 C, but it was not observed for 150 C irradiation. Therefore, it can be mentioned that the enhancement of radiation hardening in the 10 B( 11 B) doped steels depends on irradiation temperature. The dependence of radiation hardening on tempering time was also examined for F82H-std irradiated at 150 C to 1.9 dpa. Increment of yield strength of F82H-std tended to increase with increasing tempering time. The relation between the shift of DBTT and the increment of yield strength due to irradiation suggest that the extension of tempering time or the increase of tempering temperature would be beneficial for mechanical properties of F82H-std.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Helium Production and Heat Treatment on Neutron Irradiation Hardening of F82H Steels Irradiated with Neutrons

Wakai¹,

Taguchi²,

Yamamoto³

et al. 2005

Mater. Trans.

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“…4, the enhancement of irradiation hardening due to co-implantation of hydrogen and helium atoms was found. In previous studies 2,3) of swelling behaviors by triple and dual ion beams to 50 dpa, the dislocation densities were similar to each other, and the sizes and number densities of cavities depended on the ratios of He/dpa and H/ dpa for ion irradiation conditions. Hydrogen atoms enhanced the growth of cavities during triple ion irradiations.…”

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confidence: 58%

“…The changes of mechanical properties are intimately related with the microstructural evolutions such as the formation and growth of defect clusters, which is easily affected by the existence of helium atoms. The effects of helium production as a function of displacement damage and heat treatment on swelling behavior of F82H steel by neutron irradiation at 300 and 400 C were reported, 1) and the synergistic effects of displacement damage helium and hydrogen on swelling behavior at 470-600 C [2][3][4][5] and irradiation hardening 6) at 270 C and 360 C of F82H steel by ion irradiation were also reported. These results showed that the production of gaseous atoms enhanced the swelling and hardness of the F82H steel, and the non-tempered treatment for the F82H steel remarkably suppressed the swelling.…”

Section: Introductionmentioning

confidence: 96%

Effect of Helium and Hydrogen Production on Irradiation Hardening of F82H Steel Irradiated by Ion Beams

et al. 2007

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Effects of helium and hydrogen production on irradiation hardening of martensitic steel F82H (Fe-8Cr-2W-0.2V-0.04Ta-0.1C) were examined by dual or triple beam experiments. The effects of tempering and cold working were also examined. The irradiations were performed at about 500 C to 50 dpa under simultaneous dual beams of 10.5 MeV Fe 3þ and 1.05 MeV He þ or triple beams of those and 380 keV H þ ions. The value of appm-He/dpa for the dual ion beams was about 15, and the values of appm-He/dpa and appm-H/dpa for the triple ion beams were 15 and 15 (or 150), respectively. The hardness of the irradiated specimens measured at room temperature using a micro indentation after the irradiations. Irradiation softening and hardening was observed in F82H-std, F82H+20%CW and a non-tempered F82H steels irradiated at about 500 C to 18 and 50 dpa, respectively, by dual ion beams. The hardness of the specimens irradiated at about 500 C to 18 dpa under triple ion beams was harder than that under dual ion beams.

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“…Two recent papers [1,2] investigate the synergistic effect of displacement damage, helium and hydrogen production on swelling of ferritic/martensitic steels.…”

Section: Introductionmentioning

confidence: 99%

Foreign Trip Report MATGEN-IV Sep 24- Oct 26, 2007

Caro¹

2007

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• Coming back from a NATO School on Generation IV reactors, here is a summary of the significant effort and major interest on ODS for cladding applications.• This document also reports on the contacts established to obtain ODS from different sources to start our own experimental program at LLNL. IntroductionThe identification and development of the new structural materials is recognized as a technological challenge for Generation-IV nuclear reactors. Oxide dispersion strengthened ferritic-martensitic (F/M) steels (ODS) have raised considerable interest in nuclear applications. They provide irradiation swelling resistance and enhanced high-temperature strength. The hightemperature creep strength of these alloys is exceptional, i.e., at 650°C it can be three to four times larger than for the traditional F/M steel HT-9 [http://nuclear.inl.gov/deliverables/docs/intg-matls-plan.pdf].

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Effect of triple ion beams in ferritic/martensitic steel on swelling behavior

Cited by 74 publications

References 17 publications

Effects of Helium Production and Heat Treatment on Neutron Irradiation Hardening of F82H Steels Irradiated with Neutrons

Effects of Helium Production and Heat Treatment on Neutron Irradiation Hardening of F82H Steels Irradiated with Neutrons

Effect of Helium and Hydrogen Production on Irradiation Hardening of F82H Steel Irradiated by Ion Beams

Foreign Trip Report MATGEN-IV Sep 24- Oct 26, 2007

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