Effect of He/dpa ratio on bubble characteristics in Fe9Cr1.5W0.4Si F/M steel during irradiation and annealing

作     者：Dewang Cui Kefei Pei Ziqi Cao Yipeng Li Yifan Ding Yuanming Li Shichao Liu Guang Ran Dewang Cui;Kefei Pei;Ziqi Cao;Yipeng Li;Yifan Ding;Yuanming Li;Shichao Liu;Guang Ran

作者机构：College of EnergyXiamen UniversityXiamen361102China Science and Technology on Reactor System Design Technology LaboratoryChengdu610213China College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Fujian Provincial Nuclear Energy Engineering Technology Research CenterXiamen361102China Nuclear Power Institute of ChinaChengdu610213China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术(英文版))

年 卷 期：2024年第197卷第30期

页      面：17-24页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foun-dation of China(No.U1967211) the National Science Fund for Distinguished Young Scholars of China(No.12225506) 

主　　题：He effect Ferritic-martensitic steel He bubble Ion irradiation Annealing 

摘      要：The He production rate(i.e.,He/dpa)in nuclear reactors strongly affects the degradation of material *** is an important but not yet fully understood ***,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 *** irradiation,the higher the He/dpa,the smaller the size of irradiated bubbles,but the higher their ***,He/dpa didn’t affect the final saturation size of irradiated bubbles for all three cases,which was-2.2 *** 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 *** was found that the higher the He/dpa ratio,the greater the swelling during irradiation and annealing,and annealing further enhanced the ***,the tunnel structure was first found in body-centered cubic(BCC)F/M steel during in-situ *** current work provides valuable and potential insights for further understanding the He/dpa effects in materials serving in different nuclear reactors.