首页|Effect of He/dpa ratio on bubble characteristics in Fe9Cr1.5W0.4Si F/M steel during irradiation and annealing
Effect of He/dpa ratio on bubble characteristics in Fe9Cr1.5W0.4Si F/M steel during irradiation and annealing
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The He production rate(i.e.,He/dpa)in nuclear reactors strongly affects the degradation of material prop-erties.This is an important but not yet fully understood issue.Here,the effect of He/dpa on bubble char-acteristics in Fe9Cr1.5W0.4Si ferrite-martensitic(F/M)steel was in situ studied during 400 keV Fe+and 30 keV He+dual-beam irradiation at 723 K with three ratios of 100,500,and 2500 appm He/dpa and subsequent stepwise annealing using transmission electron microscopy(TEM).He/dpa strongly affected the bubble characteristics.During irradiation,the higher the He/dpa,the smaller the size of irradiated bubbles,but the higher their density.However,He/dpa didn't affect the final saturation size of irradiated bubbles for all three cases,which was～2.2 nm.During annealing,high He/dpa caused large,immobile,dense polyhedral bubbles with a wider bubble size distribution,while low He/dpa caused small,low-mobility,and relatively low-density spherical bubbles.It was found that the higher the He/dpa ratio,the greater the swelling during irradiation and annealing,and annealing further enhanced the swelling.Moreover,the tunnel structure was first found in body-centered cubic(BCC)F/M steel during in-situ irra-diation.The current work provides valuable and potential insights for further understanding the He/dpa effects in materials serving in different nuclear reactors.
He effectFerritic-martensitic steelHe bubbleIon irradiationAnnealing
Dewang Cui、Kefei Pei、Ziqi Cao、Yipeng Li、Yifan Ding、Yuanming Li、Shichao Liu、Guang Ran
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College of Energy,Xiamen University,Xiamen,361102,China
Fujian Provincial Nuclear Energy Engineering Technology Research Center,Xiamen,361102,China
College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,361005,China
Science and Technology on Reactor System Design Technology Laboratory,Chengdu,610213,China
Nuclear Power Institute of China,Chengdu,610213,China
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National Natural Science Foundation of ChinaNational Science Fund for Distinguished Young Scholars of China
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