Mechanical property changes induced in structural alloys by neutron irradiations with different helium to displacement ratios

Mansur, L.K.; Grossbeck, M.L.

doi:10.1016/0022-3115(88)90235-8

Cited by 86 publications

(31 citation statements)

References 29 publications

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“…Recently, the effect of helium production on radiation hardening has been examined and large enhancement of hardening due to helium from 600 to 5000 appm was detected in tensile tests on 9Cr martensitic steels EM10 and T91 implanted by cyclotron experiments. 14,15) Slight enhancement of radiation hardening was also reported in neutron irradiation experiments 16,17) and other ion beam experiments. 18,19) In the other cyclotron experiments, 20,21) the enhancement of radiation hardening due to helium production was hardly observed up to 600 appm He.…”

Section: Introductionmentioning

confidence: 57%

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: 57%

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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“…Recently, the effect of helium production on radiation hardening has been examining and the large enhancement of hardening due to helium from 600 appm to 10000 appm is detected in the tensile testing for 9Cr martensitic steels EM10 and T91 implanted by cyclotron experiments. 7) Small enhancements of radiation hardening due to helium are also reported in neutron irradiation experiment 8,9) and ion beam experiments. 10) In order to examine the quantified analysis for the dependence of helium production on hardening, isotope 10 B dope technique to produce He atom in the alloys with a different 10 B concentration is effective method under a mixed spectrum reactor irradiation with thermal and first neutrons.…”

Section: Introductionmentioning

confidence: 65%

Mechanical Property of F82H Steel Doped with Boron and Nitrogen

Wakai¹,

Matsukawa²,

Yamamoto³

et al. 2004

Mater. Trans.

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Dependence of fracture properties and hardening was examined as a function of helium production in tensile specimens of a martensitic steel F82H (Fe-8Cr-2W-0.1C-0.04Ta) irradiated at 300 C to 2.3 dpa by neutron irradiation in the JMTR (Japan Materials Testing Reactor). The specimens used in this study were F82H, F82H+60 ppm 11 B, F82H+30 ppm ( 11 B+ 10 B) and F82H+60 ppm 10 B. The helium range produced from 10 B (n,) 7 Li reaction was from 5 to 330 appm in the specimens. The tensile testing was performed at 25 C. The radiation hardening due to helium production was detected at 330 appmHe. The degradation of fracture stress due to helium production was approximately evaluated from the fracture strength and the reduction area. Effect of specimen size on tensile and Charpy impact properties in F82H doped with 60 ppm boron and 200 ppm nitrogen was also examined. The JIS 14A and SS-J3 (Small Size-Japanese-3 type) were used for the tensile specimens, and half size (55 mm in length, 10 mm in height and 5 mm in width) and 0.5-1/3CVN (18 mm in length, 3.3 mm in height and 1.65 mm in width) were used for the Charpy impact testing. The tensile properties were a similar to each other. However, the ductile-brittle transition temperature measured in smaller size specimen was somewhat lower than that in the standard size specimen.

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“…High temperature helium embrittlement has been known and examined for some time [19][20][21]. The conventional view is that He-embrittlement is a high temperature phenomenon for temperatures over half the melting point.…”

Section: Helium Effects/embrittlementmentioning

confidence: 99%

Critical questions in materials science and engineering for successful development of fusion power

Bloom

Busby

Duty

et al. 2007

Journal of Nuclear Materials

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Mechanical property changes induced in structural alloys by neutron irradiations with different helium to displacement ratios

Cited by 86 publications

References 29 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

Mechanical Property of F82H Steel Doped with Boron and Nitrogen

Critical questions in materials science and engineering for successful development of fusion power

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