Effects of residual stress on irradiation hardening in stainless steels

Okubo, Nariaki; Miwa, Yukio; Kondo, Keietsu; Kaji, Yoshiyuki

doi:10.1016/j.jnucmat.2008.12.116

Cited by 3 publications

(2 citation statements)

References 7 publications

(6 reference statements)

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“…Irradiation hardening is observed in all the cases irrespective of final treatment conditions. It is of notice that in ODS steel, irradiation hardening is observed after the irradiation at 470 °C, while in the conventional (non-ODS) steels it was not observed when the irradiation temperature was higher than 420 °C [11][12][13][14][15] because of the mutual annihilation between interstitial type dislocation loops (I-loops) and vacancies decomposed from vacancy clusters.…”

Section: Methodsmentioning

confidence: 99%

Effect of recrystallization on ion-irradiation hardening and microstructural changes in 15Cr-ODS steel

Kimura

2015

Nuclear Instruments and Methods in Physics Research Section B:

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The effects of recrystallization on ion-irradiation hardening and microstructural changes were investigated for a 15Cr-ODS ferritic steel. Dual ion-irradiation experiments were performed at 470 °C using 6.4 MeV Fe 3+ ions simultaneously with energy-degraded 1 MeV He + ions. The displacement of damage at 600 nm depth from the specimen surface was 30 dpa. Nano-indentation test with Berkovich type indentation tip was measured by constant stiffness measurement (CSM) technique. Results from nano-indentation tests indicate irradiation hardening in ODS steels even at 470°C, while it wasn't observed in reduced activation ferritic steel. Recrystallized ODS steel shows a larger irradiation hardening, which is considered to be due to the reduction of grain boundaries and interfaces of matrix/oxide particles. In 20 % cold rolled ODS steel after recrystallization, both the hardening and bubble number density were lower than those of recrystallized ODS steel, suggesting that dislocations generated by cold rolling suppress bubble formation. Based on the estimation of irradiation hardening from TEM observation results, it is considered that the bubbles are not the main factor controlling ion-irradiation hardening.

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Section: Methodsmentioning

confidence: 99%

Effect of recrystallization on ion-irradiation hardening and microstructural changes in 15Cr-ODS steel

Kimura

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…These effects will substantially undermine the safety of the in-pile materials within the dispersion nuclear fuel element. As a result, in order to predict the life time of the dispersion fuel element and implement the optimal design, it is necessary to evaluate and simulate the synergistic effects of irradiation hardening with other irradiation behaviors [15].…”

Section: Introductionmentioning

confidence: 99%